How can i print a triangle with “*”s using for loop in java?

Question

I want to draw a triangle with stars like below using for loop, but i really don\'t have any idea of how to do this ? Triangle is going to be like this:

*
**
**         


        

Answer 1

You will need two for-loops; one to print the line, and one to print the characters in a line. The number of the current line can be used to print a certain number of stars.

Use System.out.print("*") to print without adding a new line, at the end of the second loop do a System.out.println()

I'll leave the implementation of the loops as an exercise, here is the syntax: http://docs.oracle.com/javase/tutorial/java/nutsandbolts/for.html

Answer 2

          import java.util.*;

          class StarForloop
{
          public static void main(String arg[])
    {
          Scanner ob=new Scanner(System.in); //getting input
          System.out.println("Enter any NO");

          int count=ob.nextInt(); 
        String ab="*";  // initialize string variable

          for(int i=1; i<=count; i++)
        {

           ab=ab+"*"; // here you add one another string
            System.out.println(ab);


        }           
    }
}

Answer 3

you just need two loops for your required goal the third loop is useless the first outer loop is for rows and the inner loop is for printing "*".The outerloop is used here for changing the rows and maintaining the number of required rows.

public static void tri()
{ 
     for(int i=0;i<8;i++)
       {
          for(int j=0;j<=i;j++)
             {
                System.out.print("*");
                }
                   System.out.println();
                     }
}