Thread: getchar putchar: a word on each line

Hey! I need some help getting my input to output 1 word on each line.
Instead of being told how, I'd like to learn because it is for school Thank you

Code:

#include <stdio.h>

int main(void)

{
    int usertext;

    while ((usertext = getchar() ) !=EOF)
        putchar (usertext);
    return 0;
}

You are getting a letter at a time and outputting it. If the user enters a word and presses return, then it will work fine.

If the user enters two words on a single line, then you'll have to add your own newline character and remove (filter out / ignore) the blanks.

Ok, so check to see what type of thing you've got from getchar, and if it's what you need to stop on, put a newline.


Quzah.

Alright this is a little better, I need to get rid of the blank spaces when commas are entered, and if multiple blank lines are entered, i need them to disapear.

Code:

#include <stdio.h>

int main(void)

{
    int usertext;
    int newline = 0;

    while ((usertext = getchar() ) !=EOF)
    {
        if (((usertext >= 'A')&&(usertext <='Z')) || ((usertext >= 'a')&&(usertext <='z')))
        {
            putchar (usertext);
            newline = 1;

        }
    else if (newline == 1)
    {
        putchar(10);
        newline = 1;
    }
    }
    return 0;
}

1. You never reset newline to zero.
2. You're using an else when you probably shouldn't for the way you're doing it.
3. You should be setting newline to zero inside the else-chunk-that-shouldn't-be-else.
4. Of course it's going to print punctuation. You're not telling it not to.

Quzah.

Look up <ctype.h>, it has a slew of functions which might interest you. If you're looking in your book's index, look for functions starting with "is".


Quzah.

Let's say we only want to show punctuation.

Code:

while( (c = getchar()) != EOF )
{
    if( ispunct( c ) )
        putchar( c );
    else
        putchar( 'X' );
}

Now, I chose to display an X for everything that wasn't punctuation. But basically it works something like that. Or if you want to be fun...

Code:

while( (c=getchar())!=EOF )
    putchar( ispunct(c)?c:'X' );

Quzah.

You only need 'newline = ...' in there if you plan on using that for something. For example:

Code:

if( ispunct( usertext ) )
    newline = 1;
if( newline == 1 )
{
    putchar( '\n' );
    newline = 0;
}
else
{
    putchar( usertext );
}

Not that the above code is necessarily the ideal way to do it, but rather, it's an illustration of how you might use that sort of flag to do something later on in your code. As it is in your above code, you aren't actually using it for anything.


Quzah.