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Predict the output of following program. Assume that the numbers are stored in 2's complement form.

#include<stdio.h>

int  main()

{

   unsigned int x = -1;

   int y = ~0;

   if (x == y)

      printf("same");

   else

      printf("not same");

   return 0;

}

1.SAME

2.NOT SAME

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1 Answer

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#include <stdio.h>
int  main() {
  unsigned int x = -1; // bit pattern = all ones
  int y = ~0; // bit pattern = all ones
  if (x == y) // y is promoted to unsigned int 
        // ( as common type) for comparison
    printf("same"); // gets printed
  else
    printf("not same");
  return 0;
}
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