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fmax, fmaxf, fmaxl

From cppreference.com
< c‎ | numeric‎ | math
 
 
 
Common mathematical functions
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fmax
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Defined in header <math.h>
float       fmaxf( float x, float y );
(1) (since C99)
double      fmax( double x, double y );
(2) (since C99)
long double fmaxl( long double x, long double y );
(3) (since C99)
Defined in header <tgmath.h>
#define fmax( x, y )
(4) (since C99)
1-3) Returns the larger of two floating point arguments, treating NaNs as missing data (between a NaN and a numeric value, the numeric value is chosen).
4) Type-generic macro: If any argument has type long double, fmaxl is called. Otherwise, if any argument has integer type or has type double, fmax is called. Otherwise, fmaxf is called.

Contents

[edit] Parameters

x, y - floating point values

[edit] Return value

If successful, returns the larger of two floating point values. The value returned is exact and does not depend on any rounding modes.

[edit] Error handling

This function is not subject to any of the error conditions specified in math_errhandling.

If the implementation supports IEEE floating-point arithmetic (IEC 60559),

  • If one of the two arguments is NaN, the value of the other argument is returned.
  • Only if both arguments are NaN is NaN returned.

[edit] Notes

This function is not required to be sensitive to the sign of zero, although some implementations additionally enforce that if one argument is +0 and the other is -0, then +0 is returned.

[edit] Example

#include <stdio.h>
#include <math.h>
 
int main(void)
{
    printf("fmax(2,1)    = %f\n", fmax(2,1));
    printf("fmax(-Inf,0) = %f\n", fmax(-INFINITY,0));
    printf("fmax(NaN,-1) = %f\n", fmax(NAN,-1));
}

Output:

fmax(2,1)    = 2.000000
fmax(-Inf,0) = 0.000000
fmax(NaN,-1) = -1.000000

[edit] References

  • C17 standard (ISO/IEC 9899:2018):
  • 7.12.12.2 The fmax functions (p: 188)
  • 7.25 Type-generic math <tgmath.h> (p: 397)
  • F.10.9.2 The fmax functions (p: 386)
  • C11 standard (ISO/IEC 9899:2011):
  • 7.12.12.2 The fmax functions (p: 257-258)
  • 7.25 Type-generic math <tgmath.h> (p: 373-375)
  • F.10.9.2 The fmax functions (p: 530)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.12.12.2 The fmax functions (p: 238-239)
  • 7.22 Type-generic math <tgmath.h> (p: 335-337)
  • F.9.9.2 The fmax functions (p: 466)

[edit] See also

checks if the first floating-point argument is greater than the second
(function macro) [edit]
(C99)(C99)(C99)
determines smaller of two floating-point values
(function) [edit]