swap two numbers

#include <stdlib.h>
#include <stdio.h>

int main() {
    int a, b, c, d;

    printf("Enter a number 'a' = ");
    scanf("%d", &a);

    printf("Enter a number 'b' = ");
    scanf("%d", &b);

    c = a;
    d = b;

    a = d;
    b = c;

    printf("The value in 'a' = %d\n", a);
    printf("The value in 'b' = %d\n", b);

    return 0;
}