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• 对于字符串string的额外操作

  const char *cp = "Hello world!!!!";char noNuLL[] = { 'H', 'i' };string s1(cp);string s2(noNuLL, 2);string s3(noNuLL);//错误字符串需要以/0为结束符string s4(cp + 6, 5);string s5(s1, 6, 5);string p("Helo World!!!");string p2 = p.substr(0, 5);string p3 = p.substr(5);string p4 = p.substr(6, 11);cout << p << endl;cout << p2 << endl;cout << p3 << endl;cout << p4 << endl;

  字符串操作	含义
  s.insert(pos,args)	pos可以是下标或者迭代器，或者说所有线性存储容器都支持下标设置
  s.erase(pos,len)	删除pos位置上长度为len个字符
  s.append(args)	在s末尾添加args然后返回一个s的引用
  s.assign(args)	这是一个替换函数。用args替换s中的字符串
  s.replace(range,args)	删除s中范围range内的字符并且用args替换

#include
     
      #include
      
       #include 
       
        using namespace std;void replace_string(string&s, const string &oldVal, const string &newVal){    auto l = oldVal.size();    if (!l)        return;//表示要查找的字符串为空    auto iter = s.begin();    while (iter <= s.end() - 1)    {        auto iter1 = iter;        auto iter2 = oldVal.begin();        while (iter2 != oldVal.end() && *iter1 == *iter2)        {            iter1++;            iter2++;        }        if (iter2 == oldVal.end())        {            iter = s.erase(iter, iter1);//由后至前逐个插入            if (newVal.size())            {                iter2 = newVal.end();                do                {                    iter2--;                    iter2 = s.insert(iter, *iter2);                } while (iter2 > newVal.begin());            }            iter += newVal.size();        }        else            iter++;    }}int main(int argc, char **argv){    //////////////////////////////////////////////////////////////////////////    //string操作    const char *cp = "Hello world!!!!";    char noNuLL[] = { 'H', 'i' };    string s1(cp);    string s2(noNuLL, 2);    string s3(noNuLL);//错误字符串需要以/0为结束符    string s4(cp + 6, 5);    string s5(s1, 6, 5);    string p("Helo World!!!");    string p2 = p.substr(0, 5);    string p3 = p.substr(5);    string p4 = p.substr(6, 11);    cout << p << endl;    cout << p2 << endl;    cout << p3 << endl;    cout << p4 << endl;    //string p5 = p.substr(16);//字符串数组越界，抛出异常    //////////////////////////////////////////////////////////////////////////    //9.41    vector
        
         vc{ 'g', 'f', 's', 'b', 'a' };    string s(vc.data(), vc.size());    cout << s<
         
          > c)            s.push_back(c);    }