public class Main{
// 主方法
public static void main
(String[] args
) { int range = 9;
// 调用方法
multiple_num(21);
}
// 方法:打印3的倍数
public static void multiple_num(int num) {
for (int i = 0; i <= num; i++) {
if (i % 3 == 0) {
}
}
}
}
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