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charting using for loops??

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charting using for loops??

 
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  #1
Oct 11th, 2008
im making a program where i will displaying the sales of each store using a sales bar chart.

user will input sales for each store.


after the input, a sales chart must be displayed using a for loop, with each '*' = $100 in sales

question: how can i make the * worth $100 so when ie: sales are $400 for the day, 4 * will be displayed? this is the trouble i am having with my for loop!

this is what i have so far.

C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main()
  5. {
  6. 	double sale1, sale2, sale3, sale4, sale5;
  7. 	double total;
  8. 	int row;
  9.  
  10. 	cout << "Enter today's sale for store 1: ";
  11. 	cin >> sale1;
  12. 	cout << "Enter today's sale for store 2: ";
  13. 	cin >> sale2;
  14. 	cout << "Enter today's sale for store 3: ";
  15. 	cin >> sale3;
  16. 	cout << "Enter today's sale for store 4: ";
  17. 	cin >> sale4;
  18. 	cout << "Enter today's sale for store 5: ";
  19. 	cin >> sale5;
  20.  
  21. 	cout << endl;
  22. 	cout << "SALES BAR CHART" << endl;
  23.  
  24. 	for (row = 0; row < 5; row++)
  25. 	{
  26.  
  27. 	cout << '*';	
  28. 	cout << endl;
  29.  
  30. 	}
  31.  
  32.  
  33.  
  34.  
  35. 	return 0;
  36. }

thanks in advance!!
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Re: charting using for loops??

 
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  #2
Oct 11th, 2008
So you want to print '*' n times, where n is a number of hundreds of dollars?
$300 - n = 3
$630 - n = 6
$690 - n = 6? (or n = 7?)

If so, divide each sale by n and store it in int (in that way $630 will end up being 6.3, but stored in int: 6!)

Then add another loop inside row-loop that will print cout<<'*' for n times.
Like this pseudocode:
C++ Syntax (Toggle Plain Text) 
  1. for rows loop
  2.      for n loop
  3.           print *
  4.      end n loop
  5.      print newline
  6. end rows loop
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Re: charting using for loops??

 
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  #3
Oct 11th, 2008
thanks

so n should be = 100, making the statement true???
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Re: charting using for loops??

 
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  #4
Oct 11th, 2008
i followed your advice, but i feel like this code has some errors:

C++ Syntax (Toggle Plain Text) 
  1. cout << "SALES BAR CHART" << endl;
  2.  
  3. 	for (row = 0; row < 5; row++);
  4. 	{
  5.  
  6. 	cout << '*';	
  7. 	cout << endl;
  8.  
  9. 	}
  10.  
  11. 	for (n = 100)
  12. 	{
  13.  
  14. 	sale1 /= n;
  15. 	sale2 /= n;
  16. 	sale3 /= n;
  17. 	sale4 /= n;
  18. 	sale5 /= n;
  19.  
  20.  
  21. 	}
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Re: charting using for loops??

 
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  #5
Oct 11th, 2008
btw this is how it should be on the console

store 1: $500
store 2: $600

chart:
(each * = $100)
store 1: *****
store 2: ******

etc.
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Re: charting using for loops??

 
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  #6
Oct 12th, 2008
No, no...
n := sale/100;
And then INSIDE for loop that counts from 0 to n insert cout<<'*';
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Re: charting using for loops??

 
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  #7
Oct 12th, 2008
how do i do that??
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Re: charting using for loops??

 
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  #8
Oct 12th, 2008
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Originally Posted by afg_91320 View Post
i followed your advice, but i feel like this code has some errors:

cout << "SALES BAR CHART" << endl;

  
 
   
 
 
	for (row = 0; row < 5; row++);
	{

	cout << '*';	
	cout << endl;

	}
  
 
 
	for (n = 100)
	{
	
	sale1 /= n;
	sale2 /= n;
	sale3 /= n;
	sale4 /= n;
	sale5 /= n;


	}
is the text in bold right??
Last edited by afg_91320; Oct 12th, 2008 at 9:56 pm.
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Re: charting using for loops??

 
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  #9
Oct 13th, 2008
Using dynamic memory allocation, you can come up with this:
C++ Syntax (Toggle Plain Text) 
  1. #include <iostream>
  2. #include <alloc.h>
  3.  
  4. using namespace std;
  5.  
  6. int main()
  7. {
  8.   int nstores, *sales;
  9.  
  10.   cout << "SALES BAR CHART" << endl;
  11.   cout << "---------------" << endl;
  12.   cout << "Enter the number of stores: ";
  13.   cin >> nstores;
  14.  
  15.   sales = (int *) malloc(sizeof(int)*nstores);
  16.  
  17.   for(int i=0; i<nstores; i++)
  18.   {
  19.     cout << "Enter today's sales for store number " << i+1 << ": ";
  20.     cin >> sales[i];
  21.     sales[i] /= 100;
  22.   }
  23.   cout << "\n\n";
  24.   for( int i=0; i<nstores; i++)
  25.   {
  26.     cout << "Store " << i+1 << ": ";
  27.     for (int j=0; j<sales[i]; j++)
  28.       cout << '*';
  29.     cout << "\n";
  30.   }
  31.   system("pause>nul");
  32.   return 0;
  33. }

It's 3:18am and I'm tired. PM me if you have any questions. I don't have problems adding you to msn either.
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Re: charting using for loops??

 
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  #10
Oct 13th, 2008
If we want to go dynamic, why not use new instead of malloc()?
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