isless
From cppreference.com
| Defined in header <math.h>
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#define isless(x, y) /* implementation defined */
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(since C99) | |
Determines if the floating-point number x is less than the floating-point number y, without setting floating-point exceptions.
Parameters
| x | - | floating-point value |
| y | - | floating-point value |
Return value
Nonzero integral value if x < y, 0 otherwise.
Notes
The built-in operator< for floating-point numbers may raise FE_INVALID if one or both of the arguments is NaN. This function is a "quiet" version of operator<.
Example
Run this code
#include <math.h>
#include <stdio.h>
int main(void)
{
printf("isless(2.0,1.0) = %d\n", isless(2.0, 1.0));
printf("isless(1.0,2.0) = %d\n", isless(1.0, 2.0));
printf("isless(INFINITY,1.0) = %d\n", isless(INFINITY, 1.0));
printf("isless(1.0,NAN) = %d\n", isless(1.0, NAN));
return 0;
}
Possible output:
isless(2.0,1.0) = 0
isless(1.0,2.0) = 1
isless(INFINITY,1.0) = 0
isless(1.0,NAN) = 0
References
- C23 standard (ISO/IEC 9899:2024):
- 7.12.14.3 The isless macro (p: TBD)
- F.10.11 Comparison macros (p: TBD)
- C17 standard (ISO/IEC 9899:2018):
- 7.12.14.3 The isless macro (p: TBD)
- F.10.11 Comparison macros (p: TBD)
- C11 standard (ISO/IEC 9899:2011):
- 7.12.14.3 The isless macro (p: 260)
- F.10.11 Comparison macros (p: 531)
- C99 standard (ISO/IEC 9899:1999):
- 7.12.14.3 The isless macro (p: 241)
See also
(C99) |
checks if the first floating-point argument is greater than the second (function macro) |
C++ documentation for isless
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