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Showing content from https://cplusplus.com/reference/cmath/fmax/ below:

function

fmax

     double fmax  (double x     , double y);      float fmaxf (float x      , float y);long double fmaxl (long double x, long double y);

     double fmax (double x     , double y);      float fmax (float x      , float y);long double fmax (long double x, long double y);     double fmax (Type1 x      , Type2 y);       // additional overloads

Maximum value

Returns the larger of its arguments: either x or y.

If one of the arguments in a NaN, the other is returned.

Header

<tgmath.h>

provides a type-generic macro version of this function.

Additional overloads

are provided in this header (

<cmath>

) for other combinations of

arithmetic types

(

Type1

and

Type2

): These overloads effectively cast its arguments to

double

before calculations, except if at least one of the arguments is of type

long double

(in which case both are casted to

long double

instead).

Parameters

x, y: Values among which the function selects a maximum.

Return Value The maximum numeric value of its arguments.

Example

/* fmax example */
#include <stdio.h>      /* printf */
#include <math.h>       /* fmax */

int main ()
{
  printf ("fmax (100.0, 1.0) = %f\n", fmax(100.0,1.0));
  printf ("fmax (-100.0, 1.0) = %f\n", fmax(-100.0,1.0));
  printf ("fmax (-100.0, -1.0) = %f\n", fmax(-100.0,-1.0));
  return 0;
}

Output:

fmax (100.0, 1.0) = 100.000000
fmax (-100.0, 1.0) = 1.000000
fmax (-100.0,-1.0) = -1.000000