Question

Write a program to initialize two integer variables a and b and interchange them. For example, if initially a = 5 and b= 10, then after interchanging it should be a = 10 and b=5.​

Answer 1

#include <stdio.h>

int main()

{

int a = 10, b = 20;

printf("Before swap a=%d b=%d", a, b);

a = a + b; //a=30 (10+20)

b = a - b; //b=10 (30-20)

a = a - b; //a=20 (30-10)

printf("\nAfter swap a=%d b=%d", a, b);

return 0;

}