C++内存管理问题，如何删除char *

Question

以下代码为什么会报错，以及如何正确删除ch，释放内存。

char *ch = new char(100);
char tmp[10] = "e100";
strtod(tmp, &ch);
cout << *ch << endl;
delete ch;
system("pause");

Answer 1

You wrote it wrong, it should be new char[100], and the delete statement should be delete[] ch. New char(100) means to construct a char and initialize the value to 100.

Answer 2

The usage of strtod function is wrong here - it’s okay to say that ch is not initialized

Please check strtod usage:
http://baike.baidu.com/view/1876981.h...

ch has not been initialized, and its content is uncertain. It is very likely that strtod will not encounter the end of string symbol ("NULL")

Also, the last sentence delete[] ch is better.