java2实用教程课后操作题.docx

2.1编写一个应用程序，给出汉字你、我、他在Unicode表中的位置。public class Output public static void main(String args) char chinaWord1 =你,chinaWord2 = 我, chinaWord3 = 他; System.out.println(汉字:+chinaWord1+的位置:+(int)chinaWord1); System.out.println(汉字:+chinaWord2+的位置:+(int)chinaWord2); System.out.println(汉字:+chinaWord3+的位置:+(int)chinaWord3); 2.2编写一个java应用程序，输出全部的希腊字母。public class Greekword public static void main (String args) int startPosition = 0,endPosition = 0; char cStart = , cEnd = ; startPosition = (int)cStart; endPosition = (int)cEnd; System.out.println(希腊字母表:); for (int i = startPosition; i = endPosition; i+) char c = 0; c = (char)i; System.out.print( +c); 3.1编写应用程序1！+2!+10！。public class Addition public static void main(String args) int i, j, add = 1, sum = 0; for (i = 1; i = 10; i+) for (j = 1; j = i; j+) add = add * j; sum = sum + add; System.out.println(sum=+sum); 3.2 编写一个应用程序求100以内的全部素数。 public class Prime public static void main(String args) int i, j; System.out.println(100以内的全部素数:); for (i = 2; i 100; i+) for (j = 2; j i / 2) System.out.print( +i); 3.3分别用do-while和for循环计算1+1/2!+1/3!+1/4!+的前20项和。public class Summation public static void main(String args) int i = 1, j, n = 1; double sum = 0; System.out.print(用for计算1+1/2!+1/3!+1/4!+的前20项和为：); for (; i = 20; i+) n = n * i; sum = sum + 1.0 / n; System.out.println( +sum); System.out.print(用do-while计算1+1/2!+1/3!+1/4!+的前20项和为：); do n = n * i; sum = sum + 1.0 / n; i+; while (i = 20); System.out.println( +sum); 3.4一个数如果恰好等于他的因子之和，这个数就称为完数。编写应用程序求1000之内的所有完数。public class Pefectnumber public static void main(String args) int i , j, num = 0; System.out.print(1000之内的所有完数:); for (i = 1; i = 1000; i+) for (j = 1, num = 0; j i; j+) if (i % j = 0) num = j + num; if (num = i) System.out.print( +i); 3.5编写应用程序，使用for循环语句计算8+88+888+前10项之和。public class Accumulation public static void main(String args) int i, j, sum = 0, n = 8, tem = 8; System.out.print(8+88+888+前10项之和为:); for (i = 1; i = 10; i+) sum = sum + tem; tem = tem * 10 + n; System.out.println( +sum); 3.6编写应用程序，输出满足1+2+3+n8888的最大正整数n。public class Intger public static void main(String args) int i, sum = 0; System