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)
while:
package number5; public class zzz { public static void main(String[] args) { // TODO Auto-generated method stub int i=100,ge,shi,bai; while(i<=999){ 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); i++; } } }
2.在控制台输出以下图形(知识点:循环语句、条件语句)
package number5; public class zzz { public static void main(String[] args) { // TODO Auto-generated method stub for(int i=1;i<7;i++) { for(int j=1;j<=i;j++) { System.out.print(j); } System.out.println(); } } }
package number5; public class zzz { public static void main(String[] args) { // TODO Auto-generated method stub for(int i=1;i<7;i++) { for(int j=1;j<=7-i;j++) { System.out.print(j); } System.out.println(); } } }
package number5; public class zzz { public static void main(String[] args) { // TODO Auto-generated method stub for(int i=1;i<7;i++) { for(int j=i;j>0;j--) { System.out.print(j); } System.out.println(); } } }
package number5; public class zzz { public static void main(String[] args) { // TODO Auto-generated method stub for(int i=6;i>0;i--) { for(int k=0;k<6-i;k++) { 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 number5; import java.util.Scanner; public class zzz { 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 number5; import java.util.Scanner; public class zzz { public static void main(String[] args) { // TODO Auto-generated method stub} Scanner input = new Scanner(System.in); System.out.println("输入四位整数:"); int i=input.nextInt(); int ge, shi, bai, qian; ge = i / 1000; shi = i % 1000 / 100; bai = i%1000%100/10; qian = i % 1000%100%10; System.out.println("反转后:"+(ge + shi * 10 + bai * 100 + qian*1000)); } }