Size of matrix

Question

If I globally declare a 2D matrix, say,
int MAT[ ][ ];
then can I set the row size and column size of MAT later on in some other function? The required row and column number varies for different cases. I could just declare it as MAT[100][100]; because row,column is within 100. But I want to save memory.

Answer 1

Array size can't be changed dynamically.