If you want a user to enter exactly 20 values, which loop would be the best to use?

1. do-while

2. while

3. for

4. infinite

5. None of these

Answer: For loop

Explanation:

Using the for loop we can get the exact number of values/outcomes we require.

For example: printf (enter 20 numbers");

for (int i=0; i<20; i++)

{

scanf ("%d", &number);

}

So, this is an implementation of for loop in C. Using it we can enter exact 20 numbers not less or more than that.

Therefore, for loop is the answer.