标签：inf 输入 错误 nbsp ring class 条件语句 code scan
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 a;
import java.util.Scanner;
public class sss {
public static void main(String[] args) {
// TODO Auto-generated method stub
for (int i = 100; i < 1000; i++) {
int a = i / 100;
int b = i / 10 % 10;
int c = i % 10;
if (Math.pow(a, 3) + Math.pow(b, 3) + Math.pow(c, 3) == i)
System.out.println("水仙花数 : " +i);
}
}
}
2.在控制台输出以下图形（知识点：循环语句、条件语句）（ 四个位置经过翻转的直角三角形）
package a;
import java.util.Scanner;
public class sss {
public static void main(String[] args) {
// TODO Auto-generated method stub
for(int a = 1;a <= 6;a++)
{
for(int i = 1;i <= a;i++)
System.out.printf("%d ",i);
System.out.print("\n");
}
System.out.print("\n");
for(int a = 6;a >= 1;a--)
{
for(int i = 1;i <= a;i++)
System.out.printf("%d ",i);
System.out.print("\n");
}
System.out.print("\n");
for(int a = 1;a <= 6;a++)
{
for(int i = 1;i <= 2 * (6 - a);i++)
System.out.print(" ");
for(int i = a;i >= 1;i--)
System.out.printf("%d ",i);
System.out.print("\n");
}
System.out.print("\n");
for(int a = 6;a >= 1;a--)
{
for(int i = 1;i <= 2 *(6-a);i++)
System.out.print(" ");
for(int i = 1;i <= a;i++)
System.out.printf("%d ",i);
System.out.print("\n");
}
}
}
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 a;
import java.util.Scanner;
public class sss {
public static void main(String[] args) {
// TODO Auto-generated method stub
int year, month, day;
int days = 0;
int d = 0;
int e;
input fymd = new input();
do {
e = 0;
System.out.print("输入年");
year =fymd.input();
System.out.print("输入月");
month = fymd.input();
System.out.print("输入天");
day = fymd.input();
if (year < 0 || month < 0 || month > 12 || day < 0 || day > 31) {
System.out.println("输入错误请重新输入");
e=1 ; }
}while( e==1);
for (int i=1; i <month; i++) {
switch (i) {
case 1:
case 3:
case 5:
case 7:
case 8:
case 10:
case 12:
days = 31;
break;
case 4:
case 6:
case 9:
case 11:
days = 30;
break;
case 2:
if ((year % 400 == 0) || (year % 4 == 0 && year % 100 != 0)) {
days = 29;
} else {
days = 28;
}
break;
}
d += days;
}
System.out.println(year + "-" + month + "-" + day + "是这年的第" + (d+day)
+ "天。");
}
}
class input{
public int input() {
int value = 0;
Scanner s = new Scanner(System.in);
value = s.nextInt();
return value;
}
}
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 a;
import java.util.Scanner;
public class sss {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner sc=new Scanner(System.in);
System.out.println("请输入一个四位数");
int n=sc.nextInt();
int a = n / 1000;
int b = n / 100 % 10;
int c = n / 10 % 10;
int d = n % 10;
int s = d * 1000 + c * 100 + b * 10 + a;
System.out.println("反转后数为" + s);
}
}
标签：inf 输入 错误 nbsp ring class 条件语句 code scan
原文地址：https://www.cnblogs.com/y611lx/p/12618555.html
