US dollar amount, the result is all zeros.

Pinkyy · #1 08-Sep-2005, 14:12

This is what I basically need. Can someone please help me? I'm lost.

Write a C program that displays a title, "Currency Conversion," and then display the names of five currencies and their equivalents to $100 US dollars. The program must use named constants (for any value that remains constant), variables and equations. The program should calculate the equivalency of $100 US dollars to the Euro, Japanese Yen, UK Pound, Germany Deutsche Marc, French Franc. For purposes of this exercise, use the following conversion factors:

1 US dollar = 0.926698 Euro
1 US dollar = 6.07874 Franc
1 US dollar = 120.300 Yen
1 US dollar = 1.81246 Deutsche Marc
1 US dollar = 0.619579 Pound

Once you have calculated the equivalency of $100 US dollars for each currency (using equations with variables and named constants), display the results on the screen. Be sure to label each result with the correct currency name. Before you display the 5 results, you should display "$100 US dollars is equivalent to:".

I also need the source code for this program. Thanks in advance to anyone that can help me. This is what I have so far.

CPP / C++ / C Code:

#include <stdio.h> 
 
 #define EURO_DOLLAR_FACTOR 0.926698 
 #define FRANC_DOLLAR_FACTOR 6.07874 
 #define MARC_DOLLAR_FACTOR 1.81246 
 #define POUND_DOLLAR_FACTOR 0.619579 
 #define YEN_DOLLAR_FACTOR 120.300 
 #define US_DOLLAR_VALUE 100.00 
 
 float ConvertCurrency(float Factor, float Dollars); 
 
 void main() 
 { 
     
     
     printf("\t\t\t\t Currency Conversion\n"); 
     
     printf("\n\nEnter your first name..."); 
     getch();    
          
     printf("\n"); 
     
     printf("100 US dollars are equal to %f euros\n", 
 ConvertCurrency(EURO_DOLLAR_FACTOR,US_DOLLAR_VALUE)); 
     printf("100 US dollars are equal to %f francs\n", 
 ConvertCurrency(FRANC_DOLLAR_FACTOR,US_DOLLAR_VALUE)); 
     printf("100 US dollars are equal to %f marcs\n", 
 ConvertCurrency(MARC_DOLLAR_FACTOR,US_DOLLAR_VALUE)); 
     printf("100 US dollars are equal to %f pounds\n", 
 ConvertCurrency(POUND_DOLLAR_FACTOR,US_DOLLAR_VALUE)); 
     printf("100 US dollars are equal to %f yens\n", 
 ConvertCurrency(YEN_DOLLAR_FACTOR,US_DOLLAR_VALUE)); 
     /************************************************* 
      * Prompt user to press ENTER key to end program * 
      *************************************************/ 
     printf("\n\nPress Enter key to end..."); 
     getch(); 
 } 
 
 // 
 // Function ConvertCurrency returns the value of Factor times Dollars 
 // 
 float ConvertCurrency(float Factor, float Dollars) 
 { 
     float Result = 0.0; 
 
     Result = Factor * Dollars; 
     return(Result); 
 }

kobi_hikri · #2 08-Sep-2005, 14:25

Where are you lost ?
What is the problem ? I can see that the application is almost finished.
What errors are you getting ?

Kobi Hikri.

kobi_hikri · #3 08-Sep-2005, 14:42

Quote:

Originally Posted by Pinkyy

This is what I basically need. Can someone please help me? I'm lost.

1. Well, for starters, Your function ConvertCurrency is good, and I didn't change it.
2. I did some indentation and removed your

CPP / C++ / C Code:

getch();

calls as I don't understand their purpose.
3. Why do you ask for student name but dont read it (e.g with scanf) ?
4. You had some errors in places where you wrote your constant names (syntax errors), This is something you shoud get used to check.

Basically a good work :-P

This is the code (your code) I fixed. Try to continue on your own.
Post any problem.

CPP / C++ / C Code:


#include <stdio.h> 

#define EURO_DOLLAR_FACTOR		0.926698 
#define FRANC_DOLLAR_FACTOR		6.07874 
#define MARC_DOLLAR_FACTOR		1.81246 
#define POUND_DOLLAR_FACTOR		0.619579 
#define YEN_DOLLAR_FACTOR		120.300 
#define US_DOLLAR_VALUE			100.00 

float ConvertCurrency(float Factor, float Dollars); 

void main() 
{ 

	printf("\t\t\t\t Currency Conversion\n"); 
	printf("\n"); 

	printf("100 US dollars are equal to %f euros\n", 
	ConvertCurrency(EURO_DOLLAR_FACTOR,US_DOLLAR_VALUE )); 
	printf("100 US dollars are equal to %f francs\n", 
	ConvertCurrency(FRANC_DOLLAR_FACTOR,US_DOLLAR_VALUE)); 
	printf("100 US dollars are equal to %f marcs\n", 
	ConvertCurrency(MARC_DOLLAR_FACTOR,US_DOLLAR_VALUE )); 
	printf("100 US dollars are equal to %f pounds\n", 
	ConvertCurrency(POUND_DOLLAR_FACTOR,US_DOLLAR_VALUE)); 
	printf("100 US dollars are equal to %f yens\n", 
	ConvertCurrency(YEN_DOLLAR_FACTOR,US_DOLLAR_VALUE) ); 
	/************************************************* 
	* Prompt user to press ENTER key to end program * 
	*************************************************/ 
	printf("\n\nPress Enter key to end..."); 
} 

