fabs c c++

The "fabs" function in C++ is used to calculate the absolute value of a floating-point number. It takes a single argument, which is the number whose absolute value needs to be calculated. The return value is the absolute value of the input number.

Here is an example usage:

#include <iostream>
#include <cmath>

int main() {
  double x = -10.5;
  double result = fabs(x);

  std::cout << "The absolute value of " << x << " is " << result << std::endl;

  return 0;
}

In this example, we include the <cmath> header file, which contains the declaration of the fabs function. We then declare a variable x and assign it a value of -10.5. We call the fabs function with x as the argument, and store the result in the variable result. Finally, we print the result using std::cout.

The output of this program will be:

The absolute value of -10.5 is 10.5

This demonstrates how the fabs function can be used to calculate the absolute value of a floating-point number in C++.