【STL】string类

string类简述

#incldue <iostream>
#include <string>
using namespace std;
void main() {
     string s1("Hello");
    cout << s1 << endl;
    string s2(8, 'x');
    cout << s2 << endl;
    string month = "March";
    cout << month << endl;
    string s;
    s = 'n';
    cout << x << endl;
}
/* 输出
    Hello
    xxxxxxxx
    March
    n
 */

• 长度用成员函数 length() 读取

  string的赋值和连接

  
  
  

  比较string

  
  

  求子串

  

  交换string

  

  查找string中的字符

  
  
  
  

  删除string中的字符

  

  替换string中的字符

  
  

  在string中插入字符

  

  将string转换为char*

  
  

  string拷贝

  

  字符串流处理

  

  输入流 istringstream

  ```cpp string input(“Input test 123 4.7 A”); istringstream inputString(input); string string1, string2; int i; double d; char c; inputString >> string1 >> string2 >> i >> d >> c; cout << string1 << endl << string2 << endl; cout << i << endl << d << endl << c <<endl;

long L; if(inputString >> L) cout << “long\n”; else cout << “empty\n”; / 输出 Input test 123 4.7 A empty /

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### 输出流 ostringstream
```cpp
ostringstream outputString;
int a = 10;
outputString << "This " << a << "ok" << endl;
cout << outputString.str();
/* 输出
    This 10ok
 */