exercices of section 13

Section13/1.go

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+/*
+Coding Exercise #1
+
+1. Using the var keyword declare a string called name and initialize it with your name.
+
+2. Using short declaration syntax declare a string called country and assign the country you are living in to the string variable.
+
+3. Print the following string on multiple lines like this:
+
+Your name: `here the value of name variable`
+
+Country: `here the value of country variable`
+
+4. Print out the following strings:
+
+a) He says: "Hello"
+
+b) C:\Users\a.txt
+*/
+
+package main
+
+import "fmt"
+
+func main() {
+	var name string = "Andrei"
+	country := "Romania"
+
+	fmt.Printf("Your name: %s\nCountry: %s\n", name, country)
+
+	//equivalent to:
+	fmt.Printf(`Your name: %s
+Country: %s
+`, name, country)
+
+	fmt.Println("He says: \"Hello\"")
+	fmt.Println("C:\\Users\\a.txt")
+
+}

Section13/2.go

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+/*
+1. Declare a rune called r that stores the non-ascii letter ă
+
+2. Print out the type of r
+
+3. Declare 2 strings that contains the values ma and m
+
+4. Concatenate the strings and the rune in a new string (the new string will hold the value mamă ).
+
+BTW: mamă means mother in Romanian.
+
+Note: You should convert rune to string to contatenate it to another string.
+*/
+
+package main
+
+import "fmt"
+
+func main() {
+	r := 'ă'                     // declaring a rune
+	fmt.Printf("r type:%T\n", r) // rune is alias to int32
+
+	s1, s2 := "ma", "m" // declaring 2 strings
+
+	// concatenating strings
+	s := s1 + s2 + string(r)   // converting rune to string (expliction conversion is required)
+	fmt.Printf("s is %s\n", s) // => s is mamă
+
+}

Section13/3.go

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+/*
+Consider the following string declaration: s1 := "țară means country in Romanian"
+
+1. Iterate over the string and print out byte by byte
+
+2. Iterate  over the string and print out rune by rune and the byte index where the rune starts in the string
+
+Are you stuck? Do you want to see the solution for this exercise?
+*/
+
+package main
+
+import "fmt"
+
+func main() {
+	s1 := "țară means country in Romanian"
+
+	// iterating over the string and print out byte by byte
+	fmt.Printf("Bytes in string: ")
+	for i := 0; i < len(s1); i++ {
+
+		fmt.Printf("%v ", s1[i])
+	}
+
+	fmt.Println()
+
+	// iterating over the string and print out rune by rune
+	// and the byte index where the rune starts in the string
+	for i, r := range s1 {
+		fmt.Printf("byte index: %d -> rune: %c\n", i, r)
+	}
+
+	fmt.Println()
+
+}

Section13/4.go

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+package main
+
+import (
+	"fmt"
+	"unicode/utf8"
+)
+
+func main() {
+	s1 := "Go is cool!"
+
+	x := s1[0]
+	fmt.Println(x)
+
+	// ERROR -> cannot assign to s1[0]
+	// s1[0] = 'x'
+
+	// printing the number of runes in the string
+	// fmt.Println(len(s1))
+	fmt.Println(utf8.RuneCountInString(s1))
+
+}

Section13/5.go

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+/*
+
+Consider the following string declaration:s := "你好 Go!"
+
+1. Convert the string to a byte slice.
+
+2. Print out the byte slice
+
+3. Iterate over the byte slice and print out each index and byte in the byte slice 
+
+*/
+
+package main
+
+import "fmt"
+
+func main() {
+	s := "你好 Go!"
+
+	// converting string to byte slice
+	b := []byte(s)
+
+	// printing out the byte slice
+	fmt.Printf("%#v\n", b)
+
+	// iterating over the byte slice and printing out each index and byte in the byte slice
+	for i, v := range b {
+		fmt.Printf("%d -> %d\n", i, v)
+	}
+
+}

Section13/6.go

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+/*
+
+Consider the following string declaration:s := "你好 Go!"
+
+1. Convert the string to a rune slice.
+
+2. Print out the rune slice
+
+3. Iterate over the rune slice and print out each index and rune in the rune slice 
+
+*/
+
+package main
+
+import "fmt"
+
+func main() {
+	s := "你好 Go!"
+
+	// converting string to rune slice
+	r := []rune(s)
+
+	// printing out the rune slice
+	fmt.Printf("%#v\n", r)
+
+	// iterating over the rune slice and printing out each index and rune in the rune slice
+	for i, v := range r {
+		fmt.Printf("%d -> %c\n", i, v)
+	}
+
+}