isunordered
From cppreference.com
| Defined in header
<math.h>
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||
| #define isunordered(x, y) /* implementation defined */
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(since C99) | |
Determines if the floating point numbers x and y are unordered, that is, one or both are NaN and thus cannot be meaningfully compared with each other.
Contents |
[edit] Parameters
| x | - | floating point value |
| y | - | floating point value |
[edit] Return value
Nonzero integral value if either x or y is NaN, 0 otherwise.
[edit] Example
Run this code
#include <stdio.h> #include <math.h> int main(void) { printf("isunordered(NAN,1.0) = %d\n", isunordered(NAN,1.0)); printf("isunordered(1.0,NAN) = %d\n", isunordered(1.0,NAN)); printf("isunordered(NAN,NAN) = %d\n", isunordered(NAN,NAN)); printf("isunordered(1.0,0.0) = %d\n", isunordered(1.0,0.0)); return 0; }
Possible output:
isunordered(NAN,1.0) = 1 isunordered(1.0,NAN) = 1 isunordered(NAN,NAN) = 1 isunordered(1.0,0.0) = 0
[edit] See also
| (C99)
|
classifies the given floating-point value (function) |
| (C99)
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checks if the given number is NaN (function) |
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C++ documentation for isunordered
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