c++学习（五）：new char[]的赋值

1.strcpy

        string str = "mystring"; int num = strlen(str.c_str()) +1; char* strchar = new char[num];        strcpy(strchar, str.c_str()); if (strchar!=NULL) { delete []strchar; strchar = NULL; }

2.memcpy

        string str = "mystring";

int num = strlen(str.c_str()) +1;

char* strchar1 = new char[num]; memcpy(strchar1, str.c_str(), num); if (strchar1!=NULL) { delete []strchar1; strchar1 = NULL; }

3.不能直接赋值为字符串常量。这样的话，char 的地址发生变化， delete crash.

char* strchar2 = new char[num]; strchar2 = "mystring";///wrong