数组和切片完成

Author: Tinywan

Diff for: demo/array-001.go

@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+func main() {
+	arr := [...]float64{23.2,34.12,45.22,55.6}
+	fmt.Println("length of a is  ",len(arr)); // print 4
+
+	for i := 0; i < len(arr); i++ { //looping from 0 to the length of the array
+        fmt.Printf("%d th element of a is %.2f\n", i, arr[i])
+	}
+	
+	sum := float64(0);
+	for i,v := range arr {
+		fmt.Printf("%d the element of a is %.2f\n ",i,v);
+		sum += v
+	}
+	fmt.Println("\n of all element of a ",sum);
+}

Diff for: demo/array-002.go

@@ -0,0 +1,32 @@
+package main
+
+import (  
+    "fmt"
+)
+
+func printarray(a [3][2]string) {  
+    for _, v1 := range a {
+        for _, v2 := range v1 {
+            fmt.Printf("%s ", v2)
+        }
+        fmt.Printf("\n")
+    }
+}
+
+func main() {  
+    a := [3][2]string{
+        {"lion", "tiger"},
+        {"cat", "dog"},
+        {"pigeon", "peacock"}, //this comma is necessary. The compiler will complain if you omit this comma
+    }
+    printarray(a)
+    var b [3][2]string
+    b[0][0] = "apple"
+    b[0][1] = "samsung"
+    b[1][0] = "microsoft"
+    b[1][1] = "google"
+    b[2][0] = "AT&T"
+    b[2][1] = "T-Mobile"
+    fmt.Printf("\n")
+    printarray(b)
+}

Diff for: demo/slice-001.go

@@ -0,0 +1,38 @@
+package main
+
+import (  
+    "fmt"
+)
+
+func main() {  
+	arr := [5]int{23,44,55,66,77}
+	var b []int = arr[1:4]
+	fmt.Println(b)
+	c :=[]int{7,8,9,99,12}
+	fmt.Println(c)
+
+    darr := [...]int{57, 89, 90, 82, 100, 78, 67, 69, 59}
+    dslice := darr[2:5]
+    fmt.Println("array before",darr)
+    for i := range dslice {
+        dslice[i]++
+    }
+	fmt.Println("array after ",darr) 
+	
+	fruitarray := [...]string{"apple", "orange", "grape", "mango", "water melon", "pine apple", "chikoo"}
+    fruitslice := fruitarray[1:3]
+	fmt.Printf("length of slice %d capacity %d \n", len(fruitslice), cap(fruitslice)) //length of is 2 and capacity is 6
+	
+	var names []string //zero value of a slice is nil
+    if names == nil {
+        fmt.Println("slice is nil going to append")
+        names = append(names, "John", "Sebastian", "Vinay")
+        fmt.Println("names contents:",names)
+	}
+	
+	sl1 := []string{"apple","orange","tag"}
+	sl2 := []string{"fruit","person"}
+
+	sl3 := append(sl1,sl2...);
+	fmt.Println("sl3 : ",sl3)
+}