How to make an input let's say 9 and print 1-9 in a pyramid way

Question

1.00/5 (1 vote)

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qInput : 9

Output:
1
23
456
789

//Or

Input: 10

Output;
1
23
456
78910

//Or

Input:12
Output:
1
23
456
78910
1112

What I have tried:

Java

import java.util.Scanner;


public class Main {

  public static void main(String[] args) {
  
  Scanner scan = new Scanner(System.in);
  
  int input = scan.nextInt();
  
 
 
  
       for(int i = 1; i <= input; i++){
       
          System.out.print(i);
          
          
           System.out.println();
          
         
         
       
            //Problem is how to make the ouput like a pyramid like this
      // 1
      // 23
      // 456
      // 789\\
            
            
           
        
              
       }
      
 
  }
 }

Posted 5-Dec-21 20:23pm

1B_Vincent Renzo Quilon

Updated 5-Dec-21 20:51pm

CPallini

v2

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CPallini · Answer 1 · 2021-12-05T20:51:00

A simple way to obtain the result is introducing two variables, to keep track of the current count of digits in the row and the total number of allowed digits in the same row:

Java

import java.util.Scanner;

public class Main
{
  public static void main(String[] args)
  {
    Scanner scan = new Scanner(System.in);
    int input = scan.nextInt();

    int count = 0; int limit = 1;

    for(int i = 1; i <= input; i++)
    {
      System.out.print(i);
      ++count;
      if ( count == limit )
      {
        System.out.println();
        ++limit;
        count = 0;
      }
    }
    if (count != 0)
      System.out.println();
  }
}

OriginalGriff · Answer 2 · 2021-12-05T20:47:00

Think about it: what is common to all the prints?

They all start with the same number, and each successive line has one more number printed, until the target number is done.
So you need a loop, which prints all the number up to and including the target. Write that first, and test it. Make sure it prints exactly what you expect under all circumstances:

123456789

12345678910

123456789101112

When that works, add a variable outside the loop called printLineAtand a second calledprintingAt. Set both to 1.
Then inside the loop reduce printingAt by one and check it.
If it is zero, increment printLineAtand a setprintingAt to the new value. Then print a newline.

Try it, it's not as complicated as you think.

How to make an input let's say 9 and print 1-9 in a pyramid way

2 solutions

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