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## CHAPTER 1

### Exercise 1

``````	let months = 12
let daysInWeek = 7
let weeks = 52``````

### Exercise 2

``````	var gender = "Female"
var weight = 102.5      // in pounds
var height = 1.72       // in meters
var DOB = "09/25/1970"  // mm/dd/yyyy``````

### Exercise 3

``````	println("Gender: \(gender)")
println("Weight: \(weight) pounds")
println("Height: \(height) meters")
println("DOB: \(DOB)")``````

### Exercise 4

``````	var weight = 102.5      // in pounds
var str = "Your weight is \(weight) pounds"``````

## CHAPTER 2

### Exercise 1

The problem with the code is that `weightInPounds` is inferred to be of type `Int`, which will cause the error when using it to multiply other `Double` values.

The first way to fix this is to ensure that you assign a floating‐point value to `weightInPounds` so that the compiler can infer it to be of type `Double`:

``````	var weightInPounds = 154.0
var heightInInches = 66.9
var BMI = (weightInPounds / pow(heightInInches,2)) * 703.06957964
println(BMI)``````

The second approach is to explicitly declare `weightInPounds` as a `Double`:

``````	var weightInPounds:Double = 154
var heightInInches = 66.9
var BMI = (weightInPounds / pow(heightInInches,2)) * 703.06957964
println(BMI)``````

The third approach is to explicitly perform a cast on `weightInPounds` and `heightInInches` when performing the calculations:

``````	var weightInPounds = 154
var heightInInches = 66.9
var BMI = (Double(weightInPounds) / pow(Double(heightInInches),2)) * 703.06957964
println(BMI)``````

### Exercise 2

The output for the following statements is as follows. (The statements in bold ...

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