1.) Program to swap the value of three variable without using fourth variable.

 

// program to swap the value of three variable without using fourth variable.

#include <conio.h>

#include <stdio.h>

int main()

{

    int a, b, c;

    printf("Enter the value of a,b,c:\n");

    scanf("%d%d%d", &a, &b, &c);

    a = a + b + c;

    c = a - (b + c);

    b = a - (b + c);

    a = a - (b + c);

    printf("The value of a,b and c after interchange is

\na = %d,\nb = %d,\nc = %d", a, b, c);

    return 0;

}

Output:

Enter the value of a,b,c: 8 9 10 The value of a,b and c after interchange is a = 9, b = 10, c = 8

***** THANK YOU *****