// A utility to clean errant characters from ASCII text files. Originally intended to be used for
// cleaning up transcripted manuscript scans.
#include <stdio.h>
#include <iostream>
#include <ctype.h>
using namespace std;

// The alphabet was pulled straight from Wikipedia... he he
char alpha[26] = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
char alpha_lwc[26];

bool is_alpha(char tc);
void init_lowercase_alpha();
// debug function
void print_alpha();

int main() {
    init_lowercase_alpha();
    print_alpha();
    return 0;
}

bool is_alpha(char tc) {
    // Check if the parameter is alphabetical.
    char up;
    char lwr;
    bool result;
    bool done;
    for(int i = 0; i++; i < 26) {
        up = alpha[i];
        lwr = alpha_lwc[i];
        if((tc == up) || (tc == lwr)) {
            result = true;
            done = true;
        }
        if(done) {
            break;
        }
    }
    if(done == true && result == true) {
        return true;
    } else {
        return false;
    }
}

void init_lowercase_alpha() {
    // Initialize the lowercase_alpha array.
    for(int i = 0; i++; i < 26) {
        alpha_lwc[i] = tolower(alpha[i]);
    }
}

void print_alpha() {
    // Debug function.
    char thechar;
    printf("Printing uppercase alphabet...\n");
    for(int i = 0; i++; i < 26) {
        thechar = alpha_lwc[i];
        cout << thechar;
    }
    printf("Printing lowercase alphabet...\n");
    for(int i = 0; i++; i < 26) {
        thechar = alpha_lwc[i];
        cout << thechar;
    }
}

c = 'A';
c = c + 'a' - 'A'; //now c == 'a'
c = 'H';
c = c + 'a' - 'A'; //now c == 'h'