C Language: fabs function(Absolute Value of Floating-Point Number)

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C Programming allows us to perform mathematical operations through the functions defined in header file. The header file contains various methods for performing mathematical operations such as sqrt(), pow(), ceil(), floor() etc.

C Math Functions

In the C Programming Language, the fabs function returns the absolute value of a floating-point number.

Syntax

The syntax for the fabs function in the C Language is:




double fabs(double x);


Parameters or Arguments

The value to convert to an absolute value.

Returns

The fabs function returns the absolute value of a floating-point number represented by x.

Required Header

In the C Language, the required header for the fabs function is:




#include <math.h>


Applies To

In the C Language, the fabs function can be used in the following versions:

  • ANSI/ISO 9899-1990

fabs Example




/* Example using fabs by c programming */

#include <stdio.h>
#include <math.h>

int main(int argc, const char * argv[])
{
    /* Define temporary variables */
    double value;
    double result;

    /* Assign the value we will find the fabs of */
    value = -2.1;

    /* Calculate the absolute value of value */
    result = fabs(value);

    /* Display the result of the calculation */
    printf("The Absolute Value of %f is %f\n", value, result);

    return 0;
}


When compiled and run, this application will output:

The Absolute Value of -2.100000 is 2.100000




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