ex5_12.cpp

#include <iostream>

using std::cin;
using std::cout;
using std::endl;

int main()
{
    unsigned aCnt = 0, eCnt = 0, iCnt = 0, oCnt = 0, uCnt = 0, spaceCnt = 0,
             tabCnt = 0, newLineCnt = 0, ffCnt = 0, flCnt = 0, fiCnt = 0;
    char ch, prech = '\0';
    while (cin >> std::noskipws >> ch) {
        switch (ch) {
        case 'a':
        case 'A':
            ++aCnt;
            break;
        case 'e':
        case 'E':
            ++eCnt;
            break;
        case 'i':
            if (prech == 'f') ++fiCnt;
        case 'I':
            ++iCnt;
            break;
        case 'o':
        case 'O':
            ++oCnt;
            break;
        case 'u':
        case 'U':
            ++uCnt;
            break;
        case ' ':
            ++spaceCnt;
            break;
        case '\t':
            ++tabCnt;
            break;
        case '\n':
            ++newLineCnt;
            break;
        case 'f':
            if (prech == 'f') ++ffCnt;
            break;
        case 'l':
            if (prech == 'f') ++flCnt;
            break;
        }
        prech = ch;
    }

    cout << "Number of vowel a(A): \t" << aCnt << '\n'
         << "Number of vowel e(E): \t" << eCnt << '\n'
         << "Number of vowel i(I): \t" << iCnt << '\n'
         << "Number of vowel o(O): \t" << oCnt << '\n'
         << "Number of vowel u(U): \t" << uCnt << '\n' << "Number of space: \t"
         << spaceCnt << '\n' << "Number of tab char: \t" << tabCnt << '\n'
         << "Number of new line: \t" << newLineCnt << '\n' << "Number of ff: \t"
         << ffCnt << '\n' << "Number of fl: \t" << flCnt << '\n'
         << "Number of fi: \t" << fiCnt << endl;

    return 0;
}