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  • Go语言学习笔记(六)

    12.流程控制语句

    a.if else语句块
    基本语法:

      1: if condition {
    
      2: 	// do something
    
      3: }
      1: if condition {
    
      2: 	// do something	
    
      3: }else if condition {
    
      4: 	// do something
    
      5: }else {
    
      6: 	// do something
    
      7: }
      1: if statement; condition {
    
      2: 	// do something
    
      3: }

    b.for语句
    Go语言只有一种循环:

      1: for initialisation; condition; post {
    
      2: }

    break终止循环
    continue终止本次循环

    其他几种写法例:

      1: func main() {
    
      2: 	i:=0
    
      3: 	for ;i<=10;{
    
      4: 		fmt.Printf("%d
    ", i)
    
      5: 		i += 2
    
      6: 	}
    
      7: }
    
      8: func main() {
    
      9: 	i:=0
    
     10: 	for i<=10 {
    
     11: 		fmt.Printf("%d
    ", i)
    
     12: 		i += 2
    
     13: 	}
    
     14: }
    
     15: func main() {
    
     16: 	for no,i := 10;i<=10&&no<=19;i,no=i+1,no+1 {
    
     17: 		fmt.Printf("%d*%d=%d
    ",no,i,no*i)
    
     18: 	}
    
     19: }

    c.switch语句

      1: func main() {
    
      2: 	finger := 4
    
      3: 	switch finger {
    
      4: 	case 1:
    
      5: 		fmt.Println("Thumb")
    
      6: 	case 2:
    
      7: 		fmt.Println("Index")
    
      8: 	case 3:
    
      9: 		fmt.Println("Middle")
    
     10: 	case 4:
    
     11: 		fmt.Println("Ring")
    
     12: 	case 5:
    
     13: 		fmt.Println("Pinky")
    
     14: 	}
    
     15: }

    case语句另一种写法

      1: func main() {
    
      2: 	letter:="i"
    
      3: 	switch letter {
    
      4: 	case "a","e","e","o","u"
    
      5: 		fmt.Println("vowel")
    
      6: 	default:
    
      7: 		fmt.Println("not a vowel")
    
      8: 	}
    
      9: }

    switch default
    如果所有case条件不满足,那么就会执行default语句

      1: func main() {
    
      2: 	// 变量finger的生命周期在switch内
    
      3: 	switch finger:=2;finger {
    
      4: 	case 1:
    
      5: 		fmt.Println("Thumb")
    
      6: 	case 2:
    
      7: 		fmt.Println("Index")
    
      8: 	case 3:
    
      9: 		fmt.Println("Middle")
    
     10: 	case 4:
    
     11: 		fmt.Println("Ring")
    
     12: 	case 5:
    
     13: 		fmt.Println("Pinky")
    
     14: 	default:
    
     15: 		fmt.Printf("invaild a=%d
    ", finger)
    
     16: 	}
    
     17: }

    switch case条件判断

      1: func main() {
    
      2: 	num:=75
    
      3: 	switch {
    
      4: 	case num >= 0&& num <=50:
    
      5: 		fmt.Println("省略...")
    
      6: 	case num >= 51 && num <= 100:
    
      7: 		fmt.Println("...")
    
      8: 	case num >= 101:
    
      9: 		fmt.Println("...")
    
     10: 	}
    
     11: }

    switch fallthrough执行并穿透到下一个case语句

      1: func main() {
    
      2: 	switch num:= 101;{
    
      3: 	case num<50:
    
      4: 		fmt.Printf("<50")
    
      5: 		fallthrough
    
      6: 	case num<100:
    
      7: 		fmt.Printf("<100")
    
      8: 		fallthrough
    
      9: 	case num<200:
    
     10: 		fmt.Printf("<200")
    
     11: 	}
    
     12: }

    乘法表练习:

      1: func MultiTable() {
    
      2: 	for i:=1;i<10;i++ {
    
      3: 		for j:=1;j<=i;j++ {
    
      4: 			fmt.Printf(" %d * %d = %d	", j, i, j*i)
    
      5: 		}
    
      6: 		fmt.Println()
    
      7: 	}
    
      8: }
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  • 原文地址:https://www.cnblogs.com/haoqirui/p/10100603.html
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