Problems at detecting spacebars at Strings

Question

So I'm doing a program that takes a user input and when it finds chars that are similar to numbers, it replaces it by the number. (For example, it replaces O's by 0's, e's by 3's, etc) The problem is that when it finds a blank space it all messes up. You can check by compiling the code that the output is completely messed up.

/* Program to encrypt text replacing some letters by similar numbers
Done by: Gabriel Mello
*/
import java.util.Scanner;
import java.util.Random;
public class Main {
public static void main(String[] args) {
    Scanner sc=new Scanner(System.in);
    String input; //Allocating space for user input
    char[] output=new char[100000]; //Allocating space for final output
    while(true){ // Lets it work as many times as wished


     System.out.println("Escribí la frase que quieras transformar"); // Spanish for input your frase
     input=sc.next(); //Takes user input

         for(int i=0; i<=input.length()-1;i++){ //Iterates over every char in the input
                     switch(input.charAt(i)){//Checks wether the current digit is valid for replacement,
                     case 'O':                    // if it is, it replaces it, if not, it leaves it as it is.
                     case 'o': output[i]='0';
                     break;
                     case 'L':
                     case 'l': 
                     case 'I':
                     case 'i': output[i]='1';
                     break;
                     case 'Z':
                     case 'z': output[i]='2';
                     break;
                     case 'E':
                     case 'e': output[i]='3';
                     break;
                     case 'A':
                     case 'a': output[i]='4';
                     break;
                     case 'S':
                     case 's': output[i]='5';
                     break;
                     case 'G':
                     case 'g': output[i]='6';
                     break;
                     case 'T':
                     case 't': output[i]='7';
                     break;
                     case 'B':
                     case 'b': output[i]='8';
                     break;
                     case 'P':
                     case 'p': output[i]='9';
                     break;
                     default: output[i]=input.charAt(i);
                     }

         }

             System.out.println(output); //Prints the output
             for(int i=0;i<=output.length-1;i++){ //Resets the output array
                 output[i]=' ';
             }
    }


}
}

Your code prints several new lines which makes it difficult to solve the problem. Try moving the `System.out.println(output)` out of your while loop. — dumbPotato21, Jan 14 '17 at 15:58
The while loop just lets the user use the program several times without having to run it over and over again. Just ignore it — Otomeram, Jan 14 '17 at 16:00
Did you try stepping through your code with the debugger and inspect what's going on when it hits a space? — Filburt, Jan 14 '17 at 16:02
Tried to use Eclipse's debugger, don't know how it works tho, it just appears to run the code the same way — Otomeram, Jan 14 '17 at 16:03
You wouldn't even get an output(At least, not what you expect). You print your `output` array, which is declared as `char[] output=new char[100000];` This would print all the `100000` elements in the array, even though you might not have filled the entire array. This would result in empty lines printed over the screen. Did you **try running** the code ? — dumbPotato21, Jan 14 '17 at 16:05
I obviusly did. If the input were "How are you doing" the output would be "d01n9" — Otomeram, Jan 14 '17 at 16:07
Can't you just check it the `char` is a space, and if `true` skip to the next `character` ? — dumbPotato21, Jan 14 '17 at 16:09
Then there would be no blank spaces, hence the output would look like "h0w4r3y0ud01n9" — Otomeram, Jan 14 '17 at 16:10
That's what it's supposed to do. The default case triggers when the char ain't replacable and copies it as it was — Otomeram, Jan 14 '17 at 16:13
Got it, You are inputting just the first word through your keyboard. Try replacing `sc.next()` with `sc.nextLine()`. Tell Me if that fixes the problem — dumbPotato21, Jan 14 '17 at 16:18
Oh, I'll try that, even though in some previous versions it did recieve the complete input. Once I finish eating I'll tell you. — Otomeram, Jan 14 '17 at 16:20
@Otomeram Just so you know, here is a link you might refer [to](http://stackoverflow.com/questions/22458575/whats-the-difference-between-next-and-nextline-methods-from-scanner-class) — dumbPotato21, Jan 14 '17 at 16:21
I see, though I insist it read the whole line in previous versions — Otomeram, Jan 14 '17 at 16:25
@Otomeram Could you possibly give that code you keep referring to ? — dumbPotato21, Jan 14 '17 at 16:26
And one hint: move initializion to top, so before you read the input. — Martin G, Jan 14 '17 at 16:33

score 1 · Accepted Answer · edited Jan 14 '17 at 17:11

1

The Scanner input splits at spaces. So if you type in 12 34 the first input your code sees is 12. It Runs through the for(int i=0; i<=input.length()-1;i++) loop, then the while loop finds another input 34 and again runs through it. See the Java doc:

A Scanner breaks its input into tokens using a delimiter pattern, which by default matches whitespace.

Replace input=sc.next() by input=sc.nextLine() to fix it.

edited Jan 14 '17 at 17:11

dumbPotato21

5,669
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answered Jan 14 '17 at 16:31

Martin G

229
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What do you mean by `the while loop finds another input "34" and again runs throu it.` ? – dumbPotato21 Jan 14 '17 at 16:42

Problems at detecting spacebars at Strings

1 Answers1