diff --git a/Addition.c b/Addition.c
new file mode 100644
index 00000000..3ba5312b
--- /dev/null
+++ b/Addition.c
@@ -0,0 +1,15 @@
+#include<stdio.h>
+
+int main()
+
+{
+int num1,num2,addition;
+printf("enter the num1");
+scanf("%d",&num1);
+printf("enter the num2");
+scanf("%d",&num2);
+addition= num1+num2;
+printf ("%d",addition);
+return 0 ;
+
+}
\ No newline at end of file
diff --git a/Area of circle.c b/Area of circle.c
new file mode 100644
index 00000000..d1ea1fed
--- /dev/null
+++ b/Area of circle.c	
@@ -0,0 +1,12 @@
+#include<stdio.h>
+
+int main()
+{
+float r,pie=3.14,area;
+printf("enter the radius ");
+scanf("%f",&r);
+area=pie*r*r;
+printf("area of the circle is %f",area);
+
+return 0;
+}
\ No newline at end of file
diff --git a/Calculator.c b/Calculator.c
new file mode 100644
index 00000000..56c9d435
--- /dev/null
+++ b/Calculator.c
@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <math.h>
+#include <conio.h>
+
+int main()
+{
+    int a, b;
+    int sum, sub, mult, mod;
+    float div;
+    printf("enter the value of a ");
+    scanf("%d", &a);
+    printf("enter the value of b");
+    scanf("%d", &b);
+    sum = a + b;
+    printf("\n add=%d", sum);
+    sub = a - b;
+    printf("\n sub=%d", sub);
+    mult = a * b;
+    printf("\n mul=%d", mult);
+    div = (a)/(b);
+    printf("\n div=%f", div);   
+    mod = a % b;
+    printf("\n mod=%d", mod);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/Check_Prime_number.c b/Check_Prime_number.c
new file mode 100644
index 00000000..a482c916
--- /dev/null
+++ b/Check_Prime_number.c
@@ -0,0 +1,14 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int n, i;
+    printf("enter a number ");
+    scanf("%d",& n);
+    for (i = 2; i <= n; i++)
+    {
+        n % i != 0 ? printf("it is a prime number") : printf("it is a prime number");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/Convert celsius to fahrenheit.c b/Convert celsius to fahrenheit.c
new file mode 100644
index 00000000..66317e9a
--- /dev/null
+++ b/Convert celsius to fahrenheit.c	
@@ -0,0 +1,12 @@
+#include<stdio.h>
+
+int main()
+{
+float fare,cels;
+printf("Enter the temperature in fahrenheit");
+scanf("fahrenheit=%f",&fare);
+cels=(fare - 32)*0.5;
+printf("the temperature in celsius is %f",cels);
+
+return 0;
+}
diff --git a/Example of pointer.c b/Example of pointer.c
new file mode 100644
index 00000000..efec358a
--- /dev/null
+++ b/Example of pointer.c	
@@ -0,0 +1,15 @@
+#include<stdio.h>
+
+int main()
+{
+int age=18;
+int*ptr=&age;
+int _age=*ptr;
+printf("  age %d",age);
+printf("\n *ptr %d",*ptr);
+printf("\n _age %d",_age);
+
+return 0;
+
+
+}
\ No newline at end of file
diff --git a/Find factorial.c b/Find factorial.c
new file mode 100644
index 00000000..5e2b53ed
--- /dev/null
+++ b/Find factorial.c	
@@ -0,0 +1,41 @@
+#include<stdio.h>
+
+int factorial(int n);
+
+int main()
+{
+    
+    int n,fact,i;
+    printf("enter the number ");
+    scanf("%d",&n);
+    printf("factorial is %d",factorial(n));
+    return 0;
+
+}
+
+int factorial(int n)
+   {
+  if(n==0)
+  {
+    return 1;
+  }
+  
+  int factnm1=factorial(n-1);
+  int factn=factnm1 * n ;
+  return factn;
+  
+   }
+  
+  
+  
+  
+     /*  int i,n,fact;
+   for(i=0;i<=n;i++)
+   {
+       fact=n*i;
+       printf("%d",fact);
+
+        return fact;
+   }*/
+   
+   
\ No newline at end of file
diff --git a/Find no is pos or neg.c b/Find no is pos or neg.c
