C++ simple two-dimensional array overwritten by last input - c++

Question

So I've run into a problem while writing this simple line of code for a school project. What happens is that after asking for user input to fill an array with values, the input for the last column overwrites all the other columns. I've tried finding the problem myself but I just can't seem to find it!
Part of the code that I think is problematic:
for (col = 0; col < arraywidth; col++) {
for (row = 0; row < arrayheight; row++) {
cout << "Please input a value for element " << col << ", " << row << "." << endl;
cin >> T[col][row];
}
}
Thanks for your help. Here's the full code:
#include <iostream>
using namespace std;
int main()
{
// ------------- Variables ---------------------------------
int arrayheight, arraywidth, col, row, maxe, pos_c, T[arrayheight][arraywidth];
// ---------------------------------------------------------
// ------------- Array Creation & Filling ------------------
cout << "Please insert the height of the array." << endl;
cin >> arrayheight;
cout << "Please insert the width of the array." << endl;
cin >> arraywidth;
cout << "Now we will be inputting values in the two-dimensional array." << endl;
for (col = 0; col < arraywidth; col++) {
for (row = 0; row < arrayheight; row++) {
cout << "Please input a value for the element " << col << ", " << row << "." << endl;
cin >> T[col][row];
}
}
// ---------------------------------------------------------
// ------------- Displaying the Array ----------------------
cout << "Now we will be displaying the array." << endl;
for (col = 0; col < arraywidth; col++) {
cout << endl;
for (roaw = 0; row < arrayheight; row++) {
cout << T[col][row] << " | ";
}
}
// ---------------------------------------------------------
// ------------- Logical Function as Requested -------------
cout << " " << endl;
for (col = 0; col < arraywidth; col++) {
maxe = -99;
for (row = 0; row < arrayheight; row++) {
if (T[col][row] > maxe) {
maxe = T[col][row];
pos_c = col;
}
}
cout << "The maximum value of the column " << col << " " << "is " << maxe << endl;
}
// ---------------------------------------------------------
return 0;
}
Picture of what happens:

Answer 1

You have the declaration of the array t[arrayheight][arraywidth] before you assign to those variables. You need to move that declaration down to after the variables are read from the user.
Also, C++ doesn't allow variable-length arrays -- that's a G++ extension. You should use std::vector<std::vector<int>> or dynamic allocation with new.