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    islessgreater

    From cppreference.com
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    Defined in header <math.h> 
    #define islessgreater(x, y) /* implementation defined */
    		(since C99)

    Determines if the floating-point number x is less than or greater 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 || x > y, 0 otherwise.

    Notes

    The built-in operator< and 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 the expression x < y || x > y. The macro does not evaluate x and y twice.

    Example

    Run this code
    #include <math.h>
#include <stdio.h>
 
int main(void)
{
    printf("islessgreater(2.0,1.0)      = %d\n", islessgreater(2.0, 1.0));
    printf("islessgreater(1.0,2.0)      = %d\n", islessgreater(1.0, 2.0));
    printf("islessgreater(1.0,1.0)      = %d\n", islessgreater(1.0, 1.0));
    printf("islessgreater(INFINITY,1.0) = %d\n", islessgreater(INFINITY, 1.0));
    printf("islessgreater(1.0,NAN)      = %d\n", islessgreater(1.0, NAN));
 
    return 0;
}

    Possible output: 

    islessgreater(2.0,1.0)      = 1
islessgreater(1.0,2.0)      = 1
islessgreater(1.0,1.0)      = 0
islessgreater(INFINITY,1.0) = 1
islessgreater(1.0,NAN)      = 0

    References

    • C23 standard (ISO/IEC 9899:2024):
    • 7.12.14.5 The islessgreater macro (p: TBD)
    • F.10.11 Comparison macros (p: TBD)
    • C17 standard (ISO/IEC 9899:2018):
    • 7.12.14.5 The islessgreater macro (p: TBD)
    • F.10.11 Comparison macros (p: TBD)
    • C11 standard (ISO/IEC 9899:2011):
    • 7.12.14.5 The islessgreater macro (p: 261)
    • F.10.11 Comparison macros (p: 531)
    • C99 standard (ISO/IEC 9899:1999):
    • 7.12.14.5 The islessgreater macro (p: 241-242)

    See also

    (C99)
    		 checks if the first floating-point argument is less than the second
    (function macro) [edit]
    (C99)
    		 checks if the first floating-point argument is greater than the second
    (function macro) [edit]
    C++ documentation for islessgreater