new file mode 100644
index 00000000..51c9eae9
--- /dev/null
+++ b/Find no is pos or neg.c	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+int num;
+printf("enter the num");
+scanf("%d",&num);
+if(num>0)
+{
+    printf("the given number is positive");
+}
+else
+{
+printf("the given number is negative");
+}
+return 0 ;
+}
\ No newline at end of file
diff --git a/Find out max no.c b/Find out max no.c
new file mode 100644
index 00000000..68a354dc
--- /dev/null
+++ b/Find out max no.c	
@@ -0,0 +1,19 @@
+#include<stdio.h>
+
+int main()
+{
+int a,b;                        
+printf("enter the value of a ");
+scanf("%d",&a);
+printf("entefr the  value of b");
+scanf("%d",&b);
+if(a>b)
+{
+printf("a is greater than b");
+else
+{
+printf("b is greater than a");
+}
+}
+return 0;
+}
\ No newline at end of file
diff --git a/Given_number_is_prime_or_not.c b/Given_number_is_prime_or_not.c
new file mode 100644
index 00000000..87dae3bc
--- /dev/null
+++ b/Given_number_is_prime_or_not.c
@@ -0,0 +1,30 @@
+#include <stdio.h>
+
+int main() {
+
+  int n, i, flag = 0;
+  printf("Enter a positive integer: ");
+  scanf("%d", &n);
+
+  // 0 and 1 are not prime numbers
+  // change flag to 1 for non-prime number
+  if (n == 0 || n == 1)
+    flag = 1;
+
+  for (i = 2; i <= n / 2; ++i) {
+
+    
+    if (n % i == 0) {
+      flag = 1;
+      break;
+    }
+  }
+
+  
+  if (flag == 0)
+    printf("%d is a prime number.", n);
+  else
+    printf("%d is not a prime number.", n);
+
+  return 0;
+}
\ No newline at end of file
diff --git a/Print a number from negative to positive - Copy.c b/Print a number from negative to positive - Copy.c
new file mode 100644
index 00000000..cac0a9c0
--- /dev/null
+++ b/Print a number from negative to positive - Copy.c	
@@ -0,0 +1,14 @@
+#include<stdio.h>
+ 
+int main()
+{
+    int n,low;
+    scanf("%d",&n);
+    low=-n; 
+    while(low<=n)
+    {
+        printf("%d",low);
+        low++;
+    }
+    
+}
\ No newline at end of file
diff --git a/Reverse a number - Copy.c b/Reverse a number - Copy.c
new file mode 100644
index 00000000..9fd94fdb
--- /dev/null
+++ b/Reverse a number - Copy.c	
@@ -0,0 +1,16 @@
+#include<stdio.h>
+
+int main()
+{
+int no,rem,rev=0;
+printf("enter a number");
+scanf("%d",&no);
+while(no!=0)
+{
+rem=no%10;
+rev=rev*10+rem;
+no=no/10;
+}
+printf("%d",rev);
+return 0;
+}
\ No newline at end of file
diff --git a/SQUARE ROOT BY GOTO - Copy.c b/SQUARE ROOT BY GOTO - Copy.c
new file mode 100644
index 00000000..8869dcd6
--- /dev/null
+++ b/SQUARE ROOT BY GOTO - Copy.c	
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+    int i=0;
+    float ans,n;
+    s:
+    printf(" enter the number:- ");
+    scanf("%f", &n);
+    ans = sqrt(n);
+    printf("square root of %f is %0.1f \n",n,ans);
+    i++;
+    if (i <= 5)
+    {
+        goto s;
+    }
+    else
+    {
+        printf("you reach max limit");
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/Solve polynomial equation - Copy.c b/Solve polynomial equation - Copy.c
new file mode 100644
index 00000000..7ad3df5e
--- /dev/null
+++ b/Solve polynomial equation - Copy.c	
@@ -0,0 +1,11 @@
+#include<stdio.h>
+
+int main()
+{
+    int x,a;
+    printf("enter the value of x");
+    scanf("%d",&x);
+    a=4*x*x*x-5*x+9;
+    printf("the answer of polynomial equation is %d",a);
+    return 0;
+}
\ No newline at end of file
