Thread: Question for Alternative Solution in Program

In this crazy vowel remover program I made:

Code:

#include <stdio.h>
#include <ctype.h>

char isvowel (char a);

int main () {

	char c;

	printf("Enter whatever you want to be stripped of vowels. Press # when done.\n\n");

	while ((c = getchar())!= '#'){
	c = isvowel(c);

	if (c == '\n'){
	    putchar('\n');
	}

	putchar(c);

	}

	return 0;

}

char isvowel (char a) {

	switch (a) {

	case 'A': 
	case 'a': a='\a';
			break;

	case 'E': 
	case 'e': a='\a';
			break;

	case 'I': 
	case 'i': a='\a';
			break;

	case 'O':
	case 'o': a='\a';
			break;

	case 'U': 
	case 'u': a='\a';
			break;

	case 'Y': 
	case 'y': a='\a';
			break;

	}

	return a;

}

Are there any alternate ways to make vowels a blank space?

I'm not able to use printf(""); because the function has to return a char, and a = ''; doesn't work.

I used the \a for alarm, because it never really did crap for me.

By the way, if anyone can tell me any uses for \a, I'd appreciate it..since everywhere I go it just tells me it's an alarm.

I'm working on a word counter program, which I will post in a bit when I fix it up.

I don't want to use arrays or pointers with these because not only do I not understand them very well yet, but I don't want to move to more advanced stuff without knowing the earlier stuff down pat.

Thanks.

Ah, and I've been racking my brain to put a \n inbetween the user's input and my output.

Can't think of a way to do it with the current structure because it's in a while loop.

Quzah, that is an awesome way to put a switch statement if you want to save space. I also like the way it works by working with return values. Good template to do in other programs.

Prelude, that is seems like a great way to do it as well, but I am about to learn arrays right now, so I have no idea how to use that yet lol. I will check it out though once I do.

However, I already knew how to do the ' ' for inserting a blank space...I was just wondering how would you send back no space? Ie. remove the vowel and insert nothing. Only way I was able to do it was using \a.

Also, are there actually any uses for \a? It says its an alarm, an alarm for what? It's not going to wake me up in the morning or anything.

Thanks guys.

Originally Posted by Prelude

>I was just wondering how would you send back no space?
Something like this?

Code:

#include <ctype.h>
#include <stdio.h>

int is_vowel(int c);

int
main(void)
{
  int c;

  while ((c = getchar()) != '#') {
    if (!is_vowel(c)) {
      putchar(c);
    }
  }

  return 0;
}

int
is_vowel(
  int c
  )
{
  c = toupper(c);

  return c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U';
}

>Also, are there actually any uses for \a?
It's a standard way to create an audible or visible alert. You can use it however you like. I've never had cause to use it though, other than with fun test programs.

Yep, that code does it.

So, what exactly is going on in there...if is_vowel does not return a true value, you print out c.

So in the is_vowel function, the

Code:

return c == 'A' || c == 'E' || c == 'I' || c == 'O' || c == 'U';

basically means that you return c if it equals a vowel. So it should only return true, when it's a vowel causing only consonsants to be printed.

So returns are allowed to have boolean expressions? It can function like an if statement?

The return part only functions, or returns a true value when it's a vowel, so the return part acts as an if statement?

Sorry for the confusing wording, but I'm sure you can get the gist of what I'm asking.

Originally Posted by Prelude

>basically means that you return c if it equals a vowel.
No, it returns the result of a boolean expression, 0 or 1. If any of the tests fail then is_vowel returns 0, otherwise it returns 1. That value can further be used by the calling function to do something special with vowels if is_vowel returns 1 (in this case, not writing the character).

>So returns are allowed to have boolean expressions?
Yes.

Ahhhh, now I understand.

I forgot the == was also a comparison to check if something is equal or not, and returns a value.

I am no longer confuzzled now.

I'm not quite sure what the following code posted by quzah means:

rand()%10 == 0

I understand 'rand()%10' is generating a random number between 0 and 10, easy. But the section of code that reads '== 0', I have no idea what it does or means, would somebody mind explaining it?