第五次上机作业
1. 打印出所有的"水仙花数",所谓"水仙花数"是指一个三位数,其各位数字立方和等于该数本身。例如:153是一个"水仙花数",因为153=1的三次方+5的三次方+3的三次方。(知识点:循环语句、条件语句)
package qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); int ge,shi,bai; for(int i=100;i<1000;i++){ ge=i%10; shi=i/10%10; bai=i/100; if(i==ge*ge*ge+shi*shi*shi+bai*bai*bai){ System.out.println(i); } } } }
2.
在控制台输出以下图形(知识点:循环语句、条件语句)
package qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); int ge,shi,bai; for(int i=100;i<1000;i++){ ge=i%10; shi=i/10%10; bai=i/100; if(i==ge*ge*ge+shi*shi*shi+bai*bai*bai){ System.out.println(i); } } } } package qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); for(int i=1;i<=6;i++){ for(int j=1;j<i;j++){ System.out.print(j); } System.out.println(i); } } } package qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); for(int i=1;i<=6;i++){ for(int j=1;j<=7-i;j++){ System.out.print(j); } System.out.println(); } } } package qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub for(int i = 1; i <= 6; i++) { for(int j = i; j >= 1; j--) { System.out.print(j); } System.out.println(); } } } package qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub for(int n=6;n>=0;n--) { for(int j=1;j<=n;j++) { System.out.print(j); } System.out.println(); } } }
3. 输入年月日,判断这是这一年中的第几天(知识点:循环语句、条件语句)
package qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); int a=input.nextInt(); int b=input.nextInt(); int c=input.nextInt(); int x=0; if(a%4==0 &&a%100!=0 ||a%400==0) { switch(b) { case 1: x=31+c; break; case 2: x=31+29+c;break; case 3: x=31+29+31+c;break; case 4: x=31+29+31+30+c;break; case 5: x=31+29+31+30+31+c;break; case 6: x=31+29+31+30+31+30+c;break; case 7: x=31+29+31+30+31+30+31+c;break; case 8: x=31+29+31+30+31+30+31+31+c;break; case 9: x=31+29+31+30+31+30+31+31+30+c;break; case 10: x=31+29+31+30+31+30+31+31+30+31+c;break; case 11: x=31+29+31+30+31+30+31+31+30+31+30+c;break; case 12: x=31+29+31+30+31+30+31+31+30+31+30+31+c;break; } }else { switch(b) { case 1: x=31+c;break; case 2: x=31+28+c;break; case 3: x=31+28+31+c;break; case 4: x=31+28+31+30+c;break; case 5: x=31+28+31+30+31+c;break; case 6: x=31+28+31+30+31+30+c;break; case 7: x=31+28+31+30+31+30+31+c;break; case 8: x=31+28+31+30+31+30+31+31+c;break; case 9: x=31+28+31+30+31+30+31+31+30+c;break; case 10: x=31+28+31+30+31+30+31+31+30+31+c;break; case 11: x=31+28+31+30+31+30+31+31+30+31+30+c;break; case 12: x=31+28+31+30+31+30+31+31+30+31+30+31+c;break; } } System.out.println(x); } }
4.由控制台输入一个4位整数,求将该数反转以后的数,如原数为1234,反转后的数位4321(知识点:循环语句、条件语句)
package qq; import java.util.Scanner; public class Cc { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("请输入一个四位数"); int x=input.nextInt(); int a=x%10; int b=x/10%10; int c=x/100%10; int d=x/1000; System.out.println("变换后的数为:"+a+b+c+d); } }