// 
// Function ConvertCurrency returns the value of Factor times Dollars 
// 
float ConvertCurrency(float Factor, float Dollars) 
{ 
	float Result = 0.0; 
	Result = Factor * Dollars; 
	return(Result); 
}

Best regards,
Kobi Hikri.

Pinkyy · #4 08-Sep-2005, 15:32

Thanks so much for your help!.. I really appreciate it! What is wrong is that when I go to put in a US dollar amount, the result is all zeros 000.

kobi_hikri · #5 08-Sep-2005, 15:37

Quote:

Originally Posted by Pinkyy

Thanks so much for your help!.. I really appreciate it! What is wrong is that when I go to put in a US dollar amount, the result is all zeros 000.

Give me an example, I don't understand where you put the US dollar amount.

Kobi Hikri.

Pinkyy · #6 12-Sep-2005, 07:39

to be honest I got off to a the wrong start in this class and really do not understand these formulas at all. I'm still in the book trying to teach myself, however I have another assignment that's due this friday that is a piggyback off of what has already been done. I would really appreciate it if you could assist me..... This is what I have to do....

Expand the “Currency Conversion” program to have a menu that allows the user to choose to which currency they wish to convert the US dollar amount. The program should loop back to the menu after each conversion until the user enters a value to exit the program. The program should display the "Currency Conversion" title, ask user for his name, ask user for US Dollar amount to convert (including name in the prompt), and then display a menu with the 5 conversion options. Once user picks a valid option, the program outputs a message with both the US dollar and equivalent amounts including the name of the currencies and only displaying two decimal places.

The program must contain at least one function other than main(). Insert preambles and comments in the program to document the program internally. Create a design flow chart (Word or PowerPoint format) for the program using the flow chart symbols discussed in class. Submit the flow chart and the source code of the program, each as separate attachments. Post to the Assignments Newsgroup on Friday. (15%)

This was the original assignment

Write a C program that displays a title, "Currency Conversion," and then display the names of five currencies and their equivalents to $100 US dollars. The program must use named constants (for any value that remains constant), variables and equations. The program should calculate the equivalency of $100 US dollars to the Euro, Japanese Yen, UK Pound, Germany Deutsche Marc, French Franc. For purposes of this exercise, use the following conversion factors:

1 US dollar = 0.926698 Euro
1 US dollar = 6.07874 Franc
1 US dollar = 120.300 Yen
1 US dollar = 1.81246 Deutsche Marc
1 US dollar = 0.619579 Pound

Once you have calculated the equivalency of $100 US dollars for each currency (using equations with variables and named constants), display the results on the screen. Be sure to label each result with the correct currency name. Before you display the 5 results, you should display "$100 US dollars is equivalent to:".

Insert preambles and comments in the program to document the program internally. Create a design flow chart (Word or PowerPoint format) for the program using the flow chart symbols discussed in class. Submit the flow chart and the source code of the program, each as separate attachments.

Thanks in advance for any assistance you can give me. I just wish I knew more about this stuff

Quote:

Originally Posted by kobi_hikri

Give me an example, I don't understand where you put the US dollar amount.

Kobi Hikri.

cable_guy_67 · #7 12-Sep-2005, 07:55

Pinkyy,

You need to post what you have working so far. There are many different ways to do any of these tasks. It's the one you are working on that we need to know about.

Kobi cleaned up your code, did that one compile and work the way you thought it would? Since you say that it is a piggyback of the first assignment you should have some of you project already done.

Show us where you stand and then people will help you from there.

Mark

Pinkyy · #8 12-Sep-2005, 08:10

That formula worked, however I was not able to view it too long because I didn't know where to input the getchar statement. I'll give you what kobi gave me, as well as another code that I have. I can't thank you enough guys, really..

