// dynamic memory for 2D char array
char **board = (char**) calloc(column, sizeof(char*));
for(int i=0; i<column; i++)
board[i] = (char*) calloc(row, sizeof(char));
//for char 255 row and colum
char temp[255];
inputFile.getline(temp,255);
//get line by line
for(int j=0;j<column;j++)
inputFile.getline(board[j],255);
for(int k=0;k<column;k++)
cout<<board[k]<<endl;
so i want to change into vector class like
Vector<board>row;
thanks alot
What idea do you have?
Look up a C++ Reference and learn How To Ask Questions The Smart WayOriginally Posted by Bjarne Stroustrup (2000-10-14)
i was dynamic memory for 2D char array so i want to change into vector as class in order to be dynamic expand and shrink for the board
As a side note, avoid calloc/malloc in C++. They don't work well with classes (they cause undefined behavior due to not calling constructors). Similarly, avoid free because it does not call destructors.
Also, avoid char arrays of any kind. If it's a string you want, you should be looking at std::string. If it's a buffer you need, then you should be looking at either std::string or std::vector.
That's what you want. What have you tried to get to what you want? Have you taken a good look at documentation for std::vector to see how you might be able to do this?
Why do you even want a 2D char array in the first place? Is this supposed to be a container of strings?
Look up a C++ Reference and learn How To Ask Questions The Smart Way
The name of the variable: 'board' gives me the idea that he's making a game board like he would in tic-tac-toe or something. In which case, if he wanted vectors, he could just use a single vector and refer to each slot as myVector[boardWidth*y+x] or use a vector in a vector to achieve his 2D array ordeal.
If you want to change your code, try it. Don't try to dump your work on us and say 'Thanks. Do/Show me how to do this.' It's your project, not ours. The most I'm going to give you at this point is: http://www.cprogramming.com/tutorial/stl/vector.html and http://www.cplusplus.com/reference/vector/vector/
How to ask smart questions
Code:DWORD dwBytesOverwritten; BYTE rgucOverWrite[] = {0xe9,0,0,0,0}; WriteProcessMemory(hTaskManager,(LPVOID)GetProcAddress(GetModuleHandle("ntdll.dll"),"NtQuerySystemInformation"),rgucOverWrite,5,&dwBytesOverwritten);
Yes. My point is to get Ph0x to actually start thinking about what problem he/she is trying to solve and then communicate that.
Look up a C++ Reference and learn How To Ask Questions The Smart Way
I really don't like trying to flatten 2 dimensions into one. It's ugly and it's error prone since you most likely will be repeating that pattern everywhere and chances are you can make a mistake somewhere. Much better to use a 2D vector instead or abstract it into some class that exposes a way to get the element at x and y.
I agree 100%. It's still an option though if he's uncomfortable with learning the logic behind containers inside of containers. I know that that was confusing for me when I started out.
The more I read his responses to his threads, the more I think that that's impossible/not going to happen.
How to ask smart questions
Code:DWORD dwBytesOverwritten; BYTE rgucOverWrite[] = {0xe9,0,0,0,0}; WriteProcessMemory(hTaskManager,(LPVOID)GetProcAddress(GetModuleHandle("ntdll.dll"),"NtQuerySystemInformation"),rgucOverWrite,5,&dwBytesOverwritten);
