#include <stdio.h>

// Function to swap the values of two integers using pointers

void swap(int *a, int *b)

{

    int temp = *a;  // Store the value at the address pointed by ‘a’ in a temporary variable

    *a = *b;        // Assign the value at the address pointed by ‘b’ to the address pointed by ‘a’

    *b = temp;      // Assign the value stored in the temporary variable to the address pointed by ‘b’

}

int main()

{

    int num1 = 5, num2 = 10;

    // Print the initial values

    printf(“Before swapping: num1 = %d, num2 = %dn”, num1, num2);

    // Call the swap function with the addresses of num1 and num2

    swap(&num1, &num2);

    // Print the values after swapping

    printf(“After swapping: num1 = %d, num2 = %dn”, num1, num2);

    return 0;

}

Output:

#include <stdio.h>

// Function to find the sum of elements in an array

int findSum(int *arr, int size)

{

    int sum = 0;

    // Loop through each element of the array using a pointer

    for (int i = 0; i < size; i++)

    {

        sum += *(arr + i); // Access each element using pointer arithmetic

    }

    return sum; // Return the calculated sum

}

int main()

{

    // Declare an array of integers

    int numbers[] = {1, 2, 3, 4, 5};

    int size = sizeof(numbers) / sizeof(numbers[0]); // Calculate the size of the array

    // Print the elements of the array

    printf(“Array elements: “);

    for (int i = 0; i < size; i++)

    {

        printf(“%d “, numbers[i]);

    }

    // Call the findSum function to calculate the sum of array elements

    int result = findSum(numbers, size);

    // Print the sum of array elements

    printf(“nSum of array elements: %dn”, result);

    return 0;

}