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# islessgreater

From cppreference.com
< c‎ | numeric‎ | math

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.

### [edit] Parameters

x | - | floating point value
y | - | floating point value

### [edit] Return value

Nonzero integral value if x < y || x > y, ​0​ otherwise.

### [edit] 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.

### [edit] Example

Run this code

    #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

### [edit] 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)

### [edit] See also

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

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