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 text; public class tx { public static void main(String[] args) { // TODO Auto-generated method stub int i,a,b,c; for(i=100;i<1000;i++){ a=i/100; b=i/10%10; c=i%10; if(a*a*a+b*b*b+c*c*c==i){ System.out.println("水仙花数为"+i); } } } }
2.在控制台输出以下图形(知识点:循环语句、条件语句)
package text; public class tx { public static void main(String[] args) { // TODO Auto-generated method stub int i,j; for(i=1;i<=6;i++){ for(j=1;j<=i;j++){ System.out.print(j); } System.out.println(); } } }
package text; public class tx { public static void main(String[] args) { // TODO Auto-generated method stub int i,j; for(i=1;i<=6;i++){ for(j=1;j<=7-i;j++){ System.out.print(j); } System.out.println(); } } }
package text; public class tx { public static void main(String[] args) { // TODO Auto-generated method stub int i,j; for(i=1;i<=6;i++){ for(int k=1;k<=6-i;k++){ System.out.print(" "); } for(j=i;j>0;j--){ System.out.print(j); } System.out.println(); } } }
package text; public class tx { 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 text; import java.util.Scanner; public class tx { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("year"); int year=input.nextInt(); System.out.println("month"); int month=input.nextInt(); System.out.println("day"); int day=input.nextInt(); int total=0; 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("该天是第"+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 text; import java.util.Scanner; public class tx { public static void main(String[] args) { // TODO Auto-generated method stub Scanner input=new Scanner(System.in); System.out.println("输入一个4位整数"); int x=input.nextInt(); int g,s,b,q,sum; if(x>999&&x<10000){ g=x%10; s=x%100/10; b=x%1000/100; q=x/1000; sum=q+b*10+s*100+g*1000; System.out.println(sum); } } }