Kobi's code:

CPP / C++ / C Code:

#include <stdio.h> 

#define EURO_DOLLAR_FACTOR		 		 0.926698 
#define FRANC_DOLLAR_FACTOR		 		 6.07874 
#define MARC_DOLLAR_FACTOR		 		 1.81246 
#define POUND_DOLLAR_FACTOR		 		 0.619579 
#define YEN_DOLLAR_FACTOR		 		 120.300 
#define US_DOLLAR_VALUE		 		 		 100.00 

float ConvertCurrency(float Factor, float Dollars); 

void main() 
{ 

		 printf("\t\t\t\t Currency Conversion\n"); 
		 printf("\n"); 

		 printf("100 US dollars are equal to %f euros\n", 
		 ConvertCurrency(EURO_DOLLAR_FACTOR,US_DOLLAR_VALUE )); 
		 printf("100 US dollars are equal to %f francs\n", 
		 ConvertCurrency(FRANC_DOLLAR_FACTOR,US_DOLLAR_VALUE)); 
		 printf("100 US dollars are equal to %f marcs\n", 
		 ConvertCurrency(MARC_DOLLAR_FACTOR,US_DOLLAR_VALUE )); 
		 printf("100 US dollars are equal to %f pounds\n", 
		 ConvertCurrency(POUND_DOLLAR_FACTOR,US_DOLLAR_VALUE)); 
		 printf("100 US dollars are equal to %f yens\n", 
		 ConvertCurrency(YEN_DOLLAR_FACTOR,US_DOLLAR_VALUE) ); 
		 /************************************************* 
		 * Prompt user to press ENTER key to end program * 
		 *************************************************/ 
		 printf("\n\nPress Enter key to end..."); 
} 

// 
// Function ConvertCurrency returns the value of Factor times Dollars 
// 
float ConvertCurrency(float Factor, float Dollars) 
{ 
		 float Result = 0.0; 
		 Result = Factor * Dollars; 
		 return(Result); 
}





[b]This is the other extended code I have also[/b] 


/*include the library*/
#include <stdio.h>
/*define the five currencies used for the conversion*/
#define Currency1 0.58
#define Currency2 2.50
#define Currency3 3.69
#define Currency4 21.00
#define Currency5 1.75
/*function prototyping*/
void menu (int *);
float calculateConversion(int, float);
/*main function of the program*/
int main()
{
     /*declare variables*/
     float us;
     float conversion;
     int choice;
     /*call user selection menu by reference*/
     menu(&choice);
     /*prompt user to enter amount of US to convert*/
     printf("Please enter an amount in US Dolalrs to convert: $");
     /*store user entry into memory*/;
     scanf("%f",us);
     /*call conversion function by value*/
     calculateConversion (choice, us);
     /*print results of conversion*/
     printf("The amount of that currency in US Dollars is: $%.2f\n", conversion);
     /*display results*/
     getchar();
     /*terminate program*/
     return 0;
}
/*function definition by reference*/
void menu(int *CHOICE)
{
     /*local variables for menu()*/
     int choice;
     /*show options to user*/
     printf("Welcome to the currency conversion program\n");
     printf("Press number 1 to 5 to select a currency to convert\n");
     printf("Press [1] for Pounds\n");
     printf("Press [2] for Deutchmarks\n");
     printf("Press [3] for Francs\n");
     printf("Press [4] for Pesetas\n");
     printf("Press [5] for Canadian Dollars\n");
     /*store choice in memory*/
     scanf("%d", &choice);
     /*set value of referenced variable*/
     *CHOICE = choice;
}
/*function definition by value*/
float calculateConversion(int CHOICE, float us)
{
   /*local variable for conversion*/
   float conversion;
   /*switch to user the case selected by user in reference funtion*/
   switch (CHOICE)
     {
       case 1:
            conversion=Currency1*us;
            break;
       case 2:
            conversion=Currency2*us;
            break;
       case 3:
            conversion=Currency3*us;
            break;
       case 4:
            conversion=Currency4*us;
            break;
       case 5:
            conversion=Currency5*us;
            break;
     }
/*returns the new value to the main function*/
return conversion;
}

Quote:

Originally Posted by cable_guy_67

Pinkyy,

You need to post what you have working so far. There are many different ways to do any of these tasks. It's the one you are working on that we need to know about.

Kobi cleaned up your code, did that one compile and work the way you thought it would? Since you say that it is a piggyback of the first assignment you should have some of you project already done.

Show us where you stand and then people will help you from there.

Mark

cable_guy_67 · #9 12-Sep-2005, 08:17

Pinkyy,

Go back and edit your post putting code tags around it. It is impossible to read otherwise.

Instructions in This Thread. You have a little bit of time to do it before your edit time expires. Once you see how, hit edit, add the code tags and we'll go from there.

Thanks,
Mark

The problem is that sometimes minor changes get made to your code when it is not tagged that make it hard to help.

cable_guy_67 · #10 12-Sep-2005, 08:41

Ok, after a little formatting when I compile your code using gcc cygwin version on W2K I get the following.

Code:

$ gcc -Wall curr_convert.c -s -o CurrConvert
curr_convert.c: In function `main':
curr_convert.c:30: warning: format argument is not a pointer (arg 2)

then running it

Code:

$ CurrConvert
Welcome to the currency conversion program
Press number 1 to 5 to select a currency to convert
Press [1] for Pounds
Press [2] for Deutchmarks
Press [3] for Francs
Press [4] for Pesetas
Press [5] for Canadian Dollars
5
Please enter an amount in US Dolalrs to convert: $1

Then it goes away never to return ...

Guess what, Your turn. :-)

Mark

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US dollar amount, the result is all zeros.

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