read from the file into a 2d array

[xxzl]

how to read the file into 2d array without knowing its size?

[weaknessforcats]

First, read this: http://bytes.com/topic/c/insights/77...rrays-revealed. Here you will learn that there really are not 2D arrays in C or C++.

Second, find out the format the file.

Third, count the numbers in the file.

Fourth, dynamically allocate memory to hold those numbers. That is, use malloc() if you write in C or the new operator if you write in C++.

Fifth, read the numbers from the file into your allocated memory

Sixth, create a pointer to an array[x][y] where y is the columns and x is the number of rows. Place the address of your allocation in this pointer.

Seventh, access your array only through this pointer. Your view will be a 2D array.