ASCII 30, ASCII 31, '

[acevans2]

Hello guys, I have a few quick (I should hope..) questions.

The assignment is that I'm to read in a file of an encoded message and decode it and print it.

I'm hung up on this:

I'm checking for

a) an ASCII 30 character, which I am supposed to change to a space (" ")
b) an ASCII 31 character, which I am supposed to change to a new line (\n)
c) a 4, which should become an apostrophe

the problems are here:

(this is a function)

char checkSpecial(char ch)
{
		
	if (ch=='1E')
		{
		ch = ' ';
		return ch;
		}
	else if (ch=='1F')
		{
		ch = '\n';
		return ch;
		}
	else
		return ch;
		
}

This won't work. 1E and 1F are clearly not the way to go. What is?

And for c).

case '4':
ch = '''; 

How'm I supposed to put that in there? It's clearly messing it up by having three apostrophes in a row.

Thanks a million for anyone who has something to add.

-Andrew

[firedraco]

To check a character, you can either do:

ch == ## (i.e. ch == 30)
//or
ch == 0x## (i.e. ch == 0x1E) 

To input characters like " ' inside of a string literal, put an escape slash (\) before it:

"The \"second\" word of this sentence has \"s around it."

[acevans2]

Thanks draco, but I still can't get the ASCII 30 and ASCII 31 pieces right.

They show up in the text file I was given as a triangle and an upside down triangle. Is 0x1E and 1F the proper thing to have it look for? I still have no spaces or new lines in my output.

[firedraco]

Hmm, did you try just looking for ch == 30/31?

[acevans2]

Just gave it a shot, but no-go.

This is the information I was given:

#

Two white space characters were encoded as non-standard characters:

a blank (' ') was encoded as an ASCII 30
a newline character ('\n') was encoded as an ASCII 31

And the file that I am decoding is this:

http://www.cs.niu.edu/~mcmahon/cs240/Assign/code.txt

[firedraco]

Hmmm, try \30 or \0x1E....it probably won't work but you might as well give it a try.

EDIT: You could also try:

if (ch == (char) 30)

[acevans2]

That didn't work either :(

This is insane! Did he tell me the right ASCII character number? Because if they are indeed 30 and 31, why wouldn't any of your solutions have worked...

[guestgulkan]

You are making a bit of a meal of this.
That code.txt file does contain values of hex 1E and 1F.

As others have already said you character replace function should
look more like this:

char checkSpecial(char ch)
{
    if (ch== 0x1E)
    {
        ch = ' ';
        return ch;	
    }
    else if (ch== 0x1F)
    {
        ch = '\n';
        return ch;
    }
    else
    return ch;
		
}

maybe you are also having issues reading the file correctly??