Java Program to Increment All Element of an Array by One

Last Updated : 11 Nov, 2020

Given the array, the task is to increment each element of the array by 1. Complete traversal is required for incrementing all the elements of an array. An optimized way to complete a given task is having time complexity as O(N).

Examples:

Input : arr1[] = {50, 25, 32, 12, 6, 10, 100, 150}
Output: arr1[] = {51, 25, 33, 13, 7, 11, 101, 151}

Input : arr2[] = {3, 6, 8, 12, 45}
Output: arr2[] = {4, 7, 9, 13, 46}

1. with pre-defined values:

First, Initializing the array arr[] with pre-defined values, and after that, the length of the array should be calculated. Then use a loop, to perform the operation that is to increment the values one by one with the help of for loop. After that, the resultant of the above operation will get stored into the array and then the output will be shown with the help of for loop one by one.

Java

// Java Program to Increment All
// Element of an Array by One
public class Increment {
    public static void main(String[] args)
    {
        // assigning values in array
        int[] arr = { 50, 25, 32, 12, 6, 10, 100, 150 };
      
        // finding the length of the array
        // and assigning it to the variable n
        int n = arr.length;

        System.out.println(
            "******* BEFORE INCREMENT *******");
      
        // printing the elements of array
        // before performing operation
        for (int i = 0; i < n; i++) {
            System.out.print(arr[i]);
            System.out.print(" ");
        }

        // incrementing the values of array
        // by 1 with the help of loop
        for (int i = 0; i < n; i++) {
            arr[i] = arr[i] + 1;
        }

        System.out.println(" ");
      
        // elements of the array after increment
        System.out.println(
            "******* AFTER INCREMENT *******");
      
        // printing the elements of array after operation
        for (int i = 0; i < n; i++) {
            System.out.print(arr[i]);
            System.out.print(" ");
        }
    }
}

Output

******* BEFORE INCREMENT *******
50 25 32 12 6 10 100 150  
******* AFTER INCREMENT *******
51 26 33 13 7 11 101 151

Time Complexity: O(N), Where N is the size of an array

2. with user-defined values:

Initializing the array arr[] with user-defined values i.e. the values of the array will be given by the user, and after that, the length of the array should be calculated. Then use a loop, to perform the operation that is to increment the values one by one with the help of for loop. After that, the resultant of the above operation will get stored into the array and then the output will be shown with the help of for loop one by one.

Java

// Java Program to Increment All
// Element of an Array by One
import java.util.Scanner;

public class Increment2 {

    public static void main(String[] args)
    {
        System.out.println(
            "Enter the length of the array: ");
      
        // The object of scanner class is created
        // in order to take the input from user
        Scanner sc = new Scanner(System.in);
      
        int n = sc.nextInt();
      
        // Initializing the array of size that
        // is given by the user
        int[] arr = new int[n];
      
        // Calculating the length of the array
        int l = arr.length;

        System.out.println(
            "Enter the values you want to insert in array: ");
      
        // Taking the values from user
        for (int i = 0; i < l; i++) {
            arr[i] = sc.nextInt();
        }

        System.out.println(
            "******* BEFORE INCREMENT *******");
      
        // The elements of array before increment
        for (int i = 0; i < l; i++) {
            System.out.print(arr[i]);
            System.out.print(" ");
        }

        // Incrementing the values of the array by 1
        for (int i = 0; i < l; i++) {
            arr[i] = arr[i] + 1;
        }

        System.out.println(" ");
        System.out.println(
            "******* AFTER INCREMENT *******");
        // Elements of array after increment
        for (int i = 0; i < l; i++) {
            System.out.print(arr[i]);
            System.out.print(" ");
        }
    }
}