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

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