803
Subj : problem with math exp(log(2))
To   : borland.public.cpp.borlandcpp
From : Bostjan Stupica <bostjan.stupica@bankart.si>
Date : Fri Mar 19 2004 08:30 am

Hoj!

I have problem with the following program in step/case 2.

In step 2 I expect the result to be 8 in int and double type of variables.

I tried to compile program in Borland C++, MinGW and gcc (on Linux) and 
get the same result.

Anyone had similar problem???

The program is:
---
#define STRICT  // Strict syntax and field maping
#define WIN32_LEAN_AND_MEAN

/* -----------------< INCLUDE Directives. 
 >---------------------------------- */
#include    <stdio.h>

#include    <math.h>
/* 
-------------------------------------------------------------------------- 
*/

#ifdef __TURBOC__
   #pragma argsused
#endif
//  Function:   main
int main(int argc, char **argv)
{
   // Local variables
   int       i_number;
   long      l_number;
   float     f_num;
   double    f_number;


   // Initialization

   // Output string
   printf("========================================");
   printf("=======================================\n");
   printf("This is TEST program for numeric calculation and typecast.");
   printf("\n");

   // Calculation
   f_number = exp(log(2) * 2);
   i_number = (int) f_number;
   // Output variables
   printf("1.\n");
   printf("Var: %ld <> %.2f", i_number, f_number);
   printf("\n");

   // Calculation
   f_num = exp(log(2) * 3);
   f_number = exp(log(2) * 3);
   i_number = (int) f_number;
   l_number = (long) f_number;
   // Output variables
   printf("2.\n");
   printf("Var: %ld <> %ld <> %.2f <> %.2f", i_number, l_number, f_num, 
f_number);
   printf("\n");

   // Calculation
   f_number = exp(log(2) * 4);
   i_number = (int) f_number;
   // Output variables
   printf("3.\n");
   printf("Var: %ld <> %.2f", i_number, f_number);
   printf("\n");

   // End of program
   return 0;
} // main
---

Regards, BostjanSt
EMail: bostjan<dot>stupica@bankart.si

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