charStats.c

//
//  charStats.c
//  Zkouska
//
//  Created by Milan Vít on 31. 10. 10.
//  Copyright (c) 2010 Ostravská univerzita v Ostravě. All rights reserved.
//

#include <stdio.h>
#include "charStats.h"

int numberOfLowerCase = 0;
int numberOfUpperCase = 0;
int numberOfOtherChars = -1;	// user input will end up with zero
								// but we don't want to count that towards the results

char readCharacter () {
	printf ("Enter a char: ");
	
	return (getchar ());
}

void addToStats (char character) {
	if (character >= 'a' && character <= 'z') {
		numberOfLowerCase++;
	} else if (character >= 'A' && character <= 'Z') {
		numberOfUpperCase++;
	} else {
		numberOfOtherChars++;
	}
}

void printStats () {
	printf ("Number of lower-case letters: %d.\n", numberOfLowerCase);
	printf ("Number of upper-case letters: %d.\n", numberOfUpperCase);
	printf ("Number of other letters: %d.\n", numberOfOtherChars);
}

charStats.h

//
//  charStats.h
//  Zkouska
//
//  Created by Milan Vít on 31. 10. 10.
//  Copyright (c) 2010 Ostravská univerzita v Ostravě. All rights reserved.
//

#ifndef CHARSTATS_H
#define CHARSTATS_H

char readCharacter ();
void addToStats (char);
void printStats ();

#endif

main.c

//
//  main.c
//  Zkouska
//
//  Created by Milan Vít on 31. 10. 10.
//  Copyright (c) 2010 Ostravská univerzita v Ostravě. All rights reserved.
//

#include <stdio.h>
#include "charStats.h"

int main (int argc, const char *argv[]) {
	char character;
	
	do {
		character = readCharacter ();
		addToStats (character);		
	} while (character != '0');
	
	printStats ();
	
	return (0);
}