33-C++中的字符串类

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#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",
        "D.T.Software",
        "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;
}

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#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;
}

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#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 >> 3);

    cout << r << endl;

    return 0;
}