Question

Each of the following definitions and program segments has errors. Locate as many as you can. int values[20], *iptr = nullptr; iptr = values; iptr *= 2;

Short answer

Answer: The primary error in the given code segment is trying to multiply the pointer 'iptr' with a constant value, which is invalid in C++. To correct the error, we should use pointer arithmetic and increment the pointer by a certain number of elements. In this case, increment the pointer 'iptr' by 2 elements using `iptr += 2;`.

Step-by-step solution

- Declare an array and initialize a pointer

The first two lines of code are initializing an array of 20 integers and a pointer to nullptr. These lines are correct, as they don't cause any errors. ``` int values[20], *iptr = nullptr; ```

- Assigning the address of the array to the pointer

The next line of code assigns the address of the first element in the array 'values' to the pointer 'iptr'. This line is also correct and does not cause any errors. ``` iptr = values; ```

- Identify and correct the error with the pointer operation

The last line of code tries to multiply the pointer 'iptr' with the constant value '2'. This operation is invalid in C++ and will cause an error. Instead, we should increment the pointer by a certain number of elements, using pointer arithmetic. To fix this error, replace the invalid line with the following line, where the pointer 'iptr' is incremented by 2 elements (since each element in the array is of type 'int'): ``` iptr += 2; ``` The corrected code should now look like this: ``` int values[20], *iptr = nullptr; iptr = values; iptr += 2; ```