Answer Posted / insane programmer

#include<stdio.h>
#include<conio.h>

void main()
{
int a=100, b=30;
clrscr();

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

printf("Swapping without using third variable (using + and -).\n\n");
printf("Value of a=%d and b=%d.", a,b);
getch();
}

you can get more example here http://rajkishor09.hubpages.com/_eknow/hub/How-to-swap-two-numbers-without-using-third-temp-variable

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