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Showing content from https://cplusplus.com/reference/cmath/islessgreater/ below:

macro

<cmath> <ctgmath>

bool islessgreater (float x      , float y);bool islessgreater (double x     , double y);bool islessgreater (long double x, long double y);

Is less or greater

If one or both arguments are NaN, the function returns false, but no FE_INVALID exception is raised (note that the expression x<y||x>y may raise such an exception in this case).

In C, this is implemented as a macro that returns an int value. The type of both x and y shall be float, double or long double.

In C++, it is implemented with function overloads for each

, each returning a

value.

x, y

Values to be compared.

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/* islessgreater example */
#include <stdio.h>      /* printf */
#include <math.h>       /* islessgreater, log */

int main ()
{
  double result;
  result = log (10.0);

  if (islessgreater(result,0.0))
    printf ("log(10.0) is not zero");
  else
    printf ("log(10.0) is zero");

  return 0;
}

isgreater

Is greater (macro)

isgreaterequal

Is greater or equal (macro)

isless

Is less (macro)

islessequal

Is less or equal (macro)

isunordered

Is unordered (macro)

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