WordsCounter

#include <cstring>
#include <iostream>

using namespace std;

#define MAX_WORDS_UNIQUE 255
#define WORD_MAX 80

#define isUpper(ch) ((ch) >= 'A' && (ch) <= 'Z')
#define isLower(ch) ((ch) >= 'a' && (ch) <= 'z')

bool isAlpha(char ch)
{
    return isUpper(ch) || isLower(ch) || ch == '\'';
}

char toUpper(char ch)
{
    return isLower(ch) ? ch - 'a' + 'A' : ch;
}

char toLower(char ch)
{
    return isUpper(ch) ? ch - 'A' + 'a' : ch;
}

void get_word(char* buffer, int size)
{
    int ptr = 0;
    char ch;
    while (cin.get(ch)) {
        if (isAlpha(ch)) {
            buffer[ptr++] = toLower(ch);
        } else if (ptr > 0) {
            buffer[ptr++] = '\0';
            return;
        }
    }
}

int main()
{
    freopen("in.txt", "r", stdin);

    char words[MAX_WORDS_UNIQUE][WORD_MAX] = { 0 };
    int cnt[MAX_WORDS_UNIQUE] = { 0 };
    char buffer[WORD_MAX] = { 0 };

    while (cin) {

        get_word(buffer, WORD_MAX);

        int idx = 0;
        while (words[idx][0] != '\0' && idx < MAX_WORDS_UNIQUE) {
            if (strcmp(buffer, words[idx]) == 0) {
                cnt[idx]++;
                break;
            } else {
                idx++;
            }
        }

        if (idx < MAX_WORDS_UNIQUE && words[idx][0] == '\0') {
            strcpy(words[idx], buffer);
            cnt[idx]++;
        }

        buffer[0] = '\0';
    }

    for (int i = 0; i < MAX_WORDS_UNIQUE; i++) {
        if (words[i][0]) {
            cout << words[i] << "\t" << cnt[i] << endl;
        }
    }
}