diff --git a/Sum and Avg of 10 numbers - Copy.c b/Sum and Avg of 10 numbers - Copy.c
new file mode 100644
index 00000000..8c2b6712
--- /dev/null
+++ b/Sum and Avg of 10 numbers - Copy.c	
@@ -0,0 +1,19 @@
+#include<stdio.h>
+
+int main()
+{
+int num,sum=0,i;
+float avg;
+printf("enter the 10 number:");
+for(i=1;i<=10;i++)
+{
+    printf("%d",i);
+    scanf("%d",&num);
+    sum =sum + num;
+}
+    avg=sum/10;
+    printf("sum of  the given numbers= %d",sum);
+   \n printf("\n avg of the given numbers= %f",\n avg);
+return 0;
+
+}
\ No newline at end of file
diff --git a/Sum of 2 no by pointers - Copy.c b/Sum of 2 no by pointers - Copy.c
new file mode 100644
index 00000000..a88da247
--- /dev/null
+++ b/Sum of 2 no by pointers - Copy.c	
@@ -0,0 +1,19 @@
+
+
+#include<stdio.h>
+
+int main()
+
+{
+int a , b , *ptr , *qtr, sum;
+printf("enter the value of a");
+scanf("%d",&a);
+printf("enter the value of b");
+scanf("%d",&b);
+ptr=&a;
+qtr=&b;
+sum= *ptr + *qtr;
+printf("%d",sum);
+
+return 0;
+}
\ No newline at end of file
diff --git a/Sum of square and cube upto any given number - Copy.c b/Sum of square and cube upto any given number - Copy.c
new file mode 100644
index 00000000..cf8cb2b4
--- /dev/null
+++ b/Sum of square and cube upto any given number - Copy.c	
@@ -0,0 +1,20 @@
+#include<stdio.h>
+
+int main()
+{
+int no,i=1,square,cube,sum_of_square=0,sum_of_cube=0;
+printf("enter a number");
+scanf("%d",&no);
+while(i<=no)
+{
+   square=i*i;
+   cube=i*i*i;
+   sum_of_square=sum_of_square+square;
+   sum_of_cube=sum_of_cube+cube;
+   i++;
+}
+printf(" sum of square %d of natural numbers id %d",no,sum_of_square);
+printf("\n  sum of cube %d of natural numbers id %d",no,sum_of_cube);
+
+return 0;
+}
\ No newline at end of file
diff --git a/Sum upto given numbers - Copy.c b/Sum upto given numbers - Copy.c
new file mode 100644
index 00000000..b5eafb6f
--- /dev/null
+++ b/Sum upto given numbers - Copy.c	
@@ -0,0 +1,15 @@
+#include<stdio.h>
+
+int main()
+{
+int no,i,sum=0;
+printf("enter the number");
+scanf("%d",&no);
+for(i=1;i<=no;i++)
+{
+printf("%d",i);
+sum+=i;
+}
+printf("\n%d",sum);
+return 0;
+}
\ No newline at end of file
diff --git a/Table - Copy.c b/Table - Copy.c
new file mode 100644
index 00000000..05d20ee6
--- /dev/null
+++ b/Table - Copy.c	
@@ -0,0 +1,13 @@
+#include<stdio.h>
+
+int main()
+{
+int i,n ;
+    printf("enter a number");
+    scanf("%d", &n);
+    for(i=1;i<=10;i++)
+    {
+    printf("%d * %d = %d\n",n,i,(n*i));
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/armstrong number.c b/armstrong number.c
new file mode 100644
index 00000000..c6b7c07a
--- /dev/null
+++ b/armstrong number.c	
@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main()
+{
+    int num, remainder, armstrongnumber, p = 0;
+    printf("enter a number");
+    scanf("%d", &num);
+    while (num != 0)
+    {
+        remainder = num % 10;
+        p += (remainder * remainder * remainder);
+        num /= 10;
+    }
+    printf("%d", p);
+    if (num = p)
+    {
+        printf(" it is an armstrong number ");
+    }
+    else
+    {
+        printf(" it is not an armstrong number");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/calculator with switch statment.c b/calculator with switch statment.c
new file mode 100644
index 00000000..c9b590b6
--- /dev/null
+++ b/calculator with switch statment.c	
@@ -0,0 +1,42 @@
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+    int a, b, c;
