Thread: Help making Triangle

Hi again all,

I am having some troubles making this program. Here is the assignment:

Code:

Write a computer program that prints a triangle of digits. Your program must read two positive integers as follows: 
the width of the triangle, and
the position of the triangle relative to the left margin (the amount to indent the triangle, in other words).
You can assume that the user will always enter non-zero positive integers. 

The triangle is drawn upside-down using single digit integers. For example, a width 3 indent 3 triangle looks like this: 
   123 
   12 
   1 

... and a width 13 triangle indent 0 triangle looks like this: 
1234567890123 
123456789012 
12345678901 
1234567890 
123456789 
12345678 
1234567 
123456 
12345 
1234 
123 
12 
1

and here is my code:

Code:

#include <iostream>
using namespace std;

int main ()
{
	int width = 0;
	int indent = 0;
	int digit = 1;

	cout<<"Enter the width of the triangle: ";
	cin>>width;
	cout<<"Enter the position relative to the left margin (the indent): ";
	cin>>indent;

	for (int x = 0; x < width; x++)
	{
		for (int i = 0; i < indent; i++)
		{
			cout<<" ";
		}
		for (int w = 0; w < width; w++)
		{
			cout<<digit%10;
			digit++;
		}
		width--;
		digit = 1;
		cout<<endl;
	}
	return 0;
}

When the program is run it looks like this:

Code:

Enter the width of the triangle: 5
Enter the position relative to the left margin (the indent): 3
   12345
   1234
   123

I understand why it quits short but am unable to figure out a fix for the problem.

Anyone got some suggestions? Thank you!

Make your outer loop count backwards.

> int main = 0;
And width is undeclared - are you sure this is REALLY your code?

> Sorry somehow my brain told me to write main instead of width which I wanted.
How about just copy/paste from your actual source code?

It saves you time, and we don't waste more time pointing out trivial mistakes only for you to say "oh, that's not in the real code".

> Why would I want to count backwards?
Because the lines get shorter (perhaps)