06. Speed Info

#include <iostream>

using namespace std;

int main() {
    double speed;
    cin >> speed;

    string info = "";

    if (speed <= 10) {
        info = "slow";
    }
    else if (speed <= 50) {
        info = "average";
    }
    else if (speed <= 150) {
        info = "fast";
    }
    else if (speed <= 1000) {
        info = "ultra fast";
    }
    else if (speed > 1000) {
        info = "extremely fast";
    }

    cout << info << endl;

    return 0;
}

Решение с тернарен оператор:

#include <iostream>

using namespace std;

int main() {
    double speed;
    cin >> speed;

    string info =
        speed <= 10 ? "slow" :
        speed <= 50 ? "average" :
        speed <= 150 ? "fast" :
        speed <= 1000 ? "ultra fast" : "extremely fast";

    cout << info << endl;

    return 0;
}