Section5.46

Section5/45.go

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+/*
+Coding Exercise #1
+
+    Using the var keyword, declare 4 variables called a, b, c, d of type int, float64, bool and string.
+
+    Using short declaration syntax declare and assign these values to variables x, y and z:
+
+    - 20
+
+    - 15.5
+
+    - "Gopher!"
+
+    Using fmt.Println() print out the values of a, b, c, d, x, y and z.
+
+    Try to run the program without error.
+
+package main
+
+import "fmt"
+
+func main() {
+	var a int
+	var b float64
+	var c bool
+	var d string
+	x := 20
+	y := 15.5
+	z := "Gopher!"
+
+	fmt.Println(a, b, c, d)
+	fmt.Println("X is", x, "\nY is", y, "\nZ is", z)
+}
+*/
+
+/*
+Coding Exercise #2
+
+Change the code from the previous exercise in the following way:
+
+1. Declare a, b, c, d using a single var keyword (multiple variable declaration) for better readability.
+
+2. Declare x, y and z on a single line -> multiple short declarations
+
+3. Remove the statement that prints out the variables. See the error!
+
+4. Change the program to run without error using the blank identifier (_)
+
+Are you stuck? Do you want to see the solution for this exercise? Click here.
+
+package main
+
+func main() {
+	var (
+		a int
+		b float64
+		c bool
+		d string
+	)
+
+	x, y, z := 20, 15.5, "Gopher!"
+
+	_, _, _, _, _, _, _ = a, b, c, d, x, y, z
+}
+*/
+
+/*
+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
+
+    func main() {
+        var a float64 = 7.1
+
+        x, y := true, 3.7
+
+        a, x := 5.5, false
+
+        _, _, _ = a, x, y
+    }
+
+
+package main
+
+func main() {
+	var a float64 = 7.1
+
+	x, y := true, 3.7
+
+	a, x = 5.5, false
+
+	_, _, _ = a, x, y
+}
+*/
+
+/*
+Coding Exercise #4
+
+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
+
+    version := "3.1"
+
+    func main() {
+    	name := 'Golang'
+    	fmt.Println(name)
+    }
+*/
+
+package main
+
+import "fmt"
+
+var version = "3.1"
+
+func main() {
+	name := "Golang"
+	fmt.Println(name)
+}

Section5/46.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)
+}