Function arguement

#1

difference between
(int a[ ]) and (int &a) and (int *a)

#2

int a[] is to initialize an array(when array size is not mentioned). In such a case, you have to initialize the array in the same line where you declare it.
Example: int a[]={1,2,3,4}

int &a is a reference variable. It is used to make a copy of another variable.
Example:
int x=10;
int &y=x;//Initializing a reference variable. Variable y is another name for x. So whatever changes you make in x, it will be reflected in y.

int *a is a pointer variable(used to store address).

In terms of function defination:
func(int a[]) and func(int *a) means the same thing. Both the way can be used if array is passed .
func(int &a) means an integer is passed to the function by reference. So whatever changes made to this variable inside the function will be reflected back in the main (from where the function was called).

#3

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