Mini-exercises

1. Create a constant called age1 and set it equal to 42. Create a constant called age2 and set it equal to 21. Check using Option-click that the type for both has been inferred correctly as Int.
2. Create a constant called avg1 and set it equal to the average of age1 and age2 using the naïve operation (age1 + age2) / 2. Use Option-click to check the type and check the result of avg1. Why is it wrong?
3. Correct the mistake in the above exercise by casting age1 and age2 to Double in the formula. Use Option-click to check the type and check the result of avg1. Why is it now correct?