string，char，const char互相转化--C++学习

1. string转const char*

   string s = “abc”;
   const char* c_s = s.c_str();

2. const char*转string
   直接赋值即可

   const char* c_s = “abc”;
   string s(c_s);

3. string转char*

   string s = “abc”;
   char* c;
   const int len = s.length();
   c = new char[len+1];
   strcpy(c,s.c_str());

4. char*转string

   char* c = “abc”;
   string s©;

5. const char转char

   const char* cpc = “abc”;
   char* pc = new char[100];//足够长
   strcpy(pc,cpc);

6. char转const char
   直接赋值即可

   char* pc = “abc”;
   const char* cpc = pc;