C program for "Two numbers are input through the keyboard into two locations C and D. Write a program to interchange the contents of C and D without using third variable."

Problem:  C program for "Two numbers are input through the keyboard into two locations C and D. Write a program to interchange the contents of C and D without using third variable."

Logic used : 

Add C and D and store the value in C.

Subtract D from C and store the value in D.

Again subtract D from C and store the value in C.

Demo :

c = c + d;

d = c - d;

c = c - d;

C program :

// Program by Shyam Kanth

#include<stdio.h>

int main(){

    int c,d;

    printf("Enter C : ");

    scanf("%d",&c);

    printf("Enter D : ");

    scanf("%d",&d);

    printf("Before swapping : \n");

    printf("C = %d and D = %d.\n",c,d);

    c = c+d;

    d = c-d;

    c = c-d;

    printf("After swapping : \n");

    printf("C = %d and D = %d.",c,d);

    return 0;

}

Codes used : 

• #include < stdio.h > : Header file for input ouptut
• int : Integer data type
• c,d : Variable used
• printf : Function for displaying message
• scanf : Function for taking input
• %d : Format specifier for integer value

Do comment, if any doubt

Know about me : Shyam Kanth