4.2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 fda; import java.util.Scanner; public class gfsdx { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); int a,b,c,d; for(int i=100;i<=999;i++){ a=i%10; b=i%100/10; c=i/100; d=a*a*a+b*b*b+c*c*c; if(d==i){ 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 das; import java.util.Scanner; public class yhiutg { 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(); } } } package das; import java.util.Scanner; public class yhiutg { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); for(int i=6;i>=0;i--){ for(int j=1;j<=i;j++){ System.out.print(j); } System.out.println(); } } } package das; import java.util.Scanner; public class yhiutg { public static void main(String[] args) { // TODO Auto-generated method stub for(int i=1;i<=6;i++){ for(int n=0;n<6-i;n++){ System.out.print(" "); } for(int j=i;j>=1;j--){ System.out.print(j); } System.out.println(); } } } package das; import java.util.Scanner; public class yhiutg { public static void main(String[] args) { // TODO Auto-generated method stub for(int i=6;i>=0;i--){ for(int n=0;n<6-i;n++){ System.out.print(" "); } for(int j=1;j<=i;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 das; import java.util.Scanner; public class yhiutg { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input = new Scanner(System.in); System.out.println("输入年:"); int year = input.nextInt(); System.out.println("输入月:"); int month = input.nextInt(); System.out.println("输入日:"); int day = input.nextInt(); int total=0;//统计输入月份之前一共多少天 for (int i = 1; i < month; i++){ switch(i){ case 4: case 6: case 9: case 11: total +=30; break; case 2: if (year%4==0&&year%100!=0||year%400==0){ total +=29; }else{ total +=28; }break; default: total +=31; break; } } total+=day; System.out.println("该天是"+total+"天"); } }
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 das; import java.util.Scanner; public class yhiutg { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入一个四位数"); int x=input.nextInt(); int a,b,c,d; a=x%10; b=x/10%10; c=x/100%10; d=x/1000; System.out.println("反转后的四位数是"+a+b+c+d); } }