Write a function which takes an integer array and its size as 
parameter. Your function will
reverse the order of the elements in the array

eg if the array is:
{4,5,2,1,8}

after the function is called, it will be:
{8,1,2,5,4}


Hint: note that if you send an array to a function as a parameter and 
then change the values in
array within the function, these values will be changed outside of the 
function also (unlike the
ordinary variables. For variables we have to use pointers for this 
purpose)

Eg:

#include<stdio.h>

void changeArr(int arr[], int size){
	int i;
	for(i=0; i<size; i++){
		arr[i] = i+2;
	}
}

int main(){
	int i;
	int arr[3] = {10,20,30};
	changeArr(arr,3);
	for(i=0; i<3; i++){
		printf("%d ",arr[i]);
	}
	return 0;
}

///////////////////////////////////
The program above will output 
2 3 4
since the values in the array are changed within the function
(thus it will not output 10 20 30)