Basics of C

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 ;
+
+}

Area of circle.c

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+#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;
+}

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;
+}

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;
+}

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;
+}

Example of pointer.c

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+#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;
+
+
+}

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;
+   }*/
+
+

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 ;
+}

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;
+}

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;
+}

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++;
+    }
+
+}

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;
+}

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;
+}

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;
+}

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;
+
+}

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;
+}

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;
+}

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;
+}

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;
+}