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