题目:http://javaroad.blog.51cto.com/661972/646073
1.将1 到1000 之间的奇数打印出来
package com.guet; //1到1000的奇数打印出来 public class JiShu { public static void main(String[] args) { // TODO Auto-generated method stub int number = 0; int now = 1; for (int i = 1; i <= 1000; i++) { if (now++ % 2 == 1) number++; } System.out.print("1到1000的奇数有"+number+"个"); } }
4-30第二次
public class One {// 将1到1000之间的奇数打印出来 public static void main(String[] args) { // TODO Auto-generated method stub int i; for (i = 1; i < 1001; i++) { if (i % 2 == 1) { System.out.println(i); } } } }
2.判断一个数能否同时被3和5 整除
package com.guet; import java.util.Scanner; //判断一个数能否同时被3和5 整除 public class ZhengChu { public static void main(String[] args) { // TODO Auto-generated method stub int number; System.out.print("输入一个数:"); Scanner numScanner=new Scanner(System.in); number=numScanner.nextInt(); if(number%3==0&&number%5==0) System.out.println(number+"可以 同时被3和5 整除"); else System.out.println(number+"不能同时被3和5 整除"); } }
4-30
import java.util.Scanner; public class Two {// 判断一个数能否同时被3和5整除 public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int x = scanner.nextInt(); if (x % 3 == 0 && x % 5 == 0) { System.out.print("可以同时被3和5整除"); } else { System.out.print("不可以同时被3和5整除"); } } }
3.输入10个数,找出最大一个数,并打印出来。
package com.guet; import java.util.Scanner; //输入10个数,找出最大一个数,并打印出来。 public class Max10 { public static void main(String[] args) { // TODO Auto-generated method stub int number; int temp = 0; Scanner in = new Scanner(System.in); for (int i = 1; i <= 10; i++) { System.out.print("输入第" + i + "个数:"); number = in.nextInt(); if (number > temp) temp = number; } System.out.print("这10个数中最大的是:" + temp); } }
4.给出一百分制成绩,要求输出成绩等级’A’,’B’,’C’,’D’,’E’。90 分以上为’A’,80~89 分为’B’,70~79 分为’C’,60~69 分为’D’,60分以下为’E’
package com.guet; import java.util.Scanner; //给出一百分制成绩,要求输出成绩等级’A’,’B’,’C’,’D’,’E’。 //90 分以上为’A’,80~89 分为’B’,70~79 分为’C’,60~69 分为’D’,60分以下为’E’ public class GradeLevel { public static void main(String[] args) { // TODO Auto-generated method stub int grade ,level; System.out.print("输入你的百分制成绩:"); Scanner inScanner=new Scanner(System.in); grade=inScanner.nextInt(); if(grade>100||grade<0){ System.out.println("你输入的成绩有误"); System.exit(0); } switch (grade%10){ case 10: case 9:level=65;break;//A case 8:level=66;break;//B case 7:level=67;break;//C case 6:level=68;break; default :level=69; } if(grade==100) level=65; System.out.println("你的成绩是"+(char)level); } }
5.把一个正整数分解质因数。!注:此方法存在很大问题,因为我还没想好怎么解决质数递增的问题。当前代码运行后,不会自动停止。
package com.google; import java.util.Scanner; //把一个正整数分解质因数 public class Five { public static void main(String[] args) { // TODO Auto-generated method stub int number , i=2; Scanner numScanner = new Scanner(System.in); System.out.print("输入一个正整数:"); number = numScanner.nextInt(); System.out.print(number+"分解出的质因数有:"); do{ if(number%i==0){ number=number/2; System.out.print(i+" "); }else{ i++; } }while (true); } }
6.打印出菱形
package com.google; //打印出如下图案(菱形) // * // *** // ***** //******* // ***** // *** // * public class Diamond { public static void main(String[] args) { // TODO 自动生成的方法存根 int x, y; for (x = 1; x < 5; x++) { for (y = 1; y < (4 + x); y++) { if (y <= (4 - x))// 原始if(y<=(3+x-(2*x-1))) System.out.print(" "); else System.out.print("*"); } System.out.println(); } for (x = 5; x < 8; x++) { for (y = 1; y < 7; y++) { if ((x - 4) < y && y < (12 - x)) System.out.print("*"); else if(y<=x-4) System.out.print(" "); } System.out.println(); } } }
