<span style="font-size:24px;">import java.util.*;
public class a2 {
public static void main(String[] args) {
int young = 0;
int age = 0;
Scanner input = new Scanner(System.in);
for (int i = 0; i < 10; i++) {
System.out.println("请输入第" +(i+1)+ "位顾客的年龄: ");
age = input.nextInt();
if(age > 0 && age <= 30){
young++;
}
}
System.out.println("30岁以下的比例是: " + young/10.0*100 +"%");
System.out.println("30岁以上的比例是: " + (1-young/10.0) *100 +"%");
}
}</span>
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