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Showing content from https://en.cppreference.com/w/cpp/algorithm/../../cpp/../c/symbol_index/../numeric/math/isless.html below:

isless - cppreference.com

#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
[edit] See also

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