Swap two variables without using third variable

/*Swap two variables without using third variable.*/



#include< stdio.h >
int main(){
int a=5,b=10;

/* method 1 */

a=b+a;
b=a-b;
a=a-b;
printf("a= %d b= %d",a,b);

/* method 2 */

a=5;
b=10;
a=a+b-(b=a);
printf("\na= %d b= %d",a,b);

/* method 3 */

a=5;
b=10;
a=a^b;
b=a^b;
a=b^a;
printf("\na= %d b= %d",a,b);

/* method 4 */

a=5;
b=10;
a=b-~a-1;
b=a+~b+1;
a=a+~b+1;
printf("\na= %d b= %d",a,b);

/* method 5 */

a=5,
b=10;
a=b+a,b=a-b,a=a-b;
printf("\na= %d b= %d",a,b);
getch();

}