<Go - 巢狀迴圈>

Go 程式語言允許在一個迴圈內部使用另一個迴圈。以下部分會展示幾個示例來說明該概念 −

<語法>

<巢狀迴圈>Go 中語句的語法如下 −

for [condition |  ( init; condition; increment ) | Range] {
   for [condition |  ( init; condition; increment ) | Range] {
      statement(s);
   }
   statement(s);
}

<示例>

以下程式使用巢狀迴圈來查詢 2 到 100 之間的素數 −

package main

import "fmt"

func main() {
   /* local variable definition */
   var i, j int

   for i = 2; i < 100; i++ {
      for j = 2; j <= (i/j); j++ {
         if(i%j==0) {
            break; // if factor found, not prime
         }
      }
      if(j > (i/j)) {
         fmt.Printf("%d is prime\n", i);
      }
   }  
}

當編譯並執行上述程式碼時，會生成以下結果 −

2 is prime
3 is prime
5 is prime
7 is prime
11 is prime
13 is prime
17 is prime
19 is prime
23 is prime
29 is prime
31 is prime
37 is prime
41 is prime
43 is prime
47 is prime
53 is prime
59 is prime
61 is prime
67 is prime
71 is prime
73 is prime
79 is prime
83 is prime
89 is prime
97 is prime