与 while 循环在循环顶部测试循环条件不同， do-while 循环在循环底部检查其条件， do-while 循环与while循环相似，除了保证do-while循环至少执行一次
do-while - 语法
以下是do-while循环的语法。
do { statement(s); } while( condition );
do-while - 流程图
尝试使用以下示例程序来了解Scala编程语言中的循环控制语句(while语句)。
do-while - 示例
object Demo {
def main(args: Array[String]) {
//局部变量声明：
var a=10;
</span><span class="com">//do循环执行</span><span class="pln">
</span><span class="kwd">do</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
println</span><span class="pun">(</span><span class="pln"> </span><span class="str">"Value of a: "</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> a </span><span class="pun">);</span><span class="pln">
a</span><span class="pun">=</span><span class="pln">a </span><span class="pun">+</span><span class="pln"> </span><span class="lit">1</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span><span class="kwd">while</span><span class="pun">(</span><span class="pln"> a </span><span class="pun"><</span><span class="pln"> </span><span class="lit">20</span><span class="pln"> </span><span class="pun">)</span><span class="pln">
}
}
将上述程序保存在 Demo.scala 中。以下命令用于编译和执行该程序。
\>scalac Demo.scala \>scala Demo
value of a: 10 value of a: 11 value of a: 12 value of a: 13 value of a: 14 value of a: 15 value of a: 16 value of a: 17 value of a: 18 value of a: 19
