# 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:

```    fabs(x);
```

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.

Example:

```    Input:
float x = -1012.232;

Function call:
fabs(x);

Output:
1012.232
```

### 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;
}
```

Output

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

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