1 package ddd;
2
3 import java.util.Scanner;
4
5 public class aaa {
6 public static void main(String[] args){
7 double m;
8 Scanner R=new Scanner(System.in);
9 int r;
10 r=R.nextInt();
11 m=r*r*3.14;
12 System.out.println("面积为："+m);
13
14 }
15
16 }
1 package ddd;
2
3 public class ccc {
4 public static void main(String[] args){
5 int a=5;
6 if(a%2==1){
7 System.out.println("奇数");
8 }else{
9 System.out.println("偶数"); }
10 }
11
12 }
package ddd;
import java.util.Scanner;
public class fff {
public static void main(String[] args){
System.out.println("请输入你要加密的数字：");
Scanner in = new Scanner(System.in);
int s;
s = in.nextInt();
double S;
S=(s*10+5) / 2 + 3.14159;
int x=(int)S;
System.out.println("密码为："+x);
}
}
