swap two numbers without temp variable

1. Using Addition and Subtraction

#include<stdio.h>

int main()

{

int a,b;

printf("Enter values :");

scanf("%d%d",&a,&b);

printf("Before swapping values :");

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

a=a+b;

b=a-b;

a=a-b;

printf("After swapping values :");

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

return 0;

}

Output :

Enter values :4

6

Before swapping values :a=4 ,b=6

After swapping values :a=6 ,b=4

When a and b are too large after addition, the value may go out of integer range.

2. Using Multiplication and Division

#include<stdio.h>

int main()

{

int a,b;

printf("Enter values :");

scanf("%d%d",&a,&b);

printf("Before swapping values :");

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

a=a * b;

b=a / b;

a=a / b;

printf("After swapping values :");

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

return 0;

}

Output :

Enter values :4

6

Before swapping values :a=4 ,b=6

After swapping values :a=6 ,b=4

This approach does not work when one of the numbers is  0.

When a and b are too large after multiplication, the value may go out of integer range.

3. Using Bitwise XOR

#include<stdio.h>

int main()

{

int a,b;

printf("Enter values :");

scanf("%d%d",&a,&b);

printf("Before swapping values :");

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

a=a ^ b;

b=a ^ b;

a=a ^ b;

printf("After swapping values :");

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

return 0;

}

Output :

Enter values :4

6

Before swapping values :a=4 ,b=6

After swapping values :a=6 ,b=4