# fabs function in C :

The *fabs* function is defined in *math.h* header file. It is used to find out the absolute value of a number. *fabs* takes one double number as argument and returns the absolute value of that number. In this tutorial , we will show you how to use *fabs* function in C with examples.

## Syntax of fabs :

The syntax of *fabs()* is as below :

`double fabs(double n)`

As you can see that it takes one double parameter *n* and returns its absolute value as *double*.

Always remember to pass one *double* number to this function. If you want to find the absolute value for an integer or floating point number, first convert it to a double.

## Example of using fabs :

Now letâ€™s try to find the absolute values for a set of numbers using fabs :

```
#include <stdio.h>
#include <math.h>
int main()
{
double n;
n = 12;
printf("The absolute value of %.2f is %.2f\n",n,fabs(n));
n = -12;
printf("The absolute value of %.2f is %.2f\n",n,fabs(n));
n = 11.563;
printf("The absolute value of %.3f is %.3f\n",n,fabs(n));
n = -1.012;
printf("The absolute value of %.3f is %.3f\n",n,fabs(n));
n = -0.44;
printf("The absolute value of %.2f is %.2f\n",n,fabs(n));
return 0;
}
```

The output of the above program is :

```
The absolute value of 12.00 is 12.00
The absolute value of -12.00 is 12.00
The absolute value of 11.563 is 11.563
The absolute value of -1.012 is 1.012
The absolute value of -0.44 is 0.44
```

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