luc009.c

Problem Statement

luc009.c

Two numbers are input through the keyboard into two locations C and D. Write a program to interchange the contents of C and D.

Source Code

#include <stdio.h>
int main()
{
    double a, b;
    printf("Enter the two number A and B : ");
    scanf("%lf %lf", &a, &b);
    printf("\nBefore Interchange : ");
    printf("\nA = %g (Memory location = %p)", a, &a);
    printf("\nB = %g (Memory location = %p)", b, &b);
    a = a + b;
    b = a - b;
    a = a - b;
    printf("\nAfter Interchange :");
    printf("\nA = %g (Memory location = %p)", a, &a);
    printf("\nB = %g (Memory location = %p)", b, &b);
    return 0;
}

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● Author - Amit Dutta · Updated - 12 Dec 2025