# Thread: While loop triangle problem

1. Member Join Date
Mar 2009
Posts
1
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0

## While loop triangle problem

My task is to take a user input that ranges from 1-50 and use it to create a triangle of asterisks. I.E:

Enter number: 5

*
**
***
****
*****
****
***
**
*

I know that i need 2 seperate embedded while loops and that the first one creates a row of asterisks equal to the row number until you reach the input and the second subtracts 1 asterisk until you reach 0.

I can not figure out what is wrong with my code to do this...can someone help please.

Java Code:
```import java.util.Scanner;

public class triangle {

public static void main(String[] args) {
Scanner kbd = new Scanner(System.in);
String asterisk;
System.out.print("Enter a triangle size (between 1 and 50): ");
int number = kbd.nextInt();
asterisk = "*";
int length = asterisk.length();
int lines = 0;
while (lines <= number){
System.out.println(asterisk);
lines++;
while (length <= number) {
System.out.print(asterisk);
length++;
}
}
while (lines > 0 ) {
System.out.println(asterisk);
lines--;
while (length <= number) {
System.out.print(asterisk);
length++;
}
}

}
}```  Reply With Quote

2. ## what is the difference of inputs from 1 - 50?  Reply With Quote

3. ## correct me if im wrong

input: 3

*
**
***
**
*

input 2

*
**
*

input 4

*
**
***
****
***
**
*  Reply With Quote

4. ## :) try this

Java Code:
```public static void main(String[] args) {
Scanner kbd = new Scanner(System.in);
final String ASTRTISK = "*";
System.out.print("Enter a triangle size (between 1 and 50): ");
int number = kbd.nextInt();
int lines = 1;
final int lenght = (number * 2) - 1;
int loops = 1;

while (lines <= lenght) {

for (int index = loops; index > 0; index--) {
System.out.print(ASTRTISK);
}
System.out.println("");

if (lines >= number ) {
loops -= 1;
} else {
loops += 1;
}

lines += 1;
}

}```  Reply With Quote

5. ## azziel... I know you mean good, but it's not a good idea to give complete working code to the OPs'... too much temptation to cut & paste & forget. There's no learning process. It would be much better to give hints, links, pseudo code, explanations, exples and code snippets.

Thanks,
CJSL  Reply With Quote

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