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Each time I try to run the code, the parts where the user has to input what there first name, last name, and show them what character they choose, it just skips them all and combines them. Any idea on how to fix this?


Java
//import java scanner
import java.util.Scanner;

//define variables
class Main 
{
  //defines variables
  String star1 = "twinkle, twinkle, little star";
  String star2, star3, firstName, lastName, password, sentenceInput, word, word2, pigWord;
  int lastNum1, lastNum2, sentTotal, sentNum;
  char character, firstLetter;
  Scanner scan = new Scanner(System.in);

  //this will run all the main methods
  public void runProgram()
  {
    twinkle();
    sentence();
    name();
    pigLatin();
  }
  
  //creating method twinkle
  public void twinkle()
  {
    System.out.println("Here is the original phrase: \n" + star1);
    star2 = star1.replace('t','c');
    star3 = star2.replace('w','r');
    System.out.println("\nThis is the phrase after replacing the T's with C's and the W's with R's: \n" + star3);
  }
  
  //creating method sentence
  public void sentence()
  {
    System.out.println("\nPlease enter a sentence:");
    sentenceInput = scan.nextLine();
    sentTotal = sentenceInput.length();

    System.out.println("The amount of characters in your sentence is: " + sentTotal);
    System.out.println("Please enter a number below " + sentTotal + ":");
    sentNum = scan.nextInt();

    character = sentenceInput.charAt(sentNum);

    System.out.println("The character you chose was: " +  character);
  }
  
  //creating method name
  public void name()
  {
    System.out.println("Please enter your first name:");
    firstName = scan.nextLine();
    System.out.println("Please enter your last name:");
    lastName = scan.nextLine();

    firstName = firstName.toUpperCase();
    lastName = lastName.toUpperCase();

    lastNum1 = lastName.length()-3;
    lastNum2 = lastName.length();

    password = firstName.substring(0,3) + lastName.substring(lastNum1 ,lastNum2);
    System.out.print("Here is your default password: " + password);
  }

  //creating method pigLatin
  public void pigLatin()
  {
    System.out.println("Please enter a word that starts with a consonant:");
    word = scan.next();
    
    calculatePig();
    System.out.println("This is your word in pig latin: " + pigWord);
  }
  
  public void calculatePig()
  {
    firstLetter = word.charAt(0);
    word2 = word.substring(1);
    pigWord = word2 + firstLetter + "ay";
  }
    
  public static void main(String[] args) {
    Main prog = new Main();
    prog.runProgram();
  }
}  


What I have tried:

I tried that in the runProgram() part of the code, if I switch sentence(); with name(); in terms of position, it'll run properly. However, I want to figure out why it's not running with it having sentence(); go first.
Posted
Updated 26-Apr-21 21:26pm

Compiling does not mean your code is right! :laugh:
Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email contained the message you wanted to send.

So now you enter the second stage of development (in reality it's the fourth or fifth, but you'll come to the earlier stages later): Testing and Debugging.

Start by looking at what it does do, and how that differs from what you wanted. This is important, because it give you information as to why it's doing it. For example, if a program is intended to let the user enter a number and it doubles it and prints the answer, then if the input / output was like this:
Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16
Then it's fairly obvious that the problem is with the bit which doubles it - it's not adding itself to itself, or multiplying it by 2, it's multiplying it by itself and returning the square of the input.
So with that, you can look at the code and it's obvious that it's somewhere here:
C#
int Double(int value)
   {
   return value * value;
   }

Once you have an idea what might be going wrong, start using the debugger to find out why. Put a breakpoint on the first line of the method, and run your app. When it reaches the breakpoint, the debugger will stop, and hand control over to you. You can now run your code line-by-line (called "single stepping") and look at (or even change) variable contents as necessary (heck, you can even change the code and try again if you need to).
Think about what each line in the code should do before you execute it, and compare that to what it actually did when you use the "Step over" button to execute each line in turn. Did it do what you expect? If so, move on to the next line.
If not, why not? How does it differ?
Hopefully, that should help you locate which part of that code has a problem, and what the problem is.
This is a skill, and it's one which is well worth developing as it helps you in the real world as well as in development. And like all skills, it only improves by use!
   
The issue is within the sentence method:
Java
public void sentence()
  {
    System.out.println("\nPlease enter a sentence:");
    sentenceInput = scan.nextLine();
    sentTotal = sentenceInput.length();

    System.out.println("The amount of characters in your sentence is: " + sentTotal);
    System.out.println("Please enter a number below " + sentTotal + ":");
/**/    sentNum = scan.nextInt(); // ***** issue here *****

    character = sentenceInput.charAt(sentNum);

    System.out.println("The character you chose was: " +  character);
  }

After the call to scan.nextInt() the read buffer still has a newline character waiting to be read. So your next call to scan.nextLine() will read that character and immediately return, rather than waiting for input from the user. Add a call to scan.nextLine() at the end of the above method to clear the input buffer.
   
v2

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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