Final answer:
The value of ia[0] is 0.
Step-by-step explanation:
The value of ia[0] can be determined by following the given code. In the code snippet, we have an integer array ia[2] and a pointer *ip. The pointer ip is assigned the address of the first element of the array ia. Therefore, *ip refers to the value stored in the first element of the array.
Next, the first element of the array is assigned the value of *ip minus 1. Since the initial value of *ip was 1, subtracting 1 gives us 0. Therefore, ia[0] will have the value of 0.