[Dev-C++] numerical error in a simple program

[Luís B. <lf...@ya...>]

When I try to compile this program:

********************************************
#include <stdio.h> // printf
#include <stdlib.h> // system

int main(int argc, char *argv[])
{
  double a;
  a = 0.3333;
  printf( " a = %15.15f\n", a );
  a *= 10;
  printf( " a = %15.15f\n", a );
  a *= 10;
  printf( " a = %15.15f\n", a );
  a *= 10;
  printf( " a = %15.15f\n", a );
  a *= 10;
  printf( " a = %15.15f\n", a );
  system("PAUSE");	
  return 0;
}
********************************************

I get this output:

********************************************
 a = 0.333300000000000
 a = 3.333000000000000
 a = 33.329999999999998
 a = 333.299999999999950
 a = 3332.999999999999500
********************************************

How to avoid this error?
Thank in advance for any response.


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Luís Filipe Delgado Brás
Eng.º Civil
Porto - Portugal
email: lf...@ya...
http://www.fotopt.net/autor.asp?autor=2637
+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=

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