Write a C program to swap two numbers using a function and pointers

Description: Write a function which swaps the values of two variables. The values must change in the main() function.

Hint:

• Pass the addresses of the variables with &, and use * inside the function.

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C program to swap two numbers using pointers

#include <stdio.h>

void swap(int *a, int *b) {
    int temp = *a;
    *a = *b;
    *b = temp;
}

int main(void) {
    int x, y;

    printf("Enter two numbers: ");
    scanf("%d %d", &x, &y);

    swap(&x, &y);
    printf("After swapping: x = %d, y = %d\n", x, y);
    return 0;
}

Output:

How it works

• The function gets the addresses of x and y, so it changes the original values.
• With normal parameters (call by value), the function would swap only its own copies.

Read Call by Value and Reference.

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