Several problems are apparent.
(a) Turn is not initialized so will definitely be wrong
(b) loop variable j run 0 to 3 inclusive (j<4). so you access undefined memory locations in rot.
(c) rot is local only to the function rotate so the whole function is pointless. [make it global if you want it to work like that]
(d) clrscr; is incorrect, you must have it as clrscr(); if it doesn't take any parameters.
(e) I am sure you have function copy wrong, you use  rather than .
Hi, as I was told that my code doesn’t scale well at all, I thought perhaps I’d try to get a better understanding of interfaces/abstract classes and classes and the relationship between them.
I don’t want at this stage work on a big separate project as I've already got plenty ...
I am writing a java program that needs to execute shell commands, so I wrote a function that would take the command to execute as a string (ie: "mkdir ~/Folder1") and execute that command with the shell. Here is the function:
Runtime run = Runtime.getRuntime();
Process pr = ...
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