Control Flow Tutorial

Author: Rajeev Kumar Singh

tutorial3-constants/constants.go renamed to tutorial4-constants/constants.go

@@ -0,0 +1,11 @@
+package main
+import "fmt"
+
+func main() {
+	for num := 1; num <= 100; num++ {
+		if num%3 == 0 && num%5 == 0 {
+			fmt.Printf("First positive number divisible by both 3 and 5 is %d\n", num)
+			break
+		}
+	}
+}

tutorial5-control-flow/for-break.go

@@ -0,0 +1,11 @@
+package main
+import "fmt"
+
+func main() {
+	for num := 1; num <= 10; num++ {
+		if num%2 == 0 {
+			continue;
+		}
+		fmt.Printf("%d ", num)
+	}
+}

tutorial5-control-flow/for-continue.go

@@ -0,0 +1,7 @@
+package main
+
+func main() {
+	// Infinite Loop
+	for {
+	}
+}

tutorial5-control-flow/for-infinite.go

@@ -0,0 +1,10 @@
+package main
+import "fmt"
+
+func main() {
+	i := 2
+	for ;i <= 20; {
+		fmt.Printf("%d ", i)
+		i *= 2
+	}
+}

tutorial5-control-flow/for-without-increment.go

@@ -0,0 +1,9 @@
+package main
+import "fmt"
+
+func main() {
+    i := 2
+    for ;i <= 10; i += 2 {
+	    fmt.Printf("%d ", i)
+    }
+}

tutorial5-control-flow/for-without-init.go

@@ -0,0 +1,8 @@
+package main
+import "fmt"
+
+func main() {
+	for i := 0; i < 10; i++ {
+		fmt.Printf("%d ", i)
+	}
+}

tutorial5-control-flow/for.go

@@ -0,0 +1,15 @@
+package main
+import "fmt"
+
+func main() {
+	var BMI = 21.0
+	if BMI < 18.5 {
+		fmt.Println("You are underweight");
+	} else if BMI >= 18.5 && BMI < 25.0 {
+		fmt.Println("Your weight is normal");
+	} else if BMI >= 25.0 && BMI < 30.0 {
+		fmt.Println("You're overweight")
+	} else {
+		fmt.Println("You're obese")
+	}
+}

tutorial5-control-flow/if-else-if.go

@@ -0,0 +1,11 @@
+package main
+import "fmt"
+
+func main() {
+var age = 18
+	if age >= 18 {
+		fmt.Println("You're eligible to vote!")
+	} else {
+		fmt.Println("You're not eligible to vote!")
+	}
+}

tutorial5-control-flow/if-else.go

@@ -0,0 +1,28 @@
+package main
+import "fmt"
+
+func main() {
+	// If Statement
+	var x = 25
+	if(x % 5 == 0) {
+		fmt.Printf("%d is a multiple of 5\n", x)
+	}
+
+	// Parentheses are Optional
+	var y = -1
+	if y < 0 {
+		fmt.Printf("%d is negative\n", y)
+	}
+	
+	// If with a condition consisting of short circuit operators
+	var age = 21
+	if age >= 17 && age <= 30 {
+		fmt.Println("My Age is between 17 and 30")
+	}	
+
+	// If with a short statement	
+	if n := 10; n%2 == 0 {
+		fmt.Printf("%d is even\n", n)
+	} 
+	
+}

tutorial5-control-flow/if.go

@@ -0,0 +1,13 @@
+package main
+import "fmt"
+
+func main() {
+	switch dayOfWeek := 5; dayOfWeek {
+		case 1, 2, 3, 4, 5:
+			fmt.Println("Weekday")
+		case 6, 7:
+			fmt.Println("Weekend")
+		default:
+			fmt.Println("Invalid Day")		
+	}
+}

tutorial5-control-flow/switch-combine-cases.go

@@ -0,0 +1,16 @@
+package main
+import "fmt"
+
+func main() {
+	var BMI = 21.0 
+	switch {
+		case BMI < 18.5:
+			fmt.Println("You're underweight")
+		case BMI >= 18.5 && BMI < 25.0:
+			fmt.Println("Your weight is normal")
+		case BMI >= 25.0 && BMI < 30.0:
+			fmt.Println("You're overweight")
+		default:
+			fmt.Println("You're obese")	
+	}
+}

tutorial5-control-flow/switch-with-no-expression.go

@@ -0,0 +1,22 @@
+package main
+import "fmt"
+
+func main() {
+	var dayOfWeek = 6
+	switch dayOfWeek {
+		case 1: fmt.Println("Monday")
+		case 2: fmt.Println("Tuesday")
+		case 3: fmt.Println("Wednesday")
+		case 4: fmt.Println("Thursday")
+		case 5: fmt.Println("Friday")
+		case 6: {
+			fmt.Println("Saturday")
+			fmt.Println("Weekend. Yaay!")
+		}
+		case 7: {
+			fmt.Println("Sunday")
+			fmt.Println("Weekend. Yaay!")
+		}
+		default: fmt.Println("Invalid day")
+	}
+}