Thread: How to raise different floating point exceptions in C?

I am interested in raising floating point exceptions like Division by zero, Overflow, Underflow, etc.

I am using functions in fenv.h and signal handling. Whenever, any floating point exception occurs,

The problem seems like when inside the function catch_fpe ,the flags set by feraiseexcept somehow gets cleared and no condition is true.

Code:

 
#define _GNU_SOURCE
#include <fenv.h>
#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
void catch_fpe(int sig)
{
  //#pragma STDC FENV_ACCESS ON 
  printf("i am in catch_fpe\n");
  if (fetestexcept(FE_OVERFLOW))
    printf("OVERFLOW\n");
  else if (fetestexcept(FE_UNDERFLOW))
    printf("UNDERFLOW\n");
  else if (fetestexcept(FE_DIVBYZERO))
    printf("DIVBYZERO\n");
  else if (fetestexcept(FE_INVALID))
    printf("INVALID OPERATION\n");
  else if (fetestexcept(FE_INEXACT))
    printf("INEXACT RESULT\n");
  exit(0);
}

int main()
{
  feclearexcept(FE_ALL_EXCEPT);
  feenableexcept(FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | FE_UNDERFLOW);
  signal(SIGFPE, catch_fpe);
  feraiseexcept(FE_DIVBYZERO);
}