Member Avatar for vinaychalluru

Hi,every one.I am new to C language and there I had tried a program as here and I got an output from what I had expected and hope you will help in this aspect and I have given the program as an attachment for better viewing of it.


thank you
vinaychalluru

format----agency FB----bold-----14;         scriprt ------western

                                                                                          /*MY PROGRAM IS HERE*/

#include<stdio.h>
#include<conio.h>
void main()
{
float a=1.1;
double b=1.1;
if(a==b)
printf("Both are equal");
else
printf("Both of them are not equal");
getch();
}

Actually the output I had expected was to get       " Both are equal " but the output was " Both of them are not equal "

thank you
vinaychalluru
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  • 7 Hours Discussion Span
  • Latest Post Latest Post by Ptolemy
Member Avatar for Ptolemy

It's better to put the code directly in your post if it's short. The problem is that floating-point values aren't always exact, so you can't reliably test for equality. The usual fix for your problem is to do a "close enough" test using the difference of the two values and a suitably small epsilon value:

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

static double floating_epsilon ( int precision )
{
  double result = 0.1;

  while ( --precision >= 0 )
    result /= 10;

  return result;
}

int main ( void )
{
  float a = 1.1;
  double b = 1.1;

  if ( fabs ( a - b ) <= floating_epsilon ( 1 ) )
    printf("Both are equal\n");
  else
    printf("Both of them are not equal\n");

  return 0;
}
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