Help in ANARC08E

[spongebob_sof]

I don't know which part of my code is wrong?
help me please!

#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[])
{
  int x1,x2;
  for(;scanf("%d %d",&x1,&x2)>=0 && x1!=-1 && x2!=-1 ;){
                 if(x1==0 || x1==1 || x2==0 || x2==1)
                                   printf("%d+%d=%d\n",x1,x2,x1+x2);
                 else 
                                   printf("%d+%d!=%d\n",x1,x2,x1+x2);
  } 
  system("PAUSE");	
  return 0;
}

[leppyr64]

How have you tested your code? Surely you've used more than just the test cases in the example. It shouldn't be hard to verify your results for relatively small inputs.

Coming up with test cases is a larger part of problem solving than writing code. Code is just a tool.