int signbit(fpval): Returns nonzero if fpval is negative (that is, its sign bit is set) : signbit « math.h « C / ANSI-C

1. C / ANSI-C
2. math.h
3. signbit

int signbit(fpval): Returns nonzero if fpval is negative (that is, its sign bit is set)

  

#include <stdio.h>
#include <math.h>

int main(void)
{
  printf("signbit(-1.0) %d\n", signbit(-1.0));
  printf("signbit(1.0) %d\n", signbit(1.0));
  printf("signbit(0.0) %d\n", signbit(0.0));
  return 0;
}

         
/*
signbit(-1.0) 512
signbit(1.0) 0
signbit(0.0) 0        
*/ 

           
       

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