+    printf("enter the value of a");
+    scanf("%d", &a);
+    printf("enter the value of b");
+    scanf("%d", &b);
+    printf("enter the choice");
+    scanf("%d", &c);
+    switch (c)
+    {
+    case 1:
+        printf("addition=%d", a + b);
+
+        break;
+    case 2:
+        printf("subtraction=%d", a - b);
+
+        break;
+    case 3:
+        printf("multiplication=%d", a * b);
+
+        break;
+    case 4:
+        printf("division=%d", a / b);
+
+        break;
+    case 5:
+        printf("module=%d", a % b);
+
+        break;
+
+    default:
+        printf("invalid operation");
+        break;
+    }
+
+    return 0;
+}
\ No newline at end of file
diff --git a/count_digit_in_num.c b/count_digit_in_num.c
new file mode 100644
index 00000000..e25fa62c
--- /dev/null
+++ b/count_digit_in_num.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+    int n,m, c = 0;
+    printf("enter the number ");
+    scanf("%d", &n);
+    
+    while (n!= 0)
+    {
+
+     
+        m= n % 10;
+
+        c = c + m;
+        n=n/10;
+        
+        
+    }
+    printf("sum=%d", c);
+}
\ No newline at end of file
diff --git a/find 3 angle of triangle.c b/find 3 angle of triangle.c
new file mode 100644
index 00000000..47d22dd7
--- /dev/null
+++ b/find 3 angle of triangle.c	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+int a,b,c;
+printf("enter the value of a");
+scanf("%d",&a); 
+printf("enter the value of b");
+scanf("%d",&b);
+c=180-(a+b);
+printf("%d",c);
+return 0;
+
+
+
+
+}
\ No newline at end of file
diff --git a/find max no by pointer.c b/find max no by pointer.c
new file mode 100644
index 00000000..d8b3dc80
--- /dev/null
+++ b/find max no by pointer.c	
@@ -0,0 +1,22 @@
+#include<stdio.h>
+
+int main()
+
+{
+int a , b , *ptr1 , *ptr2;
+printf("enter the value of a");
+scanf("%d",&a);
+printf("enter the value of b");
+scanf("%d",&b);
+ptr1=&a;
+ptr2=&b;
+if(*ptr1>*ptr2)
+{
+printf("%d is the maximum number",*ptr1);
+}
+else
+{
+printf("%d id the maximum number",*ptr2);
+}
+return 0;
+}
\ No newline at end of file
diff --git a/for print the n odd no.c b/for print the n odd no.c
new file mode 100644
index 00000000..edf1cf66
--- /dev/null
+++ b/for print the n odd no.c	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+int n,i,sum;
+printf("enter the value of n");
+scanf("%d",&n);
+printf("\n %d odd number",n);
+for(i=1;i<=n;i=i+2)
+{
+    n%2!=0;
+printf("%d",i);
+}
+sum+=i;
+printf("%d",sum);
+return 0;
+}
\ No newline at end of file
diff --git a/low to high.c b/low to high.c
new file mode 100644
index 00000000..5a5d5686
--- /dev/null
+++ b/low to high.c	
@@ -0,0 +1,16 @@
+#include<stdio.h>
+
+int main()
+{
+int n;
+printf("enter a number ");
+scanf("%d",&n);
+ int low=-n;
+ while(low<=n)
+{
+    printf("%d",low);
+    low++;
+
+}
+return 0;
+}
\ No newline at end of file
diff --git a/max no out of 3 no.c b/max no out of 3 no.c
new file mode 100644
index 00000000..9e27e77a
--- /dev/null
+++ b/max no out of 3 no.c	
@@ -0,0 +1,25 @@
+#include <stdio.h>
+
+int main()
+{
+    int nm1, nm2, nm3;
+    printf("enter the value of number 1-");
+    scanf("%d", &nm1);
+    printf("enter the value of number 2-");
+    scanf("%d", &nm2);
+    printf("enter the value of number 3-");
+    scanf("%d", &nm3);
+    if (nm1 > nm2 && nm1 > nm3)
+    {
+        printf("the number 1 is maximum number");
