05.0.md

eBook/exercises/chapter_5/bitwise_complement.go

@@ -0,0 +1,22 @@
+package main
+
+import "fmt"
+
+func main() {
+	for i:=0; i <= 10; i ++ {
+			fmt.Printf("the complement of %b is: %b\n", i, ^i)
+	}
+}
+/* Output:
+the complement of 0 is: -1
+the complement of 1 is: -10
+the complement of 10 is: -11
+the complement of 11 is: -100
+the complement of 100 is: -101
+the complement of 101 is: -110
+the complement of 110 is: -111
+the complement of 111 is: -1000
+the complement of 1000 is: -1001
+the complement of 1001 is: -1010
+the complement of 1010 is: -1011
+*/

eBook/exercises/chapter_5/fizzbuzz.go

@@ -0,0 +1,24 @@
+package main
+
+import "fmt"
+
+const (
+	FIZZ=3
+	BUZZ=5
+	FIZZBUZZ=15
+)
+
+func main() {
+	for i:=0; i <= 100; i++ {
+		switch {
+			case i%FIZZBUZZ==0:
+				fmt.Println("FizzBuzz")
+			case i%FIZZ==0:
+				fmt.Println("Fizz")
+			case i%BUZZ==0:
+				fmt.Println("Buzz")
+			default:
+				fmt.Println(i)
+		}
+	}
+}

eBook/exercises/chapter_5/for_character.go

@@ -0,0 +1,17 @@
+package main
+
+func main() {
+	// 1 - use 2 nested for loops
+	for i:=1; i <= 25; i++ {
+		for j:=1; j <=i; j++ {
+			print("G")
+		}
+		println()
+	}
+	// 2 -  use only one for loop and string concatenation
+	str := "G"
+	for i:=1; i <= 25; i++ {
+		println(str)
+		str += "G"
+	}	
+}

eBook/exercises/chapter_5/for_loop.go

@@ -0,0 +1,16 @@
+package main
+
+import "fmt"
+
+func main() {
+	// 1:
+	for i:=0; i < 15; i++ {
+		fmt.Printf("The counter is at %d\n", i)
+	}
+	// 2:
+	i := 0
+START:
+	fmt.Printf("The counter is at %d\n", i)
+	i++
+	if i < 15 { goto START }
+}

eBook/exercises/chapter_5/i_undefined.go

@@ -0,0 +1,14 @@
+// i_undefined.go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	var i int
+	for i=0; i<10; i++ {
+		fmt.Printf("%v\n", i)
+	}
+	fmt.Printf("%v\n", i)  //<-- compile error:  undefined i
+}

eBook/exercises/chapter_5/multiple_for.go

@@ -0,0 +1,17 @@
+// multiple_for.go
+package main
+
+import "fmt"
+
+func main() {
+    //multiple initialization; a consolidated bool expression with && and ||; multiple ‘incrementation’
+    for i, j, s := 0, 5, "a"; i < 3 && j < 100 && s != "aaaaa"; i, j, s = i+1, 
+		j+1, s + "a"  {
+        fmt.Println("Value of i, j, s:", i, j, s)
+    }
+}
+/* Output:
+Value of i, j, s: 0 5 a
+Value of i, j, s: 1 6 aa
+Value of i, j, s: 2 7 aaa
+*/

eBook/exercises/chapter_5/rectangle_stars.go

@@ -0,0 +1,26 @@
+// rectangle_stars.go
+package main
+
+import "fmt"
+
+func main() {
+	w, h := 20, 10
+	for y := 0; y < h; y++ {
+		for x := 0; x < w; x++ {
+			fmt.Print("*")
+		}
+		fmt.Println()
+	}
+}
+/* Output:
+********************
+********************
+********************
+********************
+********************
+********************
+********************
+********************
+********************
+********************
+*/

eBook/exercises/chapter_5/season.go

@@ -0,0 +1,17 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Printf(Season(3))
+}
+
+func Season(month int) string {
+	switch month {
+		case 12,1,2:  return "Winter"
+		case 3,4,5:	  return "Spring"
+		case 6,7,8:   return "Summer"
+		case 9,10,11: return "Autumn"
+	}
+	return "Season unknown"
+}