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D编程 nested loops

2021-09-01 11:11 更新

D编程语言允许在一个循环中嵌套另一个循环。

nested loops - 语法

嵌套FOR LOOP语句的语法如下所示:-

for ( init; condition; increment ) {
   for ( init; condition; increment ) {
      statement(s);
   }
   statement(s);
}

嵌套WHILE LOOP语句的语法如下所示:-

while(condition) {
   while(condition) {
      statement(s);
   }
   statement(s);
}

嵌套DO.WHILE LOOP语句的语法如下所示:-

do {
   statement(s);
   do {
      statement(s);
   }while( condition );

}while( condition );

关于循环嵌套的最后一个注意事项是，您可以将任何类型的循环放在任何其他类型的循环中，例如，for循环可以在while循环中，反之亦然。

nested loops - 示例

下面的程序使用嵌套的FOR循环来查找从2到100-的素数

import std.stdio; int main () { /* local variable definition */ int i, j; for(i=2; i<100; i++) { for(j=2; j <= (i/j); j++) if(!(i%j)) break; //if factor found, not prime if(j > (i/j)) writefln("%d is prime", i); } return 0; }
编译并执行上述代码时，将生成以下结果-
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

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