Changing(swapping) value of two variables without use of third variable.

#include<stdio.h>

int main()

{

int n1,n2;

printf("Enter n1:");

scanf("%d",&n1);

printf("Enter n2:");

scanf("%d",&n2);

n1=n1+n2;

n2=n1-n2;

n1=n1-n2;

printf("n1=%d \n",n1);

printf("n2=%d",n2);
return 0;

}

/*Output

Enter n1:10

Enter n2:20

n1=20

n2=10

*/

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