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C++ Math isfinite() Function

C++ Math isfinite() Function 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 isfinite()

The function determines the value whether it is finite or not. It should not be NaN or infinite value. If the number is finite, it returns 1 otherwise 0.

Note: A finite value is a value that is neither NAN nor infinite.

Syntax

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

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

Parameter

x: It is a floating point value.

Return value

Parameter(x) Return value
Finite value 1
NAN or infinite value 0

Example 1

Let's see the simple example when the value of x is 10.

#include 
#include
using namespace std;
int main()
{
    int x=10;
    cout<<"value of x is : "<

Output:

value of x is : 10
isfinite(x) : 1

In this example, infinite() function determines that value of x is finite. Therefore, it returns 1.

Example 2

Let's see another simple example.

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

Output:

value of x is : -nan
isfinite(x) : 0

In this example, isfinite() function determines that x is a Not a Number. Therefore, it returns 0.

Example 3

Let's see the simple example when the value of x is 1.0/0.0.

#include 
#include
using namespace std;
int main()
{
    float x=1.0/0.0;
    cout<<"value of x is : "<

Output:

value of x is : inf
isfinite(x) : 0

In this example, isfinite(x) determines that x is a infinite number.Therefore, it returns 0 value.


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