Name: G.Ramanujam

Reg.No: 212224240129

EX-21-POINTERS

AIM:

Write a C program to convert a 23.65 into 25 using pointer

ALGORITHM:

1. Declare a double variable to hold the floating-point number (23.65).
2. Declare a pointer to double to point to the address of the variable.
3. Use the pointer to modify the value to 25.0.
4. Print the modified value.

PROGRAM:

#include <stdio.h>

int main() {
    double num = 23.65;
    double *ptr;
    
    ptr = &num;
    
    *ptr = 25.0;
    
    printf("Modified value: %.2f\n", num);
    
    return 0;
}

OUTPUT:

RESULT:

Thus the program to convert a 23.65 into 25 using pointer has been executed successfully.

EX-22-FUNCTIONS AND STORAGE CLASS

AIM:

Write a C program to calculate the Product of first 12 natural numbers using Recursion

ALGORITHM:

1. Define a recursive function calculateProduct that takes an integer parameter n.
2. Return n multiplied by the result of the calculateProduct function called with n - 1.
3. Declare an integer variable n and an unsigned long long variable product.
4. Initialize n with the value 12 (for the first 12 natural numbers).
5. Call the calculateProduct function with n and store the result in the product variable.
6. Print the result, indicating it is the product of the first 12 natural numbers.

PROGRAM:

#include <stdio.h>

unsigned long long calculateProduct(int n) {
    if (n == 1)
        return 1;
    else
        return n * calculateProduct(n - 1);
}

int main() {
    int n = 12;
    unsigned long long product;
    
    product = calculateProduct(n);
    
    printf("The product of the first 12 natural numbers is: %llu\n", product);
    
    return 0;
}

OUTPUT:

RESULT:

Thus the program has been executed successfully.

EX-23-ARRAYS AND ITS OPERATIONS

AIM:

Write C Program to find Sum of each row of a Matrix

ALGORITHM:

1. Declare and initialize the matrix with the desired values.
2. Create a loop to iterate through each row of the matrix.
3. Inside the loop, calculate the sum of the elements in each row.
4. Print the sum for each row.

PROGRAM:

#include <stdio.h>

int main() {
    int rows, cols, i, j, sum;
    int matrix[10][10];
    
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    
    printf("Enter number of columns: ");
    scanf("%d", &cols);
    
    printf("Enter elements of the matrix:\n");
    for(i = 0; i < rows; i++) {
        for(j = 0; j < cols; j++) {
            scanf("%d", &matrix[i][j]);
        }
    }
    
    for(i = 0; i < rows; i++) {
        sum = 0;
        for(j = 0; j < cols; j++) {
            sum += matrix[i][j];
        }
        printf("Sum of row %d = %d\n", i + 1, sum);
    }
    
    return 0;
}

OUTPUT

RESULT

Thus the program has been executed successfully.

EX-24-STRINGS

AIM:

Write C program for the below pyramid string pattern. Enter a string: PROGRAM Enter number of rows: 5 P R O G R A M P R O G R A M P R O G R A M

ALGORITHM:

1. Input the number of rows for the pyramid (e.g., num_rows).
2. Initialize variables:i for the row count (starting from 1),j for the character count (starting from 1)
3. Start a loop for i from 1 to num_rows (for each row of the pyramid).
4. Calculate the midpoint position as midpoint = (2 * num_rows - 1) / 2.
5. End the program.

PROGRAM:

#include <stdio.h>
#include <string.h>
int main() 
{
    char str[100];
    int rows;
    printf("Enter a string: ");
    fgets(str, sizeof(str), stdin);
    str[strcspn(str, "\n")] = '\0';
    printf("Enter number of rows: ");
    scanf("%d", &rows);
    int length = strlen(str);  
    for (int i = 1; i <= rows; i++) 
    {
       
        for (int j = 1; j <= rows - i; j++) 
        {
            printf(" ");
        }
        for (int j = 0; j < i; j++) 
        {
            printf("%c ", str[j % length]);  
        }
        printf("\n");
    }
    return 0;
}

OUTPUT

RESULT

Thus the C program to String process executed successfully

.

EX -25 –DISPLAYING ARRAYS USING POINTERS

AIM

Write a c program to read and display an array of any 6 integer elements using pointer

ALGORITHM

Step 1: Start the program. Step 2: Declare the following: • Integer variable i for iteration. • Integer variable n to store the number of elements. • Integer array arr[10] to hold up to 10 elements. • Integer pointer parr and initialize it to point to the array arr. Step 3: Read the value of n (number of elements) from the user. Step 4: Loop from i = 0 to i < n: • Read an integer value and store it in the address parr + i using pointer arithmetic. Step 5: Loop from i = 0 to i < n: • Print the element at *(parr + i) using pointer dereferencing. Step 6: End the program.

PROGRAM

#include <stdio.h>

int main() {
    int i, n;
    int arr[10];
    int *parr = arr;
    
    printf("Enter number of elements (max 10): ");
    scanf("%d", &n);
    
    printf("Enter %d elements:\n", n);
    for(i = 0; i < n; i++) {
        scanf("%d", (parr + i));
    }
    
    printf("The array elements are:\n");
    for(i = 0; i < n; i++) {
        printf("%d ", *(parr + i));
    }
    
    return 0;
}

OUTPUT

RESULT

Thus the C program to read and display an array of any 6 integer elements using pointer has been executed