For loop

[brendancostner]

Write a C++ program that asks the user to enter an integer N and display N lines as
follows. On line i, display i dollars ($), followed by a single pound (#)
character. For example, line 0 will have 0 dollars signs followed by a pound sign.
Line 1 will have 1 dollar sign followed by a pound sign. As an example, for N= 6, the
pattern should look as follows.
#
$#
$$#
$$$#
$$$$#
$$$$$#
$$$$$$#

I've gotten this far, but i don't know how to set it to add the $ signs. I think I need to use a nessted for loop, but I can't figure it out. Any help would be greatly appreciated.

#include <iostream>
using namespace std;
int main ()
{
int i,x;

cout<<"Enter a number: ";
cin>>x;
cout<<endl;

for(i=0;i<=x;i++){

cout<<i<<"#"<<endl;
}
return 0;
}

[DragonDePlatino]

Yes. You will want to add a nested for loop.

#include <iostream>
using namespace std;
int main ()
{
	int x;

	cout << "Enter a number: ";
	cin >> x;
	cout << endl;

	for(int i = 0;i < x; i++)
	{
		for(int j = 0; j<i; j++)
		{
			cout << "$";
		}
		cout<< "#" <<endl;
	}
	return 0;
}

First, you create an outer for loop like the one you have but have i < x. Inside that loop, create another.

On the first loop: i = 0, j = 0, j isn't less than i so the nothing happens. Print #.
Second loop: i = 1, j = 0, the loop prints $ once. Print #.
Third loop: i = 2, j = 0, the loop prints $ twice. Print #.
etc etc etc

Side note:

You should initialize i inside the for loop so that once the loop ends, the i is deleted. Otherwise, the i still exists after you're done with it. I've done that here. Also, use the [code] marks! It will make your pasted code a lot prettier.

[brendancostner]

Thank you so much, I was having so much trouble because I didn't realize you simply "cout<<"$";". And just out of curiosity, why do most people tend to use "i" and "j"? Every problem I find similar, thats what people use and i'm just curious.

[TheIdeasMan]

And just out of curiosity, why do most people tend to use "i" and "j"? Every problem I find similar, thats what people use and i'm just curious.

Hi,

I prefer not to use i and j. They look too similar, and I have seen problems that stem from this, especially when there are i and j everywhere.

I prefer to call them what they are: Row and Col, as an example. That way a logical error like Table[i][i] becomes Table[Row][Row] which is much easier to spot, even better much harder to make the error in the first place.

[TarikNeaj]

And just out of curiosity, why do most people tend to use "i" and "j"?

Maybe this will answer your question -

http://programmers.stackexchange.com/questions/86904/why-do-most-of-us-use-i-as-a-loop-counter-variable