Adding 1 extra char to string for each loop

Question

I have a string which starts with only 1 character "$". I have created a loop which runs 4 times, and each time, i want my string to append with 1 extra "$". So when the program runs, it should result in this:

$
$$
$$$
$$$$

Here is my attempt so far:

        string draw = "";
        int counter = 0;

        while (counter < size) // size is 4
        {
            counter++;
            draw += "$\n";
        }

So at the moment it results in:

$
$
$
$

Once i get this too work i would then also like to decrease by 1 each time after it reached the size. So if the size is 4 it should look like this:

$
$$
$$$
$$$$
$$$
$$
$

Use 2 loops. One that goes to the next and one inner loop that prints characters. So when the outer loop is at 0, the inner loop goes to 1, outer is 1, inner loop goes to 2 and so on. After 3, you keep printing one less char. — CodingYoshi
– CodingYoshi, Commented Sep 10, 2018 at 5:05

Uttam Gupta · Accepted Answer · 2018-09-10 04:49:57Z

2

You can use below code

        int size = 4;
        string draw = "";


        while (size>0) // size is 4
        {
            size--;
            draw += "$";
            Console.WriteLine(draw);
        }

        while (draw.Length > 1)
        {
            size++;
            draw = draw.Substring(0, draw.Length - 1);
            Console.WriteLine(draw);
        }

answered Sep 10, 2018 at 4:49

Uttam Gupta

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Comments

AliJP · Accepted Answer · 2018-09-10 05:00:23Z

2

Because every time you insert a new line character after $ character. I think you should use another variable to store the result. this code will be work:

int size = 4;
string draw = "";
int counter = 0;
string res = "";

while (counter < size) // size is 4
{
    counter++;
    draw += "$";
    res += draw + "\n";
}
while (counter > 0)
{
    counter--;
    draw = draw.Remove(draw.Length - 1, 1);
    res += draw + "\n";
}

It is always better to use StringBuilder instead of just concatenate a string for better performance:

int size = 4;
int counter = 0;
var sb = new StringBuilder();
while (counter < size) // size is 4
{
    counter++;
    sb.Append("$");
    Console.WriteLine(sb.ToString());
}

And for removing a character from the end of your string you can use Remove method like this:

while (counter > 0) // size is 4
{
    counter--;
    sb.Remove(sb.Length - 1, 1);
    Console.WriteLine(sb.ToString());
}

edited Sep 10, 2018 at 5:00

answered Sep 10, 2018 at 4:34

AliJP

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2 Comments

Tom Tok Over a year ago

This result in: $$$$, i am also unable to use any other references than system

AliJP Over a year ago

For each loop you display the result and add a new line char with console.writeline(). If you want to store the result in a seperate strimg, you can define a new string and instead of Console.Writeline, write res = draw + "\n";

Anup Patil · Accepted Answer · 2018-09-10 04:44:58Z

1

You Refer below code,

https://www.csharpstar.com/10-different-number-pattern-programs-in-csharp/

       Console.Write("Enter a number: ");
        int n = Convert.ToInt32(Console.ReadLine());

        Console.WriteLine();

        for(int i = 1; i < n; i++)
        {
            for(int j = 1; j <= i; j++)
                Console.Write("$");
            Console.WriteLine();
        }
        for(int i = n; i >= 0; i--)
        {
            for(int j = 1; j <= i; j++)
                Console.Write("$");
            Console.WriteLine();
        }
        Console.WriteLine();

answered Sep 10, 2018 at 4:44

Anup Patil

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Comments

Access Denied · Accepted Answer · 2018-09-10 04:47:02Z

0

Use 2 string builders:

StringBuilder stringBuilder = new StringBuilder();
StringBuilder lineBuilder = new StringBuilder();

int counter = 0;
int size = 4;
while (counter < size) // size is 4
{
   counter++;
   lineBuilder.Append("$");
   stringBuilder.Append($"{lineBuilder}\n");               
}

string[] lines = stringBuilder.ToString().Split('\n');
while (counter > 0)
{                
   stringBuilder.Append(lines[counter-1]);
   stringBuilder.Append("\n");
   counter--;
}
Console.WriteLine(stringBuilder.ToString());

edited Sep 10, 2018 at 4:47

answered Sep 10, 2018 at 4:39

Access Denied

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2 Comments

Tom Tok Over a year ago

I am unable to use stringBuilder. the only reference i am too use is system

Access Denied Over a year ago

@TomTok You can in fact use it. Because StringBuilder is in system library.

Nhan Phan · Accepted Answer · 2018-09-10 04:52:42Z

0

you can use 2 string to do that, and don't need to using StringBuilder in case you don't want to use it:

        string draw = "";
        string result = "";
        int counter = 0;
        int size = 4;

        while (counter < size)
        {
            counter++;
            draw += "$";
            result += draw + "\n";
        }

        Console.WriteLine("Increase $:");
        Console.WriteLine("");
        Console.WriteLine(result);

        while (counter > 0)
        {
            counter--;
            draw = draw.Remove(0, 1);
            result += draw + "\n";
        }

        Console.WriteLine("Decrease $: ");
        Console.WriteLine("");
        Console.WriteLine(result);

answered Sep 10, 2018 at 4:52

Nhan Phan

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Comments

Paul Roub · Accepted Answer · 2020-05-18 15:27:34Z

0

using System;

namespace starpattern

{
    class Program

    {
        static void Main(string[] args)

        {

            int i, j;

            for (i = 1; i <= 5; i++)

            {

                for (j = 1; j <= i; j++)

                {

                    Console.Write("$");

                }

                Console.WriteLine();

            }

            Console.ReadLine();

        }

    }

}

edited May 18, 2020 at 15:27

Paul Roub

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answered May 18, 2020 at 15:18

CodeDebugger

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