add grammer

.gitignore

@@ -0,0 +1,2 @@
+#idea
+.idea/*

MyGragmmar/myfmt.go

@@ -0,0 +1,51 @@
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Printf("%x\n", 456)
+	var m *int
+	fmt.Printf("%s\n", m)
+	//a := 10
+	b := 10
+	m = &b
+	fmt.Printf("%d\n", *m)
+
+	str := []string{"foo", "gomain"}
+	for i,s := range str{
+		fmt.Println(i, s)
+	}
+
+	// array
+	arr := [5] int{1:9, 4:1}
+	fmt.Println(arr)
+
+	// arrayx2
+	var value [][]int
+	arr1 := []int{1, 2, 3}
+	arr2 := []int{4, 5, 6}
+	value = append(value, arr1)
+	value = append(value, arr2)
+	fmt.Println(value[0])
+	for i:=0; i<2; i++{
+		for j:=0; j<3; j++{
+			fmt.Print(value[i][j])
+		}
+	}
+
+	var  ptr *int
+
+	fmt.Printf("\nptr 的值为 : %x\n", ptr  )
+
+	f1, f2 := 10, 20
+	fmt.Println(f1, f2)
+	swap(&f1, &f2)
+	fmt.Println(f1, f2)
+}
+
+func swap(a, b *int){
+	temp := *a
+	fmt.Println(*a)
+	*a = *b
+	*b = temp
+}

MyGragmmar/myslice.go

@@ -0,0 +1,48 @@
+package main
+
+import "fmt"
+
+/**
+定义切片
+var slice1 []type = make([]type, len)
+slice1 := make([]type, len)
+指定容量,capacity
+make([]T, length, capacity)
+*/
+
+func main() {
+	s := []int{1, 2, 3, 4}
+	s1 := make([]int, 2, 3)
+	fmt.Println(s)
+	fmt.Println(len(s1), cap(s1), s1)
+	fmt.Println(len(s), cap(s), s)
+	s2 := s[:3]
+	fmt.Println(s2)
+
+
+	var numbers []int
+	printSlice(numbers)
+
+	/* 允许追加空切片 */
+	numbers = append(numbers, 0)
+	printSlice(numbers)
+
+	/* 向切片添加一个元素 */
+	numbers = append(numbers, 1)
+	printSlice(numbers)
+
+	/* 同时添加多个元素 */
+	numbers = append(numbers, 2,3,4)
+	printSlice(numbers)
+
+	/* 创建切片 numbers1 是之前切片的两倍容量*/
+	numbers1 := make([]int, len(numbers), (cap(numbers))*2)
+
+	/* 拷贝 numbers 的内容到 numbers1 */
+	copy(numbers1,numbers)
+	printSlice(numbers1)
+}
+
+func printSlice(x []int){
+	fmt.Printf("len=%d cap=%d slice=%v\n",len(x),cap(x),x)
+}

MyGragmmar/mystruct.go

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+package main
+
+import "fmt"
+
+type Books struct {
+	title string
+	author string
+	subject string
+	id int
+}
+
+func main() {
+	fmt.Println(Books{"test1", "testname", "testsub", 1})
+	var book1 Books
+	book1.id = 2
+	book1.title = "test2"
+	book1.author = "testname2"
+	fmt.Println(book1)
+}