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general questions

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I have a simple questions if anyone can help. Here they are: 1) Can someone explain what a abstract data types are and what abstact base class are. If there is such a thing, what is a abstract function? What is the difference between a abstract class and a normal class which I think is called a concrete class? 2) Why is it you can''t do void function(int a[][9]) {} main() { int a[10][9]; function(a); } you have to do it like this void function(int a[][9]) {} main() { int a[10][9]; function(a); } but you can do this void function(int *) {} main() { int a[10]; function(a); } 3)What''s the difference between private and protected data types? Thank you all for your help in advance. Braves

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