Section11-5

Section11/89-3.go

@@ -15,3 +15,18 @@ Coding Exercise #3
 
 7. Print out the nums slice
 */
+package main
+
+import "fmt"
+
+func main() {
+	nums := []float64{1.1, 2.1, 3.1}
+	nums = append(nums, 10.1)
+	fmt.Println(nums)
+	nums = append(nums, 4.1, 5.5, 6.6)
+	fmt.Println(nums)
+
+	n := []float64{8.1, 9.3}
+	nums = append(nums, n...)
+	fmt.Println(nums)
+}

Section11/89-4.go

@@ -0,0 +1,58 @@
+/*
+Create a Go program that reads some numbers from the command line and then 
+calculates the sum and the product of all the numbers given at the command line.
+
+The user should give between 2 and 10 numbers.
+
+Notes:
+
+- the program should be run in a terminal (go run main.go) not in Go Playground
+
+- example:
+
+go run main.go 3 2 5
+
+Expected output: Sum: 10, Product: 30
+*/
+
+// run this program in a terminal with arguments
+// ex: go run main.go 5 7.1 9.9 10
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+)
+
+func main() {
+
+	if len(os.Args) < 2 { //if not run with arguments
+		log.Fatal("Please run the program with arguments (2-10 numbers)!")
+
+	}
+
+	//taking the arguments in a new slice
+	args := os.Args[1:]
+
+	// declaring and initializing sum and product of type float64
+	sum, product := 0., 1.
+
+	if len(args) < 2 || len(args) > 10 {
+		fmt.Println("Please enter between 2 and 10 numbers!")
+	} else {
+
+		for _, v := range args {
+			num, err := strconv.ParseFloat(v, 64)
+			if err != nil {
+				continue //if it can't convert string to float64, continue with the next number
+			}
+			sum += num
+			product *= num
+		}
+	}
+
+	fmt.Printf("Sum: %v, Product: %v\n", sum, product)
+}

Section11/89-5.go

@@ -0,0 +1,24 @@
+/*
+Consider the following slice declaration:
+nums := []int{5, -1, 9, 10, 1100, 6, -1, 6}
+
+Using a slice expression and a for loop iterate over
+the slice ignoring the first and the last two elements.
+
+Print those elements and their sum.
+*/
+
+package main
+
+import "fmt"
+
+func main() {
+	nums := []int{5, -1, 9, 10, 1100, 6, -1, 6}
+	sum := 0
+	for _, v := range nums[2 : len(nums)-2] {
+		fmt.Println(v)
+		sum += v
+	}
+	fmt.Println("Sum:", sum)
+
+}