#include <iostream>
using namespace std;
#include <string>
void test01()
{
string str1 = "hello";
str1.insert(1, "qq");
cout << str1 << endl;//插入
str1.erase(1, 2);
cout << str1 << endl;//删除
string str = "abcdef";//截取
string subStr = str.substr(1, 3);
cout << subStr << endl;
}
void test02()//截取应用
{
string email = "zhansan@singa.com";
//得到用户名
int pos = email.find("@");
string subStr = email.substr(0,pos);
cout << subStr << endl;
}
int main()
{
test01();
test02();
system("pause");
return 0;
}
![](https://img.haomeiwen.com/i9583580/9bfaf10666005ad1.png)
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