第一次实训

package bbb;
import java.util.Scanner;
public class Odd
{
public static void main(String[] args)
{
Scanner scanner=new Scanner(System.in);
int x;
x=scanner.nextInt();
if(x%2==0)
{
System.out.println("这个数是偶数");
}
else
{
System.out.println("这个数是奇数");
}

scanner.close();
}

}

package bbb;
import java.util.Scanner;
public class work2
{
final static double PI=3.14159;
public static void main(String[] args)
{
Scanner scanner=new Scanner(System.in);
int r;
double s=0;
System.out.println("请输入半径：");
r=scanner.nextInt();

s=PIrr;
System.out.println("面积为："+s);
scanner.close();

}
}
package bbb；
import java .util.Scanner;
public static void main(String[]args){
int x;
System.out.println("请输入加密数");
Scanner scanner=new
scanner.nextInt();
System.out.println("加密结果为:"+((x*10+5)/2)+3.14159);
}

package bbb;
public class Work4 {

public static void main(String[] args) {
for(int i = 0; i<=20; i++)
{
for(int j = 0; j<=33; j++)
{
for(int k = 0; k<=300; k=k+3)
{
if(i5+j3+k/3 == 100&& i+j+k == 100)
{
System.out.println("公鸡:"+i);
System.out.println("母鸡:"+j);
System.out.println("公鸡:"+k);
}
}
}
}
package bbb;
public class work5 {
public static void main(String[] args) {
for(int x=1;x<5;x++)
for(int y=1;y<5;y++)
for(int z=1;z<5;z++)
for(int m=1;m<5;m++)
if(x != y && x != z && x != m && y != z && y != m && z != m)
System.out.println("该数为"+(1000x+100y+10*z+m));
}

}

package bbb;
import java.util.Scanner;
public class work6 {

public static void main(String[] args) {
System.out.println("请输入一位数：");
Scanner sc = new Scanner(System.in);
int num = Integer.parseInt(sc.nextLine());
for(int i=num-1;i<num;i--)
{if(num%i0 || num0)
System.out.println("该数是不是素数");
else
System.out.println("该数是素数");
break;
}
}

}