fabs() function is a library function of cmath header, it is used to find the absolute value of the given number, it accepts a number and returns absolute value.
fabs()函数是cmath标头的库函数，用于查找给定数字的绝对值，它接受一个数字并返回绝对值。
Note: abs() function of cmath header can also be used for the same purpose.
注意： cmath标头的abs()函数也可以用于相同的目的。
Syntax of fabs() function:
fabs()函数的语法：
fabs(x);Parameter(s): x – is the number whose absolute value is returned.
参数： x –是返回其绝对值的数字。
Return value: double – it returns double value that is the absolute value of x.
返回值： double-返回double值，它是x的绝对值。
Example:
例：
Input: float x = -1012.232; Function call: fabs(x); Output: 1012.232 C ++代码演示fabs()函数的示例 (C++ code to demonstrate the example of fabs() function) // C++ code to demonstrate the example of // fabs() function#include <iostream>#include <cmath>using namespace std;// main() sectionint main(){ float x; float result; x = -10; cout<<"fabs("<<x<<"): "<<fabs(x)<<endl; x = -1012.232; cout<<"fabs("<<x<<"): "<<fabs(x)<<endl; x = 1012.232; cout<<"fabs("<<x<<"): "<<fabs(x)<<endl; x = -.908; cout<<"fabs("<<x<<"): "<<fabs(x)<<endl; return 0;}Output
输出量
fabs(-10): 10fabs(-1012.23): 1012.23fabs(1012.23): 1012.23fabs(-0.908): 0.908翻译自: https://www.includehelp.com/cpp-tutorial/fabs-function-with-example.aspx