The current exchange rate

This is a discussion on The current exchange rate within the C Programming forums, part of the General Programming Boards category; hi all i have an error message in my code .. the question is : write a C program that ...

  1. #1
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    The current exchange rate

    hi all


    i have an error message in my code ..
    the question is :
    write a C program that asks for input as US dollars and uses the function to display the output as GBP sterling. The current exchange rate is 1 GBP to 1.5207 USD.

    if anyone could help me with it


    my code :

    Code:
    #include <stdio.h>
             
    int main(void)
    {
     int input = 0;
       do
       {
          printf( "\nPlease enter a dollar amount to exchange to GBP: " );
          scanf( "%d", &input );
    
          if ( input > 0 )
          
                   printf ("Great Britian: = "%f"/ 1.5207\n",GBP);
          
                } while ( input< 20 );
                
             return 0;
    }
    i asked to do it with this line but i coudn't

    Code:
      double gbp_to_usd( double );

    thanks

  2. #2
    Registered User linuxdude's Avatar
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    You have to create a function and call it:
    Code:
    double gbp_to_usd( double in) {
       // Your code here
    }
    Then you have to call it:
    Code:
                   printf ("Great Britian: = %f\n",gbp_to_usd(input));
    but I think you have something backwards. You are converting from usd to gbp, but the function is called gbp_to_usd?
    EDIT: Also check your printf statement. It has closing " when it shouldn't. Do you mean \"

  3. #3
    Registered User Swarvy's Avatar
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    In your post, you try and do it using the line of code: double gbp_to_usd( double );

    Have you written that function?

    You haven't defined the variable "GBP", from what I can tell, that is meaningless at the moment.

    edit: lol. I was too slow :P

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    well i am trying to do it as u said but still having errors

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    Quote Originally Posted by Swarvy View Post
    In your post, you try and do it using the line of code: double gbp_to_usd( double );

    Have you written that function?

    You haven't defined the variable "GBP", from what I can tell, that is meaningless at the moment.

    edit: lol. I was too slow :P

    No i asked to do it with that function ..

  6. #6
    Registered User linuxdude's Avatar
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    Well what have you tried. This isn't a difficult problem. Post what you have tried for converting. We don't do work here for others. We are here to help and give advice.

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    this is what i have done so far and it works


    Code:
     double gbp_to_usd( double );
    
    int main( void )
    {
       double usd = 0.0;
       scanf( "%lf", &usd );
       printf( "%.2lf usd is equivalent to %.2lf gbp", usd, gbp_to_usd( usd ) );
    }
    
    double gbp_to_usd( double usd )
    {
       return ( usd * 1.5207 );
    }

    thanks

  8. #8
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    Quote Originally Posted by BB.BB View Post
    this is what i have done so far and it works


    Code:
     double gbp_to_usd( double );
    
    int main( void )
    {
       double usd = 0.0;
       scanf( "%lf", &usd );
       printf( "%.2lf usd is equivalent to %.2lf gbp", usd, gbp_to_usd( usd ) );
    }
    
    double gbp_to_usd( double usd )
    {
       return ( usd * 1.5207 );
    }

    thanks
    You forgot the part of the code where if %.2lf goes past the hundreth decimal pace it sends the remainder (.00XXXXX) to your personal bank account.

  9. #9
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    Quote Originally Posted by BB.BB View Post
    this is what i have done so far and it works...
    I don't think so. Your calculation is still backwards.

    1 British Pound Sterling = 1.5207 US Dollar (you said)

    To convert US to pound, you'd do US$ / 1.5207.

  10. #10
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    same solution with functions
    Attached Files Attached Files

  11. #11
    Registered User NeonBlack's Avatar
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    Quote Originally Posted by strickyc View Post
    You forgot the part of the code where if %.2lf goes past the hundreth decimal pace it sends the remainder (.00XXXXX) to your personal bank account.
    *applause*
    I copied it from the last program in which I passed a parameter, which would have been pre-1989 I guess. - esbo

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