C++超详细讲解字符串类

#include <iostream>
#include <string>
using namespace std;
void string_sort(string a[], int len)
{
    for (int i = 0; i < len; i++)
    {
        for (int j = i; j < len; j++)
        {
            if (a[i] > a[j])
            {
                swap(a[i], a[j]);
            }
        }
    }
}
string string_add(string a[], int len)
{
    string ret = "";
    for (int i = 0; i < len; i++)
    {
        ret += a[i] + ";";
    }
    return ret;
}
int main()
{
    string sa[7] = 
    {
        "Hello World",
        "AutumnZe",
        "C#",
        "Java",
        "C++",
        "Python",
        "TypeScript"
    };
     string_sort(sa, 7);
     for(int i = 0; i < 7; i++)
     {
        cout << sa[i] <<endl;
     }
     cout << endl;
     cout << string_add(sa, 7) << endl;
     return 0;
}

istringstream iss("123.45");
double num;
iss > > num;

ostringstream oss;
oss << 543.21;
string s = oss.str();

#include <iostream>
#include <sstream>
#include <string>
using namespace std;
#define TO_NUMBER(s, n) (istringstream(s) >> n)
#define TO_STRING(n) (((ostringstream&)(ostringstream() << n)).str())
int main()
{
    double n = 0;
    if (TO_NUMBER("234.567", n))
    {
        cout << n << endl;
    }
    string s = TO_STRING(12345);
    cout << s << endl;
    return 0;
}

#include <iostream>
#include <string>
using namespace std;
string operator >> (const string& s, unsigned int n)
{
    string ret = "";
    unsigned int pos = 0;
    n = n % s.length();
    pos = s.length() - n;
    ret = s.substr(pos);
    ret += s.substr(0, pos);
    return ret;
}
int main()
{
    string s = "abcdefg";
    string r = (s >> 8);
    cout << r << endl;
    return 0;
}