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:
Example
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.
Example
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
int x=10;
cout<<"value of x is : "<<x<<'\n';
cout<<"isfinite(x) : "<<isfinite(x);
return 0;
}
Output:
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.
Example
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
double x=0.0/0.0;
cout<<"value of x is : "<<x<<'\n';
cout<<"isfinite(x) : "<<isfinite(x);
return 0;
}
Output:
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.
Example
#include <iostream>
#include<math.h>
using namespace std;
int main()
{
float x=1.0/0.0;
cout<<"value of x is : "<<x<<'\n';
cout<<"isfinite(x) : "<<isfinite(x);
return 0;
}
Output:
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.