+    }
+    else if (nm2 > nm1 && nm2 > nm3)
+    {
+        printf("the number 2 is maximum number");
+    }
+    else
+    {
+        printf("the number 3 is maximum number");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/month and days.c b/month and days.c
new file mode 100644
index 00000000..ca9d7ef1
--- /dev/null
+++ b/month and days.c	
@@ -0,0 +1,25 @@
+
+#include<stdio.h>
+
+int main()
+{
+    int number_of_days, years, months, days;
+
+    /* Reading number of days from user */
+    printf("Enter number of days: ");
+    scanf("%d", &number_of_days);
+
+    years = number_of_days / 365;
+
+    
+    months =number_of_days/30 ;
+
+    days = (number_of_days - years * 365 - months*30);
+
+    // Displaying results
+    printf("Years = %d", years);
+    printf("\nMonths = %d", months);
+    printf("\nDays = %d", days);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/odd or even with using else.c b/odd or even with using else.c
new file mode 100644
index 00000000..df2f9aaa
--- /dev/null
+++ b/odd or even with using else.c	
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+int no;
+printf("enter the number ");
+scanf("%d",&no);
+if(no%2!=0)
+{
+    printf("the given number is odd ");
+}
+else 
+{
+    printf("the given number is even");
+}
+return 0;
+}
\ No newline at end of file
diff --git a/odd or even without else.c b/odd or even without else.c
new file mode 100644
index 00000000..f9d3cb36
--- /dev/null
+++ b/odd or even without else.c	
@@ -0,0 +1,10 @@
+#include<stdio.h>
+
+int main()
+{
+int no,result,odd,even;
+printf("enter a number ");
+scanf("%d",&no);
+no%2!=0 ?printf("the given no is odd ") : printf("the given no is even");
+return 0;
+}
\ No newline at end of file
diff --git a/odd_or_even_of_10_no.c b/odd_or_even_of_10_no.c
new file mode 100644
index 00000000..29c7efeb
--- /dev/null
+++ b/odd_or_even_of_10_no.c
@@ -0,0 +1,28 @@
+#include <stdio.h>
+#include <math.h>
+int main()
+{
+    int n, count = 0, i, d = 0, c = 0;
+
+    for (i = 1; i <= 10; i++)
+    {
+        printf("\nenter the number");
+        scanf("%d", &n);
+    
+  
+        if (n% 2 == 0)
+        {
+            printf("\n%d is a even number", n);
+            d=d+1;
+        }
+        else
+        {
+            printf("\n%d is a odd number",n );
+            c=c+1;
+        }
+    }
+    printf("\ncounteven=%d", d);
+    printf("\ncountodd=%d", c);
+
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-1.c b/pattern-1.c
new file mode 100644
index 00000000..1183ab83
--- /dev/null
+++ b/pattern-1.c
@@ -0,0 +1,15 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j;
+    for (i = 1; i <=4; i++)
+    {
+            for (j = 1; j <= 4; j++)
+            {
+                printf("*");
+            }
+            printf("\n");
+        }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-10.c b/pattern-10.c
new file mode 100644
index 00000000..0edaa47d
--- /dev/null
+++ b/pattern-10.c
@@ -0,0 +1,21 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, n, s;
+    printf("enter the value of n");
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+  
+
+        for (j = 1; j <=i; j++)
+        {
+            printf("*");
+        }
+        
+
+            printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-11.c b/pattern-11.c
new file mode 100644
index 00000000..bbf2b086
--- /dev/null
+++ b/pattern-11.c
