fmax, fmaxf, fmaxl
Determine the larger of two specified numeric values.
Syntax
double fmax(
double x,
double y
);
float fmax(
float x,
float y
); //C++ only
long double fmax(
long double x,
long double y
); //C++ only
float fmaxf(
float x,
float y
);
long double fmaxl(
long double x,
long double y
);
#define fmax(X, Y) // Requires C11 or higher
Parameters
x
The first value to compare.
y
The second value to compare.
Return value
If successful, returns the larger of x or y. The value returned is exact, and doesn't depend on any form of rounding.
Otherwise, may return one of the following values:
| Issue | Return |
|---|---|
x = NaN |
y |
y = NaN |
x |
x and y = NaN |
NaN |
This function doesn't use the errors specified in _matherr.
Remarks
Because C++ allows overloading, you can call overloads of fmax that take and return float and long double types. In a C program, unless you're using the <tgmath.h> macro to call this function, fmax always takes and returns a double.
If you use the <tgmath.h> fmax() macro, the type of the argument determines which version of the function is selected. See Type-generic math for details.
Requirements
| Function | C header | C++ header |
|---|---|---|
fmax, fmaxf, fmaxl |
<math.h> | <cmath> or <math.h> |
fmax macro |
<tgmath.h> |
For more compatibility information, see Compatibility.