Question

Write some \(\mathrm{C}++\) code that will fill an array a with 20 values of type int read in from the keyboard. You need not write a full program, just the code to do this, but do give the declarations for the array and for all variables.

Short answer

Question: Write code to create an array of integers with a size of 20, and then use a for loop to get input from the user for each element in the array. Answer: ```cpp int a[20]; int i; for (i = 0; i < 20; i++) { std::cin >> a[i]; } ```

Step-by-step solution

Declare the array and required variables

Declare an int array 'a' of size 20 and a variable 'i' which will be used as an iterator in the for loop. ```cpp int a[20]; int i; ```

Use a for loop to iterate through the array

Use a for loop with iterator 'i' and loop from 0 to 19 (inclusive), as the size of our array is 20. ```cpp for (i = 0; i < 20; i++) { // We'll add the input code in the next step } ```

Get input from the user for each element in the array

Inside the for loop, use 'std::cin' to read inputs from the user for each element in the array a[i]. ```cpp for (i = 0; i < 20; i++) { std::cin >> a[i]; } ``` As the question only asks for the specific code to achieve the task and not for a full program, this concludes the solution.