islessgreater

Header: <math.h>

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

# Declarations

#define islessgreater(x, y) /* implementation defined */

(since C99)

# 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

#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;
}