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fabs

From cppreference.com
< c‎ | numeric‎ | math
 
 
 
Common mathematical functions
Functions
Basic operations
(C99)
(C99)
(C99)
(C99)
(C99)
(C99)(C99)(C99)
Exponential functions
(C99)
(C99)
(C99)
(C99)
Power functions
(C99)
(C99)
Trigonometric and hyperbolic functions
(C99)
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(C99)
Error and gamma functions
(C99)
(C99)
(C99)
(C99)
Nearest integer floating point operations
(C99)(C99)(C99)
(C99)
(C99)(C99)(C99)
Floating point manipulation functions
(C99)(C99)
(C99)
(C99)
Classification
(C99)
(C99)
(C99)
Macro constants
 
Defined in header <math.h>
float       fabsf( float arg );
(since C99)
double      fabs( double arg );
long double fabsl( long double arg );
(since C99)

Computes the absolute value of a floating point value arg.

Contents

[edit] Parameters

arg - floating point value

[edit] Return value

The absolute value of arg (|arg|)

[edit] Example

#include <stdio.h>
#include <math.h>
 
int main()
{
    printf("%.1f\n", fabs(+3.0));
    printf("%.1f\n", fabs(-3.0));
    printf("%.1f\n", fabs(+0.0));
    printf("%.1f\n", fabs(-0.0));
    printf("%.1f\n", fabs(+INFINITY));
    printf("%.1f\n", fabs(-INFINITY));
    printf("%.1f\n", fabs(+NAN));
    printf("%.1f\n", fabs(-NAN));
 
    return 0;
}

Output:

3.0
3.0
0.0
0.0
inf
inf
nan
nan

[edit] See also

computes absolute value of an integral value (|x|)
(function) [edit]
checks if the given number is negative
(function) [edit]