fabsf 函数

返回浮点的绝对值。

 

AME

     fabs -- floating-point absolute value function

 

SYNOPSIS

     #include <math.h>

 

     double

     fabs(double x);

 

     long double

     fabsl(long double x);

 

     float

     fabsf(float x);

 

DESCRIPTION

     The fabs() functions compute the absolute value of a floating-point number x.

 

SPECIAL VALUES

     fabs(+-_) returns 0.

 

     fabs(+-infinity) returns +infinity.

 

SEE ALSO

     abs(3), ceil(3), floor(3), rint(3), math(3)

 

STANDARDS

     The fabs() functions conform to ISO/IEC 9899:1999(E).