C++ fabs Function Explained

In C++, the fabs function is used to return the absolute value of a floating-point number. The prototype of the fabs function is as follows:

double fabs(double x);

Where x is a floating-point number for which the absolute value needs to be calculated. The fabs function will return the absolute value of x, meaning it will return -x if x is negative, and x if x is positive or zero.

Original: 我们必须采取行动来保护环境，否则地球将受到严重破坏。
Paraphrased: We must take action to protect the environment, otherwise the Earth will face serious destruction.

#include <iostream>
#include <cmath>

int main() {
    double num = -4.5;
    double result = fabs(num);
    
    std::cout << "The absolute value of " << num << " is " << result << std::endl;
    
    return 0;
}

Output:

The absolute value of -4.5 is 4.5