C++，C++/CX に挑戦！

#include <string>
#include <iostream>
using namespace std;

int main() {
    cout << "【+=, append による追加更新】\n\n";

    cout << "◆string型文字列 s0, s1, s2 "
            "を生成\n";
    cout << " string s0(\"S0*\");\n";
    cout << " string s1(\"S1*\");\n";
    cout << " string s2(\"S2*\");\n";
    string s0("S0*");
    string s1("S1*");
    string s2("S2*");
    cout << " s0 … " << s0 << '\n';
    cout << " s1 … " << s1 << '\n';
    cout << " s2 … " << s2 << "\n\n";

    cout << "◆+= による追加更新\n";
    cout << " string a(\"Aaa\");\n";
    cout << " char b[] ={ \"Bbb\" };\n";
    cout << " const char* c = \"Ccc\";\n";
    cout << " s0 += a;\n";
    cout << " s1 += b;\n";
    cout << " s2 += c;\n";
    string a("Aaa");
    char b[] = { "Bbb" };
    const char* c = "Ccc";
    s0 += a;
    s1 += b;
    s2 += c;
    cout << " s0 … " << s0 << '\n';
    cout << " s1 … " << s1 << '\n';
    cout << " s2 … " << s2 << "\n\n";

    cout << "◆append による追加更新\n";
    cout << " s0.append(a);\n";
    cout << " s1.append(b);\n";
    cout << " s2.append(c);\n";
    s0.append(a);
    s1.append(b);
    s2.append(c);
    cout << " s0 … " << s0 << '\n';
    cout << " s1 … " << s1 << '\n';
    cout << " s2 … " << s2 << "\n\n";

    cout << " s0.append(s1, 2, 3);\n";
    cout << " s1.append(3, 'z');\n";
    cout << " s2.append(s1.begin() + 9, "
            "s1.end());\n";
    s0.append(s1, 2, 3);
    s1.append(3, 'z');
    s2.append(s1.begin() + 9, s1.end());
    cout << " s0 … " << s0 << '\n';
    cout << " s1 … " << s1 << '\n';
    cout << " s2 … " << s2 << '\n';
}