const

Author: N0FreeLunch

05_bool/01-bool.go

@@ -0,0 +1,11 @@
+package main
+
+import "fmt"
+
+func main () {
+  var b1 bool = true;
+  var b2 bool = false;
+  
+  fmt.Println(b1)
+  fmt.Println(b2)
+}

05_bool/02-boolOperation.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func main () {
+  fmt.Println(true && true) // true
+  fmt.Println(true && false) // false
+  fmt.Println(false && false) // false
+  fmt.Println(true || true) // true
+  fmt.Println(true || false) // true
+  fmt.Println(false || false) // false
+  fmt.Println(!true) // false
+  fmt.Println(!false) // true
+}

05_bool/03-compare.go

@@ -0,0 +1,14 @@
+package main
+
+import "fmt"
+
+func main () {
+  var num1 int = 3
+  var num2 int = 10
+
+  fmt.Println(num1 > num2) // false
+  fmt.Println(num1 < num2) // true
+  fmt.Println(num1 != num2) // true
+  fmt.Println(num1 >= num2) // false
+  fmt.Println(num1 <= num2) // true
+}

06-const/01-const.go

@@ -0,0 +1,17 @@
+package main
+
+import "fmt"
+
+func main () {
+  const age int = 10
+  const name string = "Maria"
+  const score int
+
+  age = 20
+  name = "Grace"
+
+  fmt.Println(age)
+  fmt.Println(name)
+  fmt.Println(score)
+
+}

06-const/02-constSubstitution.go

@@ -0,0 +1,9 @@
+package main
+
+import "fmt"
+
+func main() {
+  const age = 10
+  const name = "Maria"
+  const address
+}

06-const/03-multiDefine.go

@@ -0,0 +1,13 @@
+package main
+
+import "fmt"
+
+const x, y int = 20, 50
+const age, name = 10, "Maria"
+
+func main () {
+  fmt.Println(x)
+  fmt.Println(y)
+  fmt.Println(age)
+  fmt.Println(name)
+}

06-const/04-parenthesesConst.go

@@ -0,0 +1,15 @@
+package main
+
+import "fmt"
+
+func main () {
+  const (
+    x, y int = 30, 50
+    age, name = 10, "Maria"
+  )
+
+  fmt.Println(x)
+  fmt.Println(y)
+  fmt.Println(age)
+  fmt.Println(name)
+}

06-const/05-week.go

@@ -0,0 +1,23 @@
+package main
+
+import "fmt"
+
+const Sunday = 0
+const Monday = 1
+const Tuesday = 2
+const Wednesday = 3
+const Thursday = 4
+const Friday = 5
+const Saturday = 6
+const numberOfDays = 7
+
+func main () {
+  fmt.Println(Sunday)
+  fmt.Println(Monday)
+  fmt.Println(Tuesday)
+  fmt.Println(Wednesday)
+  fmt.Println(Thursday)
+  fmt.Println(Friday)
+  fmt.Println(Saturday)
+  fmt.Println(numberOfDays)
+}

06-const/06-enumConst.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+const (
+  Sunday = 0
+  Monday = 1
+  Tuesday = 2
+  Wednesday = 3
+  Thursday = 4
+  Friday = 5
+  Saturday = 6
+  numberOfDays = 7
+)
+
+func main () {
+  fmt.Println(Sunday)
+  fmt.Println(Monday)
+  fmt.Println(Tuesday)
+  fmt.Println(Wednesday)
+  fmt.Println(Thursday)
+  fmt.Println(Friday)
+  fmt.Println(Saturday)
+  fmt.Println(numberOfDays)
+}

06-const/07-iota.go

@@ -0,0 +1,25 @@
+package main
+
+import "fmt"
+
+const (
+  Sunday = iota
+  Monday
+  Tuesday
+  Wednesday
+  Thursday
+  Friday
+  Saturday
+  numberOfDays
+)
+
+func main () {
+  fmt.Println(Sunday)
+  fmt.Println(Monday)
+  fmt.Println(Tuesday)
+  fmt.Println(Wednesday)
+  fmt.Println(Thursday)
+  fmt.Println(Friday)
+  fmt.Println(Saturday)
+  fmt.Println(numberOfDays)
+}

06-const/08-shiftOperation.go

@@ -0,0 +1,28 @@
+package main
+
+import "fmt"
+
+const (
+  a = 1 << iota
+  b = 1 << iota
+  c = 1 << iota
+  d = 1 << iota
+)
+
+const (
+  aa = iota * 30
+  bb = iota * 30
+  cc = iota * 30
+  dd = iota * 30
+)
+
+func main () {
+  fmt.Println(a)
+  fmt.Println(b)
+  fmt.Println(c)
+  fmt.Println(d)
+  fmt.Println(aa)
+  fmt.Println(bb)
+  fmt.Println(cc)
+  fmt.Println(dd)
+}

06-const/09-iotaMultibinding.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+const (
+    bit0, mask0 = 1 << iota, 1 << iota - 1
+    bit1, mask1
+    _, _
+    bit3, mask3
+)
+
+func main () {
+  fmt.Println(bit0)
+  fmt.Println(bit1)
+  fmt.Println(bit3)
+  fmt.Println(mask0)
+  fmt.Println(mask1)
+  fmt.Println(mask3)
+}

09-operator/01-.go

@@ -0,0 +1,55 @@
+package main
+
+import "fmt"
+
+func main () {
+  binding()
+  line()
+  defineVariable()
+  line()
+  subtraction()
+  line()
+  line()
+  line()
+  line()
+  line()
+  line()
+  line()
+  line()
+}
+
+func line () {
+  fmt.Println("------")
+}
+
+func binding () {
+  a := 1
+  b := 2
+  var c int = b
+  const d string = "Hello, world"
+
+  fmt.Println(a)
+  fmt.Println(b)
+  fmt.Println(c)
+  fmt.Println(d)
+}
+
+func defineVariable () {
+  a := 1
+  b := 3.5
+  c := "Hello, world"
+  fmt.Println(a)
+  fmt.Println(b)
+  fmt.Println(c)
+}
+
+func subtraction() {
+  a := 3 - 2
+  b := 4 - 5
+  c := a - b
+  d := "Hello, " + "World!"
+  fmt.Println(a)
+  fmt.Println(b)
+  fmt.Println(c)
+  fmt.Println(d)
+}

README.md

@@ -0,0 +1,24 @@
+
+## install go lang on ubuntu 20.04
+
+### dowonload and unzip go lang
+```
+sudo apt install golang-go
+sudo apt install gccgo-go
+```
+
+
+### open ~/.profile file
+```
+vi $HOME/.profile
+```
+
+### write at ~/.profile file
+```
+export PATH=$PATH:/usr/local/go/bin
+```
+
+###
+```
+source ~/.profile
+```