Question

Insert const before any of the following array parameters that can be changed to constant array parameters: void output(double a[], int size); //Precondition: a[0] through a[size - 1] have values. //Postcondition: a[0] through a[size - 1] have been //written out. void drop_odd(int a[], int size); //Precondition: a[0] through a[size - 1] have values. //Postcondition: All odd numbers in a[0] through //a[size - 1] have been changed to 0.

Short answer

Answer: The 'output' function needed the 'const' keyword to be inserted before the 'a[]' parameter because this function only outputs the contents of the array without modifying anything. Adding 'const' ensures that the function does not modify the contents of the input array, preventing unintended behavior.

Step-by-step solution

Function 1: output

For the 'output' function, the input parameters are a double array 'a[]' and an integer 'size'. Since the only purpose of this function is to output the contents of the array without modifying anything, we can make the array parameter 'a[]' constant. The updated function signature should look like this: ```cpp void output(const double a[], int size); ```

Function 2: drop_odd

For the 'drop_odd' function, the input parameters are an integer array 'a[]' and an integer 'size'. This function modifies the contents of the array, specifically changing odd numbers to 0. Because it does modify the array, we cannot make the array parameter 'a[]' constant. Thus, there is no need to add a const keyword in function 2. It should remain as is: ```cpp void drop_odd(int a[], int size); ``` In conclusion, only the 'output' function needed the const keyword to be inserted, ensuring that the function does not modify the contents of the input array.