Question

How to use isnormal() function to check if a floating point number is normal, not zero, subnormal, infinite, NaN in C

Answer 1

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

// Return non-zero if x is a normal and zero otherwise

int main(int argc, char **argv)
{	
	printf("isnormal(1.0)        = %d\n", isnormal(1.0));
	printf("isnormal(-1.0)       = %d\n", isnormal(-1.0));
	printf("isnormal(1.0 / 0.0)  = %d\n", isnormal(1.0 / 0.0));
	printf("isnormal(-1.0 / 0.0) = %d\n", isnormal(-1.0 / 0.0));
	printf("isnormal(0.0)        = %d\n", isnormal(0.0));
	printf("isnormal(NAN)        = %d\n", isnormal(NAN));
    printf("isnormal(INFINITY)   = %d\n", isnormal(INFINITY));
	printf("isnormal(0.0 / 0.0)  = %d\n", isnormal(0.0 / 0.0));
	printf("isnormal(INFINITY -INFINITY) = %d\n", isnormal(INFINITY -INFINITY)); 
	
    return 0;
}


/*
run:
  
isnormal(1.0)        = 1
isnormal(-1.0)       = 1
isnormal(1.0 / 0.0)  = 0
isnormal(-1.0 / 0.0) = 0
isnormal(0.0)        = 0
isnormal(NAN)        = 0
isnormal(INFINITY)   = 0
isnormal(0.0 / 0.0)  = 0
isnormal(INFINITY -INFINITY) = 0

*/

 

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