[基础-001]C++字符串转换(char*，const char*，string)

1. string转const char*

string str ="abc";
const char* charArr = str.c_str();

2. const char*转string

const char* charArr = "abc";
string str(charArr);

3. string转char*

string str ="abc";
char* charArr;
const int len = str.length();
charArr =new char[len+1];
strcpy(charArr, str.c_str());

4. char*转string

char* charArr ="abc";
string str(c);

5. const char*转char*

const char* charArr1 ="abc";
char* charArr2 = new char[100]; // 足够长
strcpy(charArr1, charArr2)