islessgreater

From cppreference.com
< c‎ | numeric‎ | math
 
 
 
Common mathematical functions
Functions
Basic operations
(C99)
(C99)
(C99)
(C99)(C99)(C99)(C23)
Maximum/minimum operations
Exponential functions
(C23)
(C99)
(C99)
(C23)
(C23)
(C99)
(C99)(C23)
(C23)
(C23)
Power functions
(C99)
(C23)
(C23)
(C99)
(C23)
(C23)
Trigonometric and hyperbolic functions
(C23)
(C23)
(C23)
(C23)
(C99)
(C99)
(C99)
Error and gamma functions
(C99)
(C99)
(C99)
(C99)
Nearest integer floating-point operations
(C99)(C99)(C99)
(C99)
(C99)(C99)(C99)
(C23)(C23)(C23)(C23)
Floating-point manipulation functions
(C99)(C99)
(C99)(C23)
(C99)
Narrowing operations
(C23)
(C23)
(C23)
(C23)
(C23)
(C23)
Quantum and quantum exponent functions
Decimal re-encoding functions
Total order and payload functions
Classification
(C99)
(C99)
(C99)
(C23)
(C99)
islessgreater
(C99)
(C23)
Types
Macro constants
Special floating-point values
(C99)(C23)
Arguments and return values
Error handling
 
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

#include <stdio.h>
#include <math.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

  • 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)
checks if the first floating-point argument is greater than the second
(function macro)