C++ Primer Plus学习笔记第十七章内核格式化

叁歲伎倆 2021-12-19 02:43 239阅读 0赞

sstream族提供与iosream相同的接口提供程序与string对象之间的I/O  
读取string对象中的格式化信息和将格式化信息写入到string对象中称为内核格式化（。。。跟内核有毛关系啊）

string：sstream

char字符数组: strstream.h

sstream -> ostringstream string对象的输入流类

-> wostringstream 宽字符的

str()终结修改缓冲区内容

#include <iostream>
    // 来自sstream头
    #include <sstream>
    #include <string>
    int main()
    {
      using namespace std;
    // 声明outstr对象
      ostringstream outstr;
      string hdisk;
      cout << "What's the name of your hard disk? ";
      getline(cin, hdisk);
      int cap;
      cout << "What's its capacity in GB? ";
      cin >> cap;
    // 将string写入到outstr缓冲区中
      outstr << "The hard disk " << hdisk << " has a capacity of "
           << cap << " gigabytes.\n";
    // 冻结！ the end!
      string result = outstr.str();
    // 输出到终端
      cout << result;
    
      return 0;

![20190702102030483.png][]

sstream -> istringstream 输出流,初始化的时候与相关的string对象做绑定 然后可以取出相关的字符串

#include <iostream>
    #include <sstream>
    #include <string>
    
    int main()
    {
      using namespace std;
      string lit = "It was a dark and stormy day, and "
                   " the full moon glowed brilliantly. ";
    // 初始化的时候需要绑定相应的对象
      istringstream instr(lit);
      string word;
    // 重载了operator>>()
      while(instr >> word)
        cout << word << endl;
      return 0;
    }

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70][]

总结

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NvdWx3eWI_size_16_color_FFFFFF_t_70 2][]

![20190702110026946.png][]

感天动地  17章终于完结了

[20190702102030483.png]: /images/20211219/39ca9380de594c56888cc2c684e72ab2.png
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[20190702110026946.png]: /images/20211219/36f70f1553b944aa9bccb0080617c7b7.png