macOS setw c++ help

[chris200x9]

hi I am trying to make a program to create a triangle of #'s but I can't get setw to work

here is my code:

          #include <iostream>
#include <iomanip>
using namespace std;
int main () {
    int row = 0;
	int numSymbols = 1;
	int counter;
	int length;
	int numspace;
	numspaces = length;
	cin >> length;
	while( row < length )
	{
		// output spaces
		cout << setw( numspace );

		// output pound signs
		counter = 0;
		while( counter < numSymbols ) 
		{
			cout << "#";
			counter++;
		} // end while        
		cout << endl;

		// decrease number of spaces
		numSpaces--;

		// increase number of symbols to display
		numSymbols = numSymbols + 1;

		// go to next row
		row++;
		}


    return 0;
}

 

[toddburch]

What's wrong with this picture?

int length;
int numspace;
numspaces = length;
cin >> length;

Todd

 

[chris200x9]

What's wrong with this picture?

int length;
int numspace;
numspaces = length;
cin >> length;

Todd

I don't know?

 

[toddburch]

Have you tried compiling this yet?

 

[chris200x9]

yes it runs it prints #'s like so

#
##
###

I need

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

arg it wont format right on the forum but its supposed to be a triangle

 

[toddburch]

Two questions.

1) What controls the field width?

2) How can you inspect that value of what controls the field width at run time?

 

[chris200x9]

1. numspace witch is tied into length controls field width

and 2. I dont get your qestion

 

[toddburch]

Correct. numspace (or numspaces or numSpaces - whatever you settled on), controls the field width.

To see what the value of numspace is each loop, what can you add to the program?

 

[chris200x9]

ok i feel really dumb but I don't know I thought of adding numspace into the loop but that didnt work hmmmmm..... sorry

by the way thanx for being so cool

 

[toddburch]

The first time through the loop, what do you want numspace to be equal to?

 

[chris200x9]

length but I tried putting numspace = length in the loop and i got the same output

 

[toddburch]

ok, good. Does it equal length before the loop? Do a "cout" to it and see.

 

[chris200x9]

no, I cout and it doesn't show anything

 

[toddburch]

post your code.

 

[chris200x9]

#include <iostream>
#include <iomanip>
using namespace std;
int main () {
    int row = 0;
	int numSymbols = 1;
	int counter;
	int length;
	int numspace;
	numspace = length;
	cout << numspace;
	 cin >> length;
	while( row < length )
	{
		// output spaces
		cout << setw( numspace );

		// output pound signs
		counter = 0;
		while( counter < numSymbols ) 
		{
			cout << "#";
			counter++;
		} // end while        
		cout << endl;

		// decrease number of spaces
		numspace = numspace - 2;

		// increase number of symbols to display
		numSymbols = numSymbols + 2;

		// go to next row
		row++;
		} 


    return 0;
}

 

[chris200x9]

but i gtg to bed I'm just turning in this code but thank you so much for everything you are awesome!

 

[toddburch]

OH MAN!!! YOU ARE SOOOOO CLOSE to having it worked out.

Change your cout to this:

cout << "numspace = >" << numspace << "<" << endl ;

And ask yourself, is it what I expect it to be? (which is the same value as length)

Todd

 

[toddburch]

but i gtg to bed I'm just turning in this code but thank you so much for everything you are awesome!

Chris, Did you ever figure out what you needed to do to fix it? Did you slap yourself upside the head and say "Oh, MAN! I was SO close!"?

 

[toddburch]

I talked with Chris, and he didn't figure it out and turned in his assignment as was. In a private msg, I told him I would post the code here for him to see the solution.

#include <iostream>
#include <iomanip>
using namespace std;
int main () {
    int row = 0;
    int numSymbols = 1;
    int counter;
    int length;
    int numspaces;
//  numspaces = length;
    cin >> length;
    numspaces = length; //[color=red]This line was out of order!![/color] 

    cout << "numspaces = " << numspaces << endl ; 
    while( row < length )
	{
		// output spaces
		cout << setw( numspaces );

		// output pound signs
		counter = 0;
		while( counter < numSymbols ) 
		{
			cout << "#";
			counter++;
		} // end while        
		cout << endl;

		// decrease number of spaces
		numspaces--;

		// increase number of symbols to display
		numSymbols = numSymbols + 1;

		// go to next row
		row++;
		}
    return 0;
}