islessequal

Header: <math.h>

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

# Declarations

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

(since C99)

# Parameters

# Return value

Nonzero integral value if x <= y, 0 otherwise.

# 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<=.

# Example

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

# See also