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Problems with for loop to output diamond shape

Posted on 2007-12-05
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Last Modified: 2012-06-21
I am doing this exercise to output a diamond entering a size. I have messed around with this using a odd and a positive and didn't like that way of doing it. So I have been trying to get it to enter the size of the middle of the shape. What is wrong with my for loop it displays it all wrong.


#include <iostream>
#include <iomanip>
 
using namespace std;
 
int main()
{
 
	int size;
 
	cout << "Enter a size of the middle of the diamond: ";
	cin >> size;
	cout << endl;
 
 for (int i = 1; i < size; i = i + 1)
 {
   cout << setw(size);
    for (int j = 0 ; j < i; j++)
     cout << "* ";
       cout << endl;
        --size;
        }
          for (int i = 1; i < 4; i = i + 1)
        {
                cout << setw(size + 2);
                 for (int j = 4 ; j > i; j--)
                  cout << "* ";
                   cout << endl;
                    ++size;
        }
}

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Question by:jschmuff
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3 Comments
 
LVL 55

Accepted Solution

by:
Jaime Olivares earned 350 total points
ID: 20416946
some comments:
to print a diamond you will need a main loop from 0 to size-1:
for (int i=0; i<size; i++)

then you will need two loops inside, one to print spaces, and another loop to print the diamond
Looking for the diamond below, size = 9
So, you will need to deduce 2 equations:
1) calculate the white spaces, based on i
2) calculate the diamond marks, based on i

in the example first space is 4 and body is 1
then space decrements and body increments

when i = (size-1)/2, then body = size, and space = 0
I would use something like:
body = abs(i-(size-1)/2+1)
space = abs((size-1)/2 - i)

to write the space or body, would be simpler to print char by char, like this:
for (j=0; j<body; j++)
     cout << '#';

well, hope all this information will be enough to help you complete your homework

    #
   ###
  #####
 #######
#########
 #######
  #####
   ###
    #

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Author Comment

by:jschmuff
ID: 20416963
This isn't actually my homework assignment, but it is similar. Thanks though I will go over what you said and try and fix what I have.
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Author Closing Comment

by:jschmuff
ID: 31413038
Thanks for the help again you could have just in plain text said what was wrong with my code cause it was all messed up it was printing out a diamond but not correctly and wrong size. Instead of me figuring out what you were saying. I have bad reading comprehension.
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