Common mathematical functions| Functions | | Basic operations | | | | Maximum/minimum operations | | | | Exponential functions | | | | Power functions | | | | Trigonometric and hyperbolic functions | | |
| | Nearest integer floating-point | | | | Floating-point manipulation | | | | Narrowing operations | | | | Quantum and quantum exponent | | | | Decimal re-encoding functions | | | | Total order and payload functions | | | | Classification | | |
| | Error and gamma functions | | | | Types | | | | Macro constants | | Special floating-point values | | | | Arguments and return values | | (C99)(C99)(C99)(C99)(C99) |
| | (C23)(C23)(C23)(C23)(C23) |
| | Error handling | | | | Fast operation indicators | | |
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float fmaxf(float x,float y); | (1) | (since C99) |
double fmax(double x,double y); | (2) | (since C99) |
longdouble fmaxl(longdouble x,longdouble y); | (3) | (since C99) |
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#define fmax( x, y ) | (4) | (since C99) |
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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 typelongdouble,fmaxl is called. Otherwise, if any argument has integer type or has typedouble,fmax is called. Otherwise,fmaxf is called.
[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 inmath_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.
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 <math.h>#include <stdio.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) = 2.000000fmax(-Inf,0) = 0.000000fmax(NaN,-1) = -1.000000
[edit]References
- C23 standard (ISO/IEC 9899:2024):
- 7.12.12.2 The fmax functions (p: TBD)
- 7.25 Type-generic math <tgmath.h> (p: TBD)
- F.10.9.2 The fmax functions (p: TBD)
- 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] |
| determines smaller of two floating-point values
(function)[edit] |
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