1. 初始化的几种方法和错误案例
首先当然是包含头文件了:
#include<string>
下面是几种初始化的方法,直接上代码了:
string s1("Hello");
cout <<"s1= "<< s1 << endl;
string s2(8, '*');
cout << "s2= "<<s2 << endl;
string s3 = "Liubing";
cout << "s3= " << s3<<endl;
string s4;
s4 = 'F';
cout << "s4= " << s4 << endl;
几种错误写法:
- string s4=‘F’; 错误!但是上面代码里的那种s4写法是可以的。
- string s5=1; 错误!
- string s5;s5=1; 不报错,但是运行结果显示不出来。
2. 常用的成员函数及基本操作
这些用法主要包括,赋值、连接字符串、替换、删除等等,具体看代码,为了当做练习,就特意编了个练练手:
cout << "length of s1: " << s1.length() << " or " << s1.size()<<endl;
string s5 = s1;
cout << "s5= " << s5 << endl;
s5 += s3;
cout << "s5+s3= " << s5 << endl;
string s6;
s6 = s5.substr(5, 7);
cout << "Name: " << s6 << endl;
string s7(" is a student from ZJU");
s6.insert(7, s7);
cout << "Insert campus info: " << s6 << endl;
int p = s7.find("ZJU");
cout << "String ZJU is at " << p << endl;
string s8("SDU");
s7.replace(p, 3, s8);
s3.insert(7, s7);
cout << "Replace campus info: " << s3 << endl;
int p1 = s3.find(" is a student");
s3.erase(p1);
cout << "Delete the campus info: " << s3 << endl;
课上老师说,以后尽量别用char什么的了,就用string吧。想了想,string的好处主要是因为有这么多好用的成员函数,这可能是它的优越之处吧。
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