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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();

}