#include <iostream>
#include <fstream>
#include <cctype>
#define LETTERE_ALFABETO 26
using namespace std;
int main () {
char c;
int nLettere[LETTERE_ALFABETO];
ifstream is;
is.open("prova.txt");
for (c=0;c < 26;c++)
*(nLettere+c) = 0;
while (!is.eof())
{
c = is.get();
switch(tolower(c)) {
case 'a': (*(nLettere+0))++; break;
case 'b': (*(nLettere+1))++; break;
case 'c': (*(nLettere+2))++; break;
case 'd': (*(nLettere+3))++; break;
case 'e': (*(nLettere+4))++; break;
case 'f': (*(nLettere+5))++; break;
case 'g': (*(nLettere+6))++; break;
case 'h': (*(nLettere+7))++; break;
case 'i': (*(nLettere+8))++; break;
case 'j': (*(nLettere+9))++; break;
case 'k': (*(nLettere+10))++; break;
case 'l': (*(nLettere+11))++; break;
case 'm': (*(nLettere+12))++; break;
case 'n': (*(nLettere+13))++; break;
case 'o': (*(nLettere+14))++; break;
case 'p': (*(nLettere+15))++; break;
case 'q': (*(nLettere+16))++; break;
case 'r': (*(nLettere+17))++; break;
case 's': (*(nLettere+18))++; break;
case 't': (*(nLettere+19))++; break;
case 'u': (*(nLettere+20))++; break;
case 'v': (*(nLettere+21))++; break;
case 'w': (*(nLettere+22))++; break;
case 'x': (*(nLettere+23))++; break;
case 'y': (*(nLettere+24))++; break;
case 'z': (*(nLettere+25))++; break;
}
}
cout << "A: " << *(nLettere+0) << endl
<< "B: " << *(nLettere+1) << endl
<< "C: " << *(nLettere+2) << endl
<< "D: " << *(nLettere+3) << endl
<< "E: " << *(nLettere+4) << endl
<< "F: " << *(nLettere+5) << endl
<< "G: " << *(nLettere+6) << endl
<< "H: " << *(nLettere+7) << endl
<< "I: " << *(nLettere+8) << endl
<< "J: " << *(nLettere+9) << endl
<< "K: " << *(nLettere+10) << endl
<< "L: " << *(nLettere+11) << endl
<< "M: " << *(nLettere+12) << endl
<< "N: " << *(nLettere+13) << endl
<< "O: " << *(nLettere+14) << endl
<< "P: " << *(nLettere+15) << endl
<< "Q: " << *(nLettere+16) << endl
<< "R: " << *(nLettere+17) << endl
<< "S: " << *(nLettere+18) << endl
<< "T: " << *(nLettere+19) << endl
<< "U: " << *(nLettere+20) << endl
<< "V: " << *(nLettere+21) << endl
<< "W: " << *(nLettere+22) << endl
<< "X: " << *(nLettere+23) << endl
<< "Y: " << *(nLettere+24) << endl
<< "Z: " << *(nLettere+25) << endl
<< endl;
is.close();
system("pause");
return 0;
}