7.将1至7 的数字转换为星期日到星期六的字符串
package com.google; import java.util.Scanner; //将1至7 的数字转换为星期日到星期六的字符串 //这个题目目前不是很理解 public class SevenDays { public static void main(String[] args) { // TODO 自动生成的方法存根 int x; String xString = new String(); System.out.print("输入1到7其中的一个数字:"); Scanner num = new Scanner(System.in); x = num.nextInt(); switch (x) { case 1: { xString = "星期日"+x; } break; case 2: { xString = "星期一"; xString = Integer.toString(x); } break; case 3: { xString = "星期二"; xString = Integer.toString(x); } break; case 4: { xString = "星期三"; xString = Integer.toString(x); } break; case 5: { xString = "星期四"; xString = Integer.toString(x); } break; case 6: { xString = "星期五"; xString = Integer.toString(x); } break; case 7: { xString = "星期六"; xString = Integer.toString(x); } break; } System.out.print("结果:"+xString); } }
8.有任意三个整数a,b,c,请输出其中最大的
import java.util.Scanner; //有任意三个整数a,b,c,请输出其中最大的 public class Eight { public static void main(String[] args) { // TODO 自动生成的方法存根 int a, b, c; Scanner in = new Scanner(System.in); System.out.print("输入第一个数a:"); a = in.nextInt(); System.out.print("输入第二个数b:"); b = in.nextInt(); System.out.print("输入第三个数c:"); c = in.nextInt(); if (a > b) { if (a > c) { System.out.print("a最大"); } else { System.out.print("c最大"); } } else { if (b > c) { System.out.print("b最大"); } else { System.out.print("c最大"); } } } }
9.将任意三个整数a,b,c按从小到大的顺序输出
import java.util.Scanner; //将任意三个整数a,b,c按从小到大的顺序输出 public class Nine { public static void main(String[] args) { // TODO 自动生成的方法存根 int a, b, c; Scanner in = new Scanner(System.in); System.out.print("输入a:"); a = in.nextInt(); System.out.print("输入b:"); b = in.nextInt(); System.out.print("输入c:"); c = in.nextInt(); if (a == b || a == c || b == c) { System.out.print("你输入的数字中有相等的,程序结束。"); System.exit(0); } if (a > b) { if (a > c) { // ************* a>c ************* if (b > c) { System.out.print("a>b>c"); } else { System.out.print("a>c>b"); } // ************* a>c ************* } else { System.out.print("c>a>b"); } } else { if (b > c) { if (a > c) { System.out.print("b>a>c"); } else { System.out.print("b>c>a"); } } else { System.out.print("c > b > a"); } } } }
10.水仙花数:用程序找出每位数的立方和等于该数本身值的所有的3位数
import java.util.Scanner; //用程序找出每位数的立方和等于该数本身值的所有的3位数 public class Ten { public static void main(String[] args) { // TODO 自动生成的方法存根 Scanner inScanner = new Scanner(System.in); int number, number_cal, a, b, c; // 先 确定该数的位数,可代码实现,为了方便可手动从控制台输入 System.out.print("输入一个三位数数字:"); number_cal = number = inScanner.nextInt(); a = number_cal / 100; number_cal = number_cal - a * 100; b = number_cal / 10; c = number_cal - b * 10; if ((a * a * a + b * b * b + c * c * c) == number) { System.out.print(number + "是水仙花数"); } else { System.out.print(number + "不是水仙花数"); } } }
11.计算1累加到n(n>=2的整数)的和
import java.util.Scanner; //计算1 加到n ( n>=2的整数)的总和 public class Eleven { public static void main(String[] args) { // TODO 自动生成的方法存根 int number, sum = 0; Scanner in = new Scanner(System.in); System.out.print("输入一个>=2的整数:"); number = in.nextInt(); for (int i = 1; i <= number; i++) { sum = sum + i; } System.out.print("结果是" + sum); } }
12.得到一个整数的绝对值
import java.util.Scanner; //得到一个整数的绝对值 public class Twelve { public static void main(String[] args) { // TODO 自动生成的方法存根 int number; Scanner inScanner = new Scanner(System.in); System.out.print("输入一个整数:"); number = inScanner.nextInt(); if (number < 0) { number = 0 - number; } System.out.print("绝对值是:" + number); } }