Question

The JAVA program should do the following:
–Ask the user for how many lines of text they wish to enter

–Declare and initialize an array of Strings to hold the user’s input

–Use a while loop to prompt for and read the Strings (lines of text) from the user
at the command line. Typically, this would be a 'for' loop since we know the number of times to execute the loop based upon the number supplied by the user, but for the purposes of this assignment use a 'while' loop to practice.

–After the Strings have been read, use a for loop to step through the array of
Strings and concatenate a number to the beginning of each line and store them back in to the array:

"This is" changes to "1 This is"

"The first day" changes to "2 The first day"

and so on…

–Finally, use a **for each** loop to output the Strings (numbered lines) to the command line

Answer 1

import java.util.Scanner;

/**
 * @author 
 *
 */
public class LineNumbers {
        /**
         * @param args
         */
        public static void main(String[] args) {
                Scanner sc = new Scanner(System.in);
                System.out.println("Enter number of lines: ");
                int n=sc.nextInt();
                sc.nextLine();
                String arr[]=new String[n];
                int index=0;
                System.out.print("Enter lines: ");
                while(index<n) {
                        arr[index]=sc.nextLine();
                        index++;
                }
                for(index=0;index<n;index++) {
                        arr[index]=(index+1)+": "+arr[index];
                }
                for(String s:arr)
                        System.out.println(s);
        }
}

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