JAVA程序设计(04.3)-----1.寻找完美数 10000以内 2.编程找出谁是小偷 3.21根火柴……

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1.寻找完美数

完全数（Perfect number），又称完美数或完备数，是一些特殊的自然数。它所有的真因子（即除了自身以外的约数）的和（即因子函数），恰好等于它本身。显然，1不是了

<span style="font-family:Microsoft YaHei;"><strong>package com.lovo;/** * 寻找10000以内的完美数 * @author Abe * */public class Homework3 {public static void main(String[] args) {for (int i =  1 , full = 0 ; i <= 10000 ; i ++ ,full = 0){for (int j = 1 ; j < i ; j ++){if (i % j == 0 ){full += j;}}if (full == i){System.out.printf("%d是完美数\n", i);}}}}</strong></span>

2.寻找小偷

ABCD4人只有一个是小偷，而且每个人说的要么全是真话要么全是假话：A说B不是D是，B说我不是C是，C说A不是B是，D说我不是。谁是小偷额？

<strong>package com.lovo;/** * 找出小偷 find thief * @author Abe * */public class Homework4 {public static void main(String[] args) {int a = 0, b = 0 , c = 0 , d = 0 ;String thief = " ";if((a = 1) == 1 && (b + d == 1) && (b + c ==1) && (a + b == 1)) {thief = "A";}else if((a = 0) == 0 && (b = 1) ==1 && (b + d == 1) && (b + c ==1) && (a + b == 1) ){thief = "B";}else if((b = 0) == 0 && (c = 1) ==1 && (b + d == 1) && (b + c ==1) && (a + b == 1) ){thief = "C";}else if((c = 0) == 0 && (d = 1) ==1 && (b + d == 1) && (b + c ==1) && (a + b == 1) ){thief = "D";}else{System.out.println(" 到底谁才是小偷啊……");}System.out.println("真相只有一个," + thief + "才是真真的小偷！！！");}}</strong>

3.21根火柴的游戏，桌上有21根火柴，2人轮流拿1~4根，人先拿，谁拿到最后一根，谁就输了。要求电脑必胜。

<strong>package com.lovo;import java.util.Scanner;/** * 21根火柴游戏 * @author Abe * */public class Homework5 {public static void main(String[] args) {Scanner sc = new Scanner(System.in);int all = 21;System.out.printf("桌上有%d根火柴,请问你要拿几根(1~4))？",all);for (int choose = 0; all > 0 ;System.out.printf("桌上有%d根火柴,请问你要拿几根(1~%d)？",all,Math.min(4, all))) {if (sc.hasNextInt()) {if ((choose = sc.nextInt()) >= 1 && choose <= Math.min(4, all)) {if (all - choose == 0) {System.out.println("你拿走了最后一根火柴……你输了~！纳命来！！~(X﹏X)~ \n");break;} else {System.out.printf("你拿走了%d根火柴。电脑想了想~ 恩 ~它拿走了%d根火柴。\n", choose,5 - choose);all -= 5;}} else if (choose > all) {System.out.printf("桌上没那么多火柴，你丫不识数么？？\n");} else {System.out.printf("你输入的火柴数量不是1~4……\n");}} else {String xiaohao = sc.next();System.out.printf("文盲,知道啥叫1~4不？！\n");}}}}</strong>

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