C++ Math isnan() Functions

C++ Math isnan() Functions with tutorial for beginners and professionals with examples on isgreaterequal(), less(), islessequal(), islessgreater(), isunordered(), exp(), frexp(), ldexp(), log(), log10(), modf(), exp2(), expm1(), log1p(), log2(), logb(), scalbn(), scalbln() etc.

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C++ Math isnan()

The function checks whether the number is a Not a Number or not. If the number is NaN, it returns 1 otherwise 0.

Note: The NaN is a non-representable value for floating point elements such as square root of negative number or the result of 0/0.

Syntax

Suppose a number is 'x'. Syntax would be:

bool isnan(float x);
bool isnan(double x);
bool isnan(long double x);
bool isnan(integral x);

Parameter

x: It is a floating point value.

Return value

It returns 1, if x is NAN otherwise 0.

Example 1

Let's see the simple example when the value of x is 0.0/0.0.

#include 
#include
using namespace std;
int main()
{
    float x=0.0/0.0;
    cout<<"value of x is : "<

Output:

value of x is : -nan
isnan(x) : 1

In this example, isnan(x) determines that the value of x is nan. Therefore, it returns 1.

Example 2

Let's see the simple example when the value of x is 4.3.

#include 
#include
using namespace std;
int main()
{
    float x=4.3;
    cout<<"value of x is : "<

Output:

value of x is : 4.3
isnan(x) : 0

In this example, isnan(x) function determines that the value of x is not 'nan'. Therefore, it returns 0 value.

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