Java4.2上机作业

package aa;
public class text {
    public static void main(String[] args) {
        int i,ge,shi,bai;
        for(i=100;i<=999;i++){
            ge=i%10;
            shi=i/10%10;
            bai=i/100;
            if(ge*ge*ge+shi*shi*shi+bai*bai*bai==i){
                System.out.println(i);
            }
            }
        
}
}

 

 

package aa;

public class text {
    public static void main(String[] args) {
         for(int i=1;i<=6;i++){
             for(int j=1;j<=i;j++){
                     System.out.print(j);
             } 
                System.out.println();     
         }
}
}

package aa;

public class text {
    public static void main(String[] args) {
         for(int i=1;i<=7;i++){
             for(int j=1;j<=7-i;j++){
                     System.out.print(j);
             } 
                System.out.println();     
         }
}
}

package aa;

public class text {
    public static void main(String[] args) {
        for(int i=1;i<=6;i++){
             for(int j=6;j>0;j--){
            if(j>i){
                System.out.print(" ");
            }else{
                System.out.print(j);
             } 
             }
                System.out.println();     
        }

}    
    }

 
package aa;

public class text {
    public static void main(String[] args) {
        for(int i=6;i>0;i--){
             for(int j=6;j>0;j--){
            if(j>i){
                System.out.print(" ");
            }else{
                System.out.print(j);
             } 
             }
                System.out.println();     
        }

}    
    }

 

 

package aa;
public class mm {

    public static void main(String[] args) {
                int sum = 0;
                System.out.println("请输入年月日");
                Scanner input=new Scanner(System.in);
                int a=input.nextInt();
                int b=input.nextInt();
                int c=input.nextInt();
                    switch(b-1){
                    case 11: sum+=31;
                    case 10: sum+=30;
                    case 9:  sum+=31;
                    case 8:  sum+=30;
                    case 7:  sum+=31;
                    case 6:  sum+=31;
                    case 5:  sum+=30;
                    case 4:  sum+=31;
                    case 3:  sum+=30;
                    case 2:  sum+=31;
                    case 1:  sum+=28;
                    case 0:  sum+=c;
                    }
                    if(b>2){
                    if(a%4==0||a%100!=0&&a%400==0){
                        sum++;
                    }
                    }
                    System.out.println("第"+sum+"天");
        }    
        

    }

 

 

package aa;
import java.util.Scanner;
public class mm {

    public static void main(String[] args) {
                System.out.println("请输入一个四位数");
                Scanner input=new Scanner(System.in);
                int a=input.nextInt();
                int ge,shi,bai,qian,c,b,n;
                ge=a%10;
                bai=a/100%10;
                shi=a/10%10;
                qian=a/1000;
                c=qian;
                qian=ge;
                ge=c;
                b=shi;
                shi=bai;
                bai=b;    
                n=ge+shi*10+bai*100+qian*1000;
                System.out.println("交换后是"+n);
        }    
        

    }