C Data Type Functions - C islessequal

Returns whether x is less than or equal to y.

Prototype C99

The C99 prototype is listed as follows.

 
          macro islessequal(x,y)

Prototype C++11

The C++11 prototype is listed as follows.

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

Parameter

This function has the following parameter.

x, y: Values to be compared.

Return

The same as (x)<=(y): true (1) if x is less than or equal to y. false (0) otherwise.

Example


#include <stdio.h> /* printf */
#include <math.h> /* islessequal, log */
//from   w  w  w .j  a  va 2 s.c  o  m
int main (){
  double result;
  result = log (10.0);

  if (islessequal(result,0.0))
    printf ("log(10.0) is not positive");
  else
    printf ("log(10.0) is positive");

  return 0;
}

The code above generates the following result.

Example 2


#include <stdio.h>
#include <math.h>
 //from   ww w  . j  av a  2 s  .  c o m
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;
}

The code above generates the following result.