Java Program to Increment by 1 to all the Digits of a given Integer

Last Updated : 24 Nov, 2020

Given an integer, the task is to generate a Java Program to Increment by 1 All the Digits of a given Integer.

Examples:

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Input: 12345
Output: 23456

Input: 110102
Output: 221213

Approach 1:

In this approach, we will create a number which will be of the same length as the input and will contain only 1 in it. Then we will add them.

Take the integer input.
Find its length and then generate the number containing only 1 as digit of the length.
Add both numbers.
Print the result.

Java

// Java Program to Increment by 1 All the Digits of a given
// Integer
  
// Importing Libraries
import java.util.*;
import java.io.*;
  
class GFG {
    // Main function
    public static void main(String[] args)
    {
        // Declaring the number
        int number = 110102;
  
        // Converting the number to String
        String string_num = Integer.toString(number);
  
        // Finding the length of the number
        int len = string_num.length();
  
        // Declaring the empty string
        String add = "";
  
        // Generating the addition string
        for (int i = 0; i < len; i++) {
            add = add.concat("1");
        }
  
        // COnverting it to Integer
        int str_num = Integer.parseInt(add);
  
        // Adding them and displaying the result
        System.out.println(number + str_num);
    }
}

Output

Approach 2:

In this approach, we will take an integer variable with value 1, we will multiply that variable with 10 and keep on adding the variable to the number till both of them have the same length.

Take the integer input.
Add value 1 to the input.
Multiply 1 with 10 and again add them.
Keep on repeating step 2 and 3 till both of them have the same length.
Print the result.

Java

// Java Program to Increment by 1 All the Digits of a given
// Integer
  
// Importing Libraries
import java.util.*;
import java.io.*;
  
class GFG {
    // Main function
    public static void main(String[] args)
    {
        // Declaring the number
        int number = 110102;
        // Declaring another variable with value 1
        int add = 1;
  
        for (int i = 0; i < String.valueOf(number).length();
             i++) {
            // Adding variable add  and number
            number = number + add;
  
            // Multiplying value of the add with 10
            add = add * 10;
        }
        // Printing result
        System.out.println(number);
    }
}

Output

Time Complexity: O(l) where l is the length of an integer.

Space Complexity: O(1)

My Personal Notes

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