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Library Function fabs in Math Class in C
Library Function fabs of math.h Header File
In this section, we will discuss about library function fabs in math class which is used in C.The C header file math.h contains the standard math library functions that can be used for performing various mathematical operations. The fabs function returns the absolute value of the number.
Library Function fabs of math.h Header File
- In C programming language the fabs function is included in math.h header file.
- The range of input argument which is passed to fabs function is not limited here as it can be any value from int to float or double but then has to be type casted into double type.
Declaration of fabs function
double fabs(double arg)
Parameters of fabs function
The fabs function accepts a single input argument which is of double type.
| Parameter | Description |
|---|---|
| double value | This value of double function ranges to all positive and negative numbers. |
Return value of fabs function
The fabs function returns the absolute value of the number and it’s type is double.
| Parameter | Return Value |
|---|---|
| Absolute Value | It returns the value in double. |
Implementation of Library Function math.h fabs()
Example 1:
The following code shows the use of fabs function.
#include<stdio.h>
#include<conio.h>
int main()
{
double x, result;
x = -1.5;
result = fabs(x);
printf("|%.2lf| = %.2lf\n", x, result);
x = 11.3;
result = fabs(x);
printf("|%.2lf| = %.2lf\n", x, result);
x = 0;
result = fabs(x);
printf("|%.2lf| = %.2lf\n", x, result);
return 0;
}
Output:
|-1.50| = 1.50 |11.30| = 11.30 |0.00| = 0.00
Example 2:
#include<stdio.h>
#include<conio.h>
int main ()
{
double a = 980;
double b = -1231;
double res;
res = fabs (a);
printf ("The absolute value of %.3lf is %.3lf\n", a, res);
res = fabs (b);
printf ("The absolute value of %.3lf is %.3lf\n", b, res);
return 0;
}
Output:
The absolute value of 980.000 is 980.000 The absolute value of -1231.000 is 1231.000
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