Loops query...

[Westyfield2]

I've hit a brick wall . I've got a char array, called word, which funnily enough contains a word and I'm playing around doing different things with it.

One thing I've done is this:

        for (int row = 0; row < word.length; row++)
            {
            for (int count = 0; count <= row; count++)
                {
                System.out.print(word[count]);
                }
            System.out.println();
            }

So if for example the word in the array was Hello it'll output:

H
He
Hel
Hell
Hello

Another thing I've done is print it out a character at a time but starting from the end:

        for (int i = word.length - 1; i >= 0; i--)
            {
            System.out.println(word[i]);
            }

Using the same example of Hello that outputs:

o
l
l
e
H

What I'd like to do next is a combination of the two. I'd like it to output the last character, then the last two characters, etc. Maybe I'm just tired and lacking in coffee, but I just can't figure it out!
Using the same example the output should be:

o
ol
oll
olle
olleH

Can anyone show me the light? I've been fiddling around for a while now and can't get it to work . I've stuck them both into a java file here if anyone wants to play around, but TBH it's the logic of how to do it I'm lacking!

Cheers

 

[Dj_Jestar]

Do what you did the first time, but reverse the string at the start

Haven't got Java to hand, but something like this is what you are probably after:

            for (int row = word.length; row >= 0; row--)
            {
                for (int count = row; count >= 0; count--)
                {
                    System.out.print(word[count]);
                }
                System.out.println();
            }

 

[Westyfield2]

Thanks

Oh right yeah I get you, thanks .

What I want to do next is

o
lo
llo
ello
hello

 

[JimAroo]

Pfft, your just never satisfied are you?

 

[Westyfield2]

Pfft, your just never satisfied are you?

I'm just messing around with different combinations! I keep forgetting that the array starts at position zero and arseing it up though!

 

[JimAroo]

Well, here's my solution in Python.

#!/usr/bin/env python

str = "Hello"

derp = len(str)

for x in str:
    derp = derp - 1
    print str[derp:len(str)]

>>>
o
lo
llo
ello
Hello

 

[Westyfield2]

Well, here's my solution in Python.

Me and Python have never got on . Might give Python another bash sometime though.


I've had a play around and managed to do moreless everything apart from the one I actually posted . Genius eh?!

        // print it with increasing number of letters per line
        for (int row = 0; row < word.length; row++) {
            for (int count = 0; count <= row; count++) {
                System.out.print(word[count]);
            }
            System.out.println();
        }

        
        System.out.println();

        
        for (int row = word.length - 1; row >= 0; row--) {
            for (int count = 0; count <= row; count++) {
                System.out.print(word[count]);
            }
            System.out.println();
        }

        
        System.out.println();

        
        for (int row = 0; row < word.length; row++) {
            for (int count = row; count >= 0; count--) {
                System.out.print(word[count]);
            }
            System.out.println();
        }


        System.out.println();


        for (int row = word.length - 1; row >= 0; row--) {
            for (int count = row; count >= 0; count--) {
                System.out.print(word[count]);
            }
            System.out.println();
        }


        System.out.println();


        // print it backwards one at a time
        for (int i = word.length - 1; i >= 0; i--) {
            System.out.println(word[i]);
        }

h
he
hel
hell
hello

hello
hell
hel
he
h

h
eh
leh
lleh
olleh

olleh
lleh
leh
eh
h

o
l
l
e
h

 

[orderoftheflame]

Not got an IDE installed to actually think this through... but:

        String output = "";

        for (int i = word.length; i > 0; i--) {
            output = word[i - 1] + output;
            System.out.println(output);
        }

Seem right?

Edit: Derp! Got >/< mixed up. Fixed now!

 

[orderoftheflame]

Realised I've got VS installed. My previous in C# :

            Char[] word = { 'H', 'e', 'l', 'l', 'o', };

            String output = "";

            for (int i = word.Length; i > 0; i--) {
                output = word[i - 1] +  output;
	        Console.WriteLine(output);
            }
            System.Console.ReadKey();

=

o
lo
llo
ello
Hello

Edit: Just realised how late to the party I am. Changed them round to have the solution you've been missing.

 

[Westyfield2]

Edit: Just realised how late to the party I am. Changed them round to have the solution you've been missing.

That's great stuff, ta .


TBH I'm surprised we didn't do any playing around like this in our Introduction to Programming classes at Uni! But that's what friday evenings are for eh!?


For anyone that may find it useful I've stuck them all in a java file here .

 

[orderoftheflame]

TBH I'm surprised we didn't do any playing around like this in our Introduction to Programming classes at Uni! But that's what friday evenings are for eh!?

I graduated recently from Uni and started my first job doing java programing just a few months ago. If they taught it all in Uni you'd be there for decades. I seem to learn something new and useful every day at work at the moment.