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  1. import java.util.Scanner;
  2.  class Jtutorial1 {
  3.     public static void main(String args[]){
  4.         Scanner input = new Scanner(System.in);
  5.         int i,j;//Declared outside of the loop
  6.  
  7.  
  8.         System.out.println("Enter a number: ");
  9.         int userSel=input.nextInt();//userSel is how many numbers the following loops will count up to
  10.  
  11.         for(i=0; i < userSel; i++){//start outer loop
  12.             for(j=1; j<=i; j++){//start inner loop--Inner loop will count until j=i
  13.                 System.out.print(j);//Print out the current value of j
  14.             }//end inner loop
  15.             System.out.println();//Go to the next line after printint from 1-(current value of i on each line)
  16.         }//end outer loop
  17.  
  18.  
  19.  
  20.         for(i=userSel; i >= 0; i--){//start outer loop--count from current value of userself (which = i from last loop down to 0)
  21.             for(j=1; j<=i; j++){//start inner loop--Count from 1-current value of i
  22.                 System.out.print(j);//print current value of j--each time on the same line
  23.             }//end inner loop
  24.             System.out.println();//Newline once j=i
  25.         }//end outer loop        
  26.  
  27.         //1
  28.         //12
  29.         //123
  30.         //1234
  31.         //12345
  32.         //1234
  33.         //123
  34.         //12
  35.         //1
  36.  
  37.  
  38.     }//end main
  39. }//end class
Success #stdin #stdout 0.07s 213888KB
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stdin
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stdout
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Enter a number: 

1
12
123
1234
12345
123456
1234567
12345678
123456789
12345678
1234567
123456
12345
1234
123
12
1
https://ideone.com/LLNXq
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
public

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