string类的八个构造函数用法

来源：互联网发布：coc兵种升级数据2017 编辑：程序博客网时间：2024/05/16 09:07

//str1.cpp -- introducing the string class#include <iostream>#include <string>//using string constructorsint main(){using namespace std;string one("Lottery Winner");  //第一种构造函数cout << one << endl;           //"<<"运算符的重载用法string two (20, '$');          //创建一个包含n个元素的对象，其中每个元素都被初始化为‘$’字符cout << two <<endl;string three(one);             //将three对象初始化为one对象（使用复制构造函数）cout << three << endl;one += "Oops";                 //"+="运算符的重载用法cout << one << endl;two = "Sorry! That was ";three[0] = 'p';                //'[]'运算符的重载用法string four;                   //默认构造函数four = two + three;cout << four << endl;char alls[] = "All's well that ends well ";string five(alls, 20);         //将five对象初始化为alls所指向的字符串的前20个字符cout << five << endl;string six( alls + 6, alls + 10); //将six对象初始化为alls+6和alls+10之间的字符，包括alls+6但不包括alls+10cout << six << ",";string seven ( &five[6], &five[10]);  //构造函数同上，不同的是参数形式有所变化cout << seven << "...\n";string eight(four, 7, 16);cout << eight << " in motion " << endl;cin.get();return 0;}

测试效果如图：

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