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C Question and Answer

Swap two variables without using third variable.

 Answer

#include

int main(){

int a=5,b=10;

//process one

a=b+a;

b=a-b;

a=a-b;

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

//process two

a=5;

b=10;

a=a+b-(b=a);

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

//process three

a=5;

b=10;

a=a^b;

b=a^b;

a=b^a;

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

//process four

a=5;

b=10;

a=b-~a-1;

b=a+~b+1;

a=a+~b+1;

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

//process five

a=5,

b=10;

a=b+a,b=a-b,a=a-b;

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

getch();

}