Increasing Number

Problem Statement: 
      For given range of digits , print  the numbers such that they are in the increasing sequence from left to right.
   For e.g.
  3 digit numbers : 123 , 124, ....234, 235 , 236 , ..., 345, 346 .. ......, 687,789
  4 digit numbers : 1234, 1235 , 1236 .....2345, 2346, ....3456,3457, 3458 .......,5678,5679,5789, 6789.

Solution:

Refer to the working Source Code

Code for printing the increasing numbers within the given range of digits

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/** * Print numbers with increasing digits * @author Prateek * */ public class IncreasingNumber { private static int count=0; public static void main(String[] args) { IncreasingNumber obj=new IncreasingNumber(); System.out.println("The numbers are :"); obj.arrangeNum(3,5); // inclusive System.out.println("Total Numbers are : "); System.out.println(count); } //print increasing numbers within range of digits private void arrangeNum(int startRange , int endRange){ if(startRange == endRange +1 ) return ; arrangeNumUtil(startRange , 0); arrangeNum(startRange + 1 , endRange) ; } // Prints numbers with a given Number of digits private void arrangeNumUtil(int numDigits , int currentNum ){ int digit = (currentNum % 10) + 1; //next digit from current Number currentNum *= 10; // move number to left for (; digit <= 9; digit++) { if (numDigits == 1){ count++; System.out.println(currentNum + digit); return; } arrangeNumUtil(numDigits - 1, currentNum + digit); } } }