@@ -0,0 +1,22 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, s, j, n;
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+        for (s = 1; s <=2*i-1; s++)
+        {
+            printf(" ");
+        }
+           
+        for (j = 1; j <=i; j++)
+            {
+                printf("*");
+            } 
+        
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-12.c b/pattern-12.c
new file mode 100644
index 00000000..f9f66238
--- /dev/null
+++ b/pattern-12.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, s, n;
+    printf("enter the value of n");
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+        for (s = 1; s <= n - i; s++)
+        {
+            printf(" ");
+        }
+        for (j = 65; j <= i+64; j++)
+        {
+            printf("%c", j);
+            
+        }
+        printf("\n");
+    }
+   
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-2.c b/pattern-2.c
new file mode 100644
index 00000000..1cbe3259
--- /dev/null
+++ b/pattern-2.c
@@ -0,0 +1,18 @@
+#include<stdio.h>
+
+int main()
+{
+    int i,j,s;
+    printf("enter the no of stars");
+    scanf("%d",&s);
+    for(i=1;i<=s;i++)
+    {
+        for(j=1;j<=i;j++)
+        {
+        printf("*");
+        }
+    printf("\n");
+    }
+    
+return 0;
+}
\ No newline at end of file
diff --git a/pattern-3.c b/pattern-3.c
new file mode 100644
index 00000000..d2d5048c
--- /dev/null
+++ b/pattern-3.c
@@ -0,0 +1,17 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, s;
+    printf("enter the no of rows");
+    scanf("%d", &s);
+    for (i = s; i >= 1; i--)
+    {
+        for (j = 1; j <= i; j++)
+        {
+            printf("*");
+        }
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-4.c b/pattern-4.c
new file mode 100644
index 00000000..07ac022a
--- /dev/null
+++ b/pattern-4.c
@@ -0,0 +1,17 @@
+#include<stdio.h>
+
+int main()
+{
+    int i,j,s;
+    scanf("%d",&s);
+    for(i=1;i<=5;i++)
+    {
+        
+        for(j=1;j<=i;j++)
+        {
+            printf(" *");
+        }
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-5.c b/pattern-5.c
new file mode 100644
index 00000000..002ee9f8
--- /dev/null
+++ b/pattern-5.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+int main()
+
+{
+
+    int i, j;
+
+    for (i = 5; i >= 1; i--)
+    {
+        for (j = 11; j <= 2*i - 1; j++)
+        {
+            printf("*");
+        }
+    }
+
+    return 0;
+}
diff --git a/pattern-6.c b/pattern-6.c
new file mode 100644
index 00000000..63aa4fa4
--- /dev/null
+++ b/pattern-6.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j;
+
+    for (i = 1; i <= 7; i++)
+    {
+
+        for (j = 1; j <= i; j++)
+        {
+            if (j == 1 || i == j || i == 7)
+            {
+                printf("*");
+            }
+            else
+
+                printf(" ");
+        }
+
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-7.c b/pattern-7.c
new file mode 100644
index 00000000..7026319c
--- /dev/null
+++ b/pattern-7.c
@@ -0,0 +1,22 @@
+
+#include <stdio.h>
+
+int main()
+{
+    int i, j, s;
+          printf("      *\n");
+    for (i = 1; i <= 5; i++)
+    {
+        for (s = i; s < 5; s++)
+        {
+            printf(" ");
+        }
+        for (j = 1; j<=i; j++)
+        {
+            printf("**");
+        }
+
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-8.c b/pattern-8.c
new file mode 100644
