[CS50 2018] [Lecture 2] String (C++ version)

string0.cpp

#include <iostream>
using namespace std;

int main(void) {
    string s;
    cout << "Input: ";
    cin >> s;

    cout << "Output: ";
    for (int i = 0; i < s.length(); i++)
    {
        cout << s[i] << "\n";
    }
}

string1.cpp

#include <iostream>
using namespace std;

int main(void) {
    string s;
    cout << "Input: ";
    cin >> s;

    cout << "Output: ";
    for (int i = 0, n = s.length(); i < n; i++)
    {
        cout << s[i] << "\n";
    }
}

string2.cpp

#include <iostream>
using namespace std;

int main(void) {
    // 提示輸入使用者的名字
    string s;
    cout << "Name: ";
    cin >> s;

    // 計算字元數直到 '\0' (aka NUL)
    int n = 0;
    while (s[n] != '\0') {
        n++;
    }
    cout << n << "\n";
}

string3.cpp

#include <iostream>
using namespace std;

int main(void) {
    string s;
    cout << "String: ";
    cin >> s;

    for (int i = 0; i < s.length(); i++)
    {
        int c = (int) s[i];
        cout << s[i] << " " << c << "\n";
    }
}