06. Vowels Sum

#include <iostream>
#include <string>

using namespace std;

int main() {
    string str;
    getline(cin,str);

    int sum = 0;

    for (int i = 0; i < str.length(); i++) {
        if (str[i] == 'a') {
            sum += 1;
        }
        else if (str[i] == 'e') {
            sum += 2;
        }
        else if (str[i] == 'i') {
            sum += 3;
        }
        else if (str[i] == 'o') {
            sum += 4;
        }
        else if (str[i] == 'u') {
            sum += 5;
        }
    }

    cout << sum << endl;

    return 0;
}

Решение с тернарен оператор:

#include <iostream>
#include <string>

using namespace std;

int main() {
    string str;
    getline(cin,str);

    int sum = 0;

    for (int i = 0; i < str.length(); i++) {

        sum +=
            str[i] == 'a' ? 1 :
            str[i] == 'e' ? 2 :
            str[i] == 'i' ? 3 :
            str[i] == 'o' ? 4 :
            str[i] == 'u' ? 5 : 0;
    }

    cout << sum << endl;

    return 0;
}