index 00000000..1a499db4
--- /dev/null
+++ b/pattern-8.c
@@ -0,0 +1,23 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, n, s;
+    printf("enter the value of n");
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+
+        for (s = 1; s <= n - i; s++)
+        {
+            printf(" ");
+
+           }   for (j = 1; j <= i; j++)
+            {
+                printf("*");
+            }
+        
+        printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pattern-9.c b/pattern-9.c
new file mode 100644
index 00000000..f478f639
--- /dev/null
+++ b/pattern-9.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main()
+{
+    int i, j, n, s;
+    printf("enter the value of n");
+    scanf("%d", &n);
+    for (i = 1; i <= n; i++)
+    {
+  for (s = 0; s < i; s++)
+            {
+                printf(" ");
+            }
+
+        for (j = 1; j <= 7 - (2 * i); j++)
+        {
+            printf("*");
+        }
+        
+
+            printf("\n");
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/pointer - Copy.c b/pointer - Copy.c
new file mode 100644
index 00000000..5b83fa47
--- /dev/null
+++ b/pointer - Copy.c	
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include<math.h>
+
+int main() {
+    int a, b,sum,sub;
+    int *pb,*pa;
+    
+    scanf("%d %d", &a, &b);
+    pa=&a, 
+    pb=&b;
+    
+   
+    sum=*pa+*pb;
+    sub=*pa-*pb;
+    printf("%d",sum);
+    printf("\n%d",sub);
+    return 0;
+}
diff --git a/prime num - Copy.c b/prime num - Copy.c
new file mode 100644
index 00000000..49b1ece7
--- /dev/null
+++ b/prime num - Copy.c	
@@ -0,0 +1,19 @@
+#include<stdio.h>
+int main(){
+ int i, num, n, count;
+ printf("Enter the range: \n");
+ scanf("%d", &n);
+ printf("The prime numbers in between the range 1 to %d:",n);
+ for(num = 1;num<=n;num++){
+         count = 0;
+         for(i=2;i<=num/2;i++){
+             if(num%i==0){
+                 count++;
+                 break;
+             }
+        }
+         if(count==0 && num!= 1)
+             printf("%d ",num);
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/prime num without loop - Copy.c b/prime num without loop - Copy.c
new file mode 100644
index 00000000..9c8a57b1
--- /dev/null
+++ b/prime num without loop - Copy.c	
@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+int main()
+{
+    int n, i=2;
+    printf("enter a number ");
+    scanf("%d",& n);
+    y:
+    if( i <= n)
+    {
+        n % i != 0 ? printf("%d it is a prime number",i) : printf("%d it is not a prime number",i);
+        i++;
+        goto y;
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/print the name by two digit - Copy.c b/print the name by two digit - Copy.c
new file mode 100644
index 00000000..957fc149
--- /dev/null
+++ b/print the name by two digit - Copy.c	
@@ -0,0 +1,21 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main() {
+  
+    int i,d,j;
+    char a[100],m;
+    scanf("%s",&a);
+    for(i=0;i<1;i++)
+    {
+         printf("\n%c %c",a[0],a[1]);
+          printf("\n%c %c",a[2],a[3]);
+           printf("\n%c %c",a[4],a[5]);
+  
+
+      
+    }
+    return 0;
+}
\ No newline at end of file
diff --git a/print the sine fun - Copy.c b/print the sine fun - Copy.c
new file mode 100644
index 00000000..2b171522
--- /dev/null
+++ b/print the sine fun - Copy.c	
@@ -0,0 +1,14 @@
+#include<stdio.h>
+#include<math.h>
+
+int main()
+{
+    double sinevalue,x;
