Swapping two variables in C

Yes.. Its very much possible.. You people dont know that.. Too bad.. Ok I will show you how to do it.. Let a and b be two integers. then the following code will work. int a , b; a=5; b=10; //now a = 5 and b = 10 a=a+b; //now a = 15 and b =10 b=a-b; //now a=15 and b = 5 a=a-b; //now a = 10 and b =5 which is the required output.. :) such an easy answer... njoy

here is one more answer int x,y; x ^= y ^= x ^= y; ^ is XOR bit wise operation execution is left to right...

i dont think its possible...maybe with writing the memory directly...however its the same with using a temp. variable

no u cannot swap widout using temp variable

Its simple a=10 b=5 a=a+b; 10+5; b=a-b; 15-5=10; a=a-b; 15-5=5; there you go

Hi, It is very easy. I m writting an example in C. If you can not understand then please let me know. int main() { int i = 5; int j = 3; i = i + j; j = i - j; i = i - j; return 0; }

It was a very good discussion.It is because of this discussion we came to know that it is possible.

we can swap to variables without using the third variables as codes are already given (using arithmetical or using bitwise XOR operator) but the thing i want to say is , they are not the standard one THEY CAN NOT BE USE AS AN ALTERNATIVE FOR SWAPPING USING THIRD VARIABLE. SO THERE IS NO OTHER CORRECT VERSION FOR SWAPPING TWO VARIABLES WITHOUT USING THIRD VARIABLE , i ams now explaining, do one thing as all of you must have gone throug both codes given here in discussions just try to swap given two variable with given value using those to codes you will come to the conclusion x=-5; y=10; TRY IT YOUR SELF,,,,,, and mark my response as the best response....

int a= 10, b= 5; printf("a value %d", b); printf("b value %d", a);

ya u can do that see this code a = a + b; b = a + c; b = a-c some thing like that try it is possible.

its easy a,b are variables then just a=a+b; b=a-b; a=a-b;

void main() { int a,b; coutab; swap(a,b); } Swap(int x,int y) { x=x+y; y=x-y;//to swap y x=x-y;//to swap x }

i am not sure if i can swapping two variables without using temp variable in C. you know variables declared the address of the memory, or a variable has its own place in the memory. so if you swapped it without using temporary variables one of them will be overwrite with the other ones. so i think you need a temporary variables to swap variables in C.

Well that was a good but childish example bro.For loop is the fastest loop.keep posting nice topics.

I agree with the first poster, I'm pretty sure its not possible. Even when you program in assembly or machine code it still requires a temporary variable so I don't see why C would be any different.