Section5.49 - COMPLETE

Section5 - Exercices S1-2-3-4/46.go

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+/*
+Coding Exercise #1
+
+Using the const keyword declare and initialize the following constants:
+
+1. daysWeek with value 7
+
+2. lightSpeed with value 299792458
+
+3. pi with value 3.14159
+
+Run the program without errors.
+
+package main
+
+func main() {
+		const daysWeek   = 7
+		const lightSpeed = 299792458
+		const pi         = 3.14159
+
+}
+*/
+
+/*
+Coding Exercise #2
+
+Change the code from the previous exercise and declare all 3 constants as grouped constants.
+
+Make them untyped.
+
+func main() {
+	const (
+		daysWeek   = 7
+		lightSpeed = 299792458
+		pi         = 3.14159
+	)
+
+}
+*/
+
+/*
+Coding Exercise #3
+
+ Calculate how many seconds are in a year.
+
+ STEPS:
+
+ 1. Declare secPerDay constant and initialize it to the number of seconds in a day
+
+ 2. Declare daysYear constant and initialize it to 365
+
+ 3. Use fmt.Printf() to print out the total number of seconds in a year.
+
+EXPECTED OUTPUT:
+
+There are 31536000 seconds in a year.
+
+package main
+
+import "fmt"
+
+func main() {
+	const (
+		daysYear    = 365
+		hoursDay    = 24
+		secondsHour = 3600
+	)
+	var result = daysYear * hoursDay * secondsHour
+	fmt.Printf("Seconds in a Year %d\n", result)
+}
+*/
+
+/*
+Coding Exercise #4
+
+There are an error in the following Go program. Try to identify the error, change the code and run the program without errors.
+
+    package main
+
+    func main() {
+        const x int = 10
+
+        // declaring a constant of type slice int ([]int)
+        const m = []int{1: 3, 4: 5, 6: 8}
+        _ = m
+    }
+
+package main
+
+func main() {
+	const x int = 10
+
+	// declaring a constant of type slice int ([]int)
+	// const m = []int{1: 3, 4: 5, 6: 8}
+	// You cannot declare a slice constant
+	// _ = m
+}
+
+*/
+
+/*
+Coding Exercise #5
+
+There are some errors in the following Go program. Try to identify the errors, change the code and run the program without errors.
+
+    package main
+
+    import "math"
+
+    func main() {
+    	const a int = 7
+    	const b float64 = 5.6
+    	const c = a * b
+
+    	x := 8
+    	const xc int = x
+
+    	const noIPv6 = math.Pow(2, 128)
+    }
+
+package main
+
+// import "math"
+
+func main() {
+	const a int = 7
+	const b float64 = 5.6
+	const c = float64(a) * b
+
+	x := 8
+	_ = x
+
+	// const xc int = x
+
+	// const noIPv6 = math.Pow(2, 128)
+}
+*/
+
+/*
+Coding Exercise #6
+
+Using Iota declare the following months of the year: Jun, Jul and Aug
+
+Jun, Jul and Aug are constant and their value is 6, 7 and 8.
+*/
+package main
+
+import "fmt"
+
+func main() {
+	const (
+		Jun = iota + 6
+		Jul
+		Aug
+	)
+	fmt.Println(Jun, Jul, Aug)
+}