+    printf("please enter the value of calculate sine");
+    x=0.5;
+    sinevalue= sin(x);
+    printf("the sine value of %f is = %f",x,sinevalue);
+
+   
+    return 0;
+}
\ No newline at end of file
diff --git a/print value of sine and cos function for interval - Copy.c b/print value of sine and cos function for interval - Copy.c
new file mode 100644
index 00000000..a60c98db
--- /dev/null
+++ b/print value of sine and cos function for interval - Copy.c	
@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <math.h>
+int main()
+{
+
+  double interval, i;
+  printf("Enter the interval (eg. 0.1):\n");
+  scanf("%lf", &interval);
+  for (i=0 ;i <= 1; i += interval)
+   {
+    printf("sin(%.1f)=%.3f\n", i, sin(i));
+    printf("cos(%.1f)=%.3f\n", i, cos(i));
+
+  }
+  return 0;
+}
\ No newline at end of file
diff --git a/remaining days and month - Copy.c b/remaining days and month - Copy.c
new file mode 100644
index 00000000..eb6325e5
--- /dev/null
+++ b/remaining days and month - Copy.c	
@@ -0,0 +1,11 @@
+#include<stdio.h>
+int main ()
+{
+   int months, days ;
+   printf("Enter days\n") ;
+   scanf("%d", &days) ;
+   months = days / 30 ;
+   days = days % 30 ;
+   printf("Months = %d Days = %d", months, days) ;
+return 0;
+}
\ No newline at end of file
diff --git a/reverse a number by goto statment - Copy.c b/reverse a number by goto statment - Copy.c
new file mode 100644
index 00000000..2ed466da
--- /dev/null
+++ b/reverse a number by goto statment - Copy.c	
@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <math.h>
+
+int main()
+{
+    int no, rem, rev = 0;
+    printf("enter a number");
+    scanf("%d", &no);
+label:
+    rem = no % 10;
+    rev = rev * 10 + rem;
+    no = no / 10;
+    if (no != 0)
+    {
+        goto label;
+    }
+    printf("%d", rev);
+    return 0;
+}
\ No newline at end of file
diff --git a/sum_of_all_digits - Copy.c b/sum_of_all_digits - Copy.c
new file mode 100644
index 00000000..5c29954c
--- /dev/null
+++ b/sum_of_all_digits - Copy.c	
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main() {
+	int n,m,sum=0;
+    scanf("%d",&n);
+  while(n>0)
+  {
+    
+        m=n%10;
+        sum=sum+m;
+        n=n/10;
+  }
+    printf("%d",sum);
+    return 0;
+}
\ No newline at end of file
diff --git a/sum_of_first_and_last_num - Copy.c b/sum_of_first_and_last_num - Copy.c
new file mode 100644
index 00000000..6f776d3f
--- /dev/null
+++ b/sum_of_first_and_last_num - Copy.c	
@@ -0,0 +1,27 @@
+#include<stdio.h>
+#include<math.h>
+
+int main()
+{
+    int n , m,c=0;
+    printf("enter the nummber ");
+    scanf("%d",& n);
+    while(n!=0)
+    {
+        
+        m=n%10;
+        c=c+m;
+        n=n/10;
+        break;
+    }
+     while(n!=0)
+    {
+        n=n/10;
+        m=n%10;
+        c=c+m;
+        
+        break;
+    }
+    printf("sum of last two digit=%d",c);
+return 0;
+}
\ No newline at end of file
diff --git a/sum_of_num_by_array - Copy.c b/sum_of_num_by_array - Copy.c
new file mode 100644
index 00000000..a42f25b7
--- /dev/null
+++ b/sum_of_num_by_array - Copy.c	
@@ -0,0 +1,25 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main() 
+{
+
+   int n,a[n],sum=0,i;
+   scanf("%d",&n);
+ 
+   for(i=1;i<n;i++)
+   {
+    
+     scanf("%d ",&a[n]);
+ 
+   }  
+   for(i=1;i<=n;i++)
+   {
+    sum=sum+a[n];
+   } 
+  
+   printf("sum=%d",sum);
+    return 0;
+}
\ No newline at end of file