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 <iostream>
#include <cmath>

using namespace std;

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

int main()
{
	cout << "isnormal(1.0)        = " << isnormal(1.0) << endl;
	cout << "isnormal(-1.0)       = " << isnormal(-1.0) << endl;
	cout << "isnormal(0.0)        = " << isnormal(0.0) << endl;
	cout << "isnormal(NAN)        = " << isnormal(NAN) << endl;
	cout << "isnormal(INFINITY)   = " << isnormal(INFINITY) << endl;

	return 0;
}

/*
run:

isnormal(1.0)        = 1
isnormal(-1.0)       = 1
isnormal(0.0)        = 0
isnormal(NAN)        = 0
isnormal(INFINITY)   = 0

*/

 

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