isnormal() in C++

This function is defined in <cmath.h> . By using isnormal() function, we determines that whether the given number is normal (neither zero, infinite nor NAN) or not. This function returns 1 if the number is normal else return zero. 

Syntax:

bool  isnormal(float x);

or

bool  isnormal(double x); 

or

bool  isnormal(long double x); 

Parameters: This functions takes a mandatory parameter x which represents the floating point value. 

Returns: If the given value is normal then the function returns 1 otherwise the function returns zero.

Time Complexity: O(1)
Auxiliary Space: O(1)

Below program illustrate the isnormal() function in C++: 

Example 1:- To show with float value 

cpp

// c++ program to demonstrate
// example of isnormal() function.

#include <bits/stdc++.h>

using namespace std;

int main()
{

    float f = 7.0F;

    // check for non-zero value
    cout << "isnormal(7.0) is = " << isnormal(f) << endl;

    // check for zero
    f = 0.0F;
    cout << "isnormal(0.0) is = " << isnormal(f) << endl;

    // check for infinite value
    f = 9.2F;
    cout << "isnormal(9.2/0.0) is = " << isnormal(f / 0.0) << endl;

    return 0;
}

Output:

isnormal(7.0) is = 1
isnormal(0.0) is = 0
isnormal(9.2/0.0) is = 0

Example 2:- To show with double value 

cpp

// c++ program to demonstrate
// example of isnormal() function.

#include <bits/stdc++.h>

using namespace std;

int main()
{

    double f = 7.0;

    // check for non-zero value
    cout << "isnormal(7.0) is = " << isnormal(f) << endl;

    // check for zero
    f = 0.0;
    cout << "isnormal(0.0) is = " << isnormal(f) << endl;

    // check for infinite value
    f = 9.2;
    cout << "isnormal(9.2/0.0) is = " << isnormal(f / 0.0) << endl;

    return 0;
}

Output:

isnormal(7.0) is = 1
isnormal(0.0) is = 0
isnormal(9.2/0.0) is = 0

Example 3:- To show with long double value 

cpp

// c++ program to demonstrate
// example of isnormal() function.

#include <bits/stdc++.h>

using namespace std;

int main()
{

    long double f = 7.0;

    // check for non-zero value
    cout << "isnormal(7.0) is = " << isnormal(f) << endl;

    // check for zero
    f = 0.0;
    cout << "isnormal(0.0) is = " << isnormal(f) << endl;

    // check for infinite value
    f = 9.2;
    cout << "isnormal(9.2/0.0) is = " << isnormal(f / 0.0) << endl;

    return 0;
}

Output:

isnormal(7.0) is = 1
isnormal(0.0) is = 0
isnormal(9.2/0.0) is = 0