Chapter 3 Page 55 Mini Exercises (3)

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1

Chapter 3 Page 55 Mini Exercises (3)

It says “Correct the mistake in the above exercise by casting age1 and age2 to Double in the formula”, how can I do it IN the formula?

This is the formula: (age1 + age2) / 2

Thanks

2

In the original formula:

let avg1 = (age1 + age2) / 2

Both operands of / are integers so the operation is an integer division and the result is truncated.

If you cast both age1 and age2 to Double like this:

let avg2 = (Double(age1) + Double(age2)) / 2

The first operand of / is now a Double. Because of this, 2 is inferred to be a Double as well and the result is correct now.