Searching & Merging In One Dimensional Array

In C Programming, If we need to store word “INDIA” then syntax is as below –
char name[];
name = “INDIA”

What will be printed after execution of the following code?

void main()
{
      int arr[10] = {1,2,3,4,5};
      cout<< arr[5];
}

What will be the output of the program ?

#include"stdio.h"
int main()
{
    	int a[5] = {51, 1, 5, 20, 25};
    	int x, y, z;
    	x = ++a[1];
    	y = a[1]++;
    	z = a[x++];
    	cout<<x<<y<<z;
	return 0;
}

Let x be an array. Which of the following operations are illegal?
I. ++x
II. x+1
III. x++
IV. x*2