isless - cppreference.com (original) (raw)

| | | | | --------------------------------------------------- | | ----------- | | #define isless(x, y) /* implementation defined */ | | (since C99) |

Determines if the floating-point number x is less than the floating-point number y, without setting floating-point exceptions.

[edit] Parameters

x	-	floating-point value
y	-	floating-point value

[edit] Return value

Nonzero integral value if x < y, 0 otherwise.

[edit] 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<.

[edit] Example

#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

[edit] References