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Thread: Not prompting string user input.

  1. #1
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    Default Date question

    So I am using the scanner utility for user inputs. There are 3 parts. Integer arithmetic, Real arithmetic and String operations. I am getting desired results with first 2 but I am stuck at the last one.

    Issue-
    String c1 = keyboard.nextLine(); is not prompting for user input. If I use .next instead of .nextLine it prompts but the rest of the string operations are coming out wrong as in the length will only display the length of first word and the not the whole sentence.

    Any help will be appreciated.


    import java.util.Scanner;
     
     
    public class Lab2 {
     
        /**
         * @author
         */
        public static void main(String[] args) {
            int a1,a2,a3;
            System.out.println("*** Test integer arithmetic ***\n");
            Scanner keyboard = new Scanner(System.in);
     
            System.out.print("Enter first integer number: ");
            a1 = keyboard.nextInt();
            System.out.print("Enter second integer number: ");
            a2 = keyboard.nextInt();
            a3 = a1 + a2;
            System.out.print(a1 + " + " );
            System.out.print(a2 + " = " );
            System.out.println(a3);
            a3 = a1 - a2;
            System.out.print(a1 + " - " );
            System.out.print(a2 + " = " );
            System.out.println(a3);
            a3 = a1 * a2;
            System.out.print(a1 + " * " );
            System.out.print(a2 + " = " );
            System.out.println(a3);
            a3 = a1 / a2;
            System.out.print(a1 + " / " );
            System.out.print(a2 + " = " );
            System.out.println(a3);
            a3 = a1 % a2;
            System.out.print(a1 + " % " );
            System.out.print(a2 + " = " );
            System.out.println(a3);
     
            double b1,b2,b3;
            System.out.println("*** Test real arithmetic ***\n");
     
            System.out.print("Enter first integer number: ");
            b1 = keyboard.nextDouble();
            System.out.print("Enter second integer number: ");
            b2 = keyboard.nextDouble();
            b3 = b1 + b2;
            System.out.print(b1 + " + " );
            System.out.print(b2 + " = " );
            System.out.println(b3);
            b3 = b1 - b2;
            System.out.print(b1 + " - " );
            System.out.print(b2 + " = " );
            System.out.println(b3);
            b3 = b1 * b2;
            System.out.print(b1 + " * " );
            System.out.print(b2 + " = " );
            System.out.println(b3);
            b3 = b1 / b2;
            System.out.print(b1 + " / " );
            System.out.print(b2 + " = " );
            System.out.println(b3);
            b3 = b1 % b2;
            System.out.print(b1 + " % " );
            System.out.print(b2 + " = " );
            System.out.println(b3);
     
     
            System.out.println("*** Test String operations ***\n");
            System.out.print("Enter a string of characters: ");
            String c1 = keyboard.nextLine();
            int len = c1.length();
            System.out.println("The length of string \"" + c1 + "\" is " + len);
            System.out.print("Enter an integer between 0 and 20: ");
            int cha = keyboard.nextInt();
            char ch = c1.charAt(cha);
            System.out.println("The character at index \"" + cha + "\" of string \"" + c1 + "\" is " + ch);
            System.out.print("Enter another string of characters: ");
            String c2 = keyboard.next();
            int indx = c1.indexOf(c2);
            System.out.println("The first occurrence of string \"" + c2 + "\" in string \"" + c1 + "\" is at position " + indx );
     
            }
     
    }
    Last edited by Abhi01; April 8th, 2012 at 07:12 PM.


  2. #2
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    Default Re: Not prompting string user input.

    Nvm. I figured out.

    I just had to add

     keyboard.nextLine();

    before

    String c1 = keyboard.nextLine();

  3. #3
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    Default Date Question

    I have another question.

    I am looking for this output -

    Enter your birthday (mm/dd/yyyy): 10/25/1983
    You were born on 25-10-1983

    The user is supposed to input the date in bold.

    String mm, dd, yyyy;
    		System.out.print("Enter your birthday (mm/dd/yyyy): "); 
    		mm = keyboard.next();
    		dd = keyboard.next();
    		yyyy = keyboard.next();
            System.out.println("You were born on " + dd +  mm +  yyyy);

    This the code added to the end of the previous code I posed. With the current code, I am typing in the numbers using the keyboard mm [enter] dd [enter] yyyy [enter].

    This is the output I get : -

    Enter your birthday (mm/dd/yyyy): 01/
    10/
    2001
    You were born on 01/10/2001


    Now I just want to get the 12/10/1989 all in 1 line.

  4. #4
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    Default Re: Not prompting string user input.

    I would read it all in one line and then either use String.split to get each section or define explicit positions:

    String bday = keyboard.nextLine();
    String[] strs = bday.split("/");
    System.out.println("You were born on " + strs[1] + "-" + strs[0] + "-" + strs[2]");

    or

    String bday = keyboard.nextLine();
    String d = bday.substring(0,3);
    String m = bday.substring(4,6);
    String y = bday.substring(7,9);
    System.out.println("You were born on " + d + "-" + m + "-" + y");

    You should prefer the first method as it's more reliable.

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