isnormal() in C++ - GeeksforGeeks

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);

bool  isnormal(double x);

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.

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

Example 1:- To show with float value

// 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

// 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

// 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

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