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fabs() function with example in C++

C++ fabs() function: Here, we are going to learn about the fabs() function with example of cmath header in C++ programming language.
Submitted by IncludeHelp, on April 26, 2019

C++ fabs() function

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.

Note: abs() function of cmath header can also be used for the same purpose.

Syntax of fabs() function:


Parameter(s): x – is the number whose absolute value is returned.

Return value: double – it returns double value that is the absolute value of x.


    float x = -1012.232;

    Function call:


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() section
int 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;


fabs(-10): 10
fabs(-1012.23): 1012.23
fabs(1012.23): 1012.23
fabs(-0.908): 0.908

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