Java For Loop not outputting How (I think) it should

Question

I have no clue how I would research this otherwise, so here this is. I'm trying to create a program that will "flip bits", e.g. the string "00110011" would return "11001100". I tried to make a for loop to output the individual characters so see if getting the characters would work in this way, but it stops without outputting the characters.

public static void main(String[] args) {
    String bitsList = "01010101";
    char[] sepBits = bitsList.toCharArray();
    System.out.println("Array'd");
    int num = bitsList.length();
    System.out.println("Got length");
    for (int count = 0; count == num;) {
                System.out.println(sepBits[count]);
                System.out.println("Outputted " + sepBits[count]);  
    }
}

What do you think condition in for loop decides about?

Pshemo
– Pshemo

2015-08-14 21:24:36 +00:00
Commented Aug 14, 2015 at 21:24 — Pshemo
– Pshemo, Commented Aug 14, 2015 at 21:24

Jean Logeart · Accepted Answer · 2015-08-14 21:25:05Z

3

You never go in your for loop because count is 0 and num is 8 (length of "01010101"). Therefore count == num evaluates to false and the for loop is not entered.

Try to replace your for loop with:

for (int count = 0 ; count < num ; count++) {
    // ...
}

answered Aug 14, 2015 at 21:25

Jean Logeart

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1 Comment

Jean Logeart Over a year ago

No worries. I hope it helped :)

Parttimereaper · Accepted Answer · 2015-08-14 21:24:34Z

0

The variable count is not equal to the variable num so the for loop never triggers. I think you are looking for <= not ==. Also you never change the count so the loop will just keep printing the same spot over and over even if you do change this.

answered Aug 14, 2015 at 21:24

Parttimereaper

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Comments

Anand Bhosale · Accepted Answer · 2015-08-14 22:12:16Z

0

this might work for you

public static void main(String []args){
    String bitsList = "01010101";
    char[] sepBits = bitsList.toCharArray();
    int num = bitsList.length();

    for ( int i = num - 1 ; i >= 0 ; i-- ) {
        System.out.println("Outputted " + sepBits[i]);
    }    
}

edited Aug 14, 2015 at 22:12

answered Aug 14, 2015 at 21:48

Anand Bhosale

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1 Comment

lhoworko Over a year ago

This just reverses the string. His example is a bit ambiguous, but I think he is asking how to flip the bits, i.e. 0->1, 1->0.

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