Explain how to use a for loop to perform an arithmetic operation on each element in an array.

What will be an ideal response?

You can use a for loop to perform arithmetic on each element in an array. For example:
for(int subscript = 0; subscript < 5; ++subscript)
myScores[subscript] += 3;
The variable subscript is declared and initialized to 0, then compared to the length of the array (in this case, 5). Because it is less than 5, the loop executes and myScores[0] increases by 3. The variable subscript is incremented and becomes 1, which is still less than 5. So when the loop executes again, myScores[1] increases by 3, and so on.