while语句注意事项。 有疑惑。
3、循环体如果包括有一个以上的语句，则必须用{}括起来，组成复合语句。
什么意思呢？理解不能呀。尤其是“有一个以上的语句”不太懂。
4 回答
while语句本身的格式是： while (控制表达式) 语句 // 所谓的循环体就是后面这个语句，只是一条语句。
如果你想让while循环体执行多个语句的话，就用大括号将多条语句括起来，这就形成了“复合语句”，复合语句在逻辑上视为“一条”语句。
所以说：
// 如果这样写：
while (xx) {
a;
b;
c; // a b c这三条语句作为复合语句的一部分都会在while循环中执行
}
// 可要是这样写：
while (xx)
a; // 只有a语句是紧跟在while后面的，a后面的分号结束了整个while语句，所以只有a会在while循环时执行
b;
c; // b 和 c 语句与while循环无关
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