我有一个问题请教各位。In C++, I want to change “char array[40];” to be dynamical. 也就是 the size of array 不固定。请问如何转变？是用 char* array ? 还是用 string array ? 多谢！

I'm working on a small project here, and need to change all spaces in a char array to underscores. Meaning that "One Two Three" is changed to "One_Two_Three".<BR><BR ...