C++ isfinite()

The isfinite() function returns a value telling whether the argument has a finite value.

Syntax

isfinite(x)

The x parameter is finite if it is a floating-point number that is neither infinite nor NaN (e.g., division by zero, square root of a negative value).

If x is finite, the isfinite() function will return a non-zero value for true. Otherwise, it will return zero for false.

Example

The following example uses the isfinite() function to check whether 5.0 is finite:

#include <iostream>
#include <cmath>

int main() {
  int result;

  result = std::isfinite(5.0);

  if (result == 0) {
    std::cout << "Not finite" << "\n";
  }
  else {
    std::cout << "Is finite" << "\n";
  }
  // Output: Is finite
}

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Codebyte Example

The following example is runnable and features a case where running the isfinite() function where the returns false and the value is not finite:

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