Explain

Question

a[a[2]]

Answer 1

Ajith your posted lines of code have many problems like first a is not declared so instead of x you have to use a than which elements you will aceess is out of bound like this way
a[2]=3
a[a[2]= a[3] = garbage value as length of array is 3 and you are accessing 4th element of array which resulted in garbage value.

Answer 2

Example
a=[1, 2,0]
a[2] = 0
a[a[2]]=a[0]=1

Answer 3

will make an IndexOutOfBoundError because a[2]=3 and max Index is 2.

Answer 4

int x[3]={1,2,3};
Printf("%d"a[a[2]]);

Answer 5

Thank you guys