c#程序设计教程第二版李葆课后编程题答案

1、输入a,b求c = a + busing system;using system.collections.generic;using system.text;namespace proj2_1 class program static void main(string args) int a, b, c; console.write(a:); a = int.parse( console.readline(); console.write(b:); b = int.parse(console.readline(); c = a + b; console.writeline(a+b=0, c);

2、 using system;using system.collections.generic;using system.componentmodel;using system.data;using system.drawing;using system.text;using system.windows.forms;namespace proj2_2 public partial class form1 : form public form1() initializecomponent(); private void button1_click(object sender, eventargs

3、 e) int a, b, c; a = convert.toint16(textbox1.text); b = convert.toint16(textbox2.text); c = a + b; textbox3.text = convert.tostring(c); private void form1_load(object sender, eventargs e) private void textbox2_textchanged(object sender, eventargs e) 强制转换p38using system;using system.collections.gene

4、ric;using system.text;namespace proj3_1 class program static void main(string args) int i=65,i1,i2; double d = 66.3456,d1,d2; char c = a,c1,c2; console.writeline(i=0:d5,d=1:f,c=2, i, d, c); i1 = (int)d; /强制类型转换 d1 = i; /隐式类型转换 c1 = (char)i; /强制类型转换 console.writeline(i1=0:d5,d1=1:f,c1=2, i1, d1, c1);

5、 i2 = c; /隐式类型转换 d2 = (int)d; /强制类型转换 c2 = (char)d; /强制类型转换 console.writeline(i2=0:d5,d2=1:f,c2=2, i2, d2, c2); 赋值两同学信息数据，并在图中输出结果p44using system;namespace proj3_2class program struct student/类型声明应放在main函数的外面 public int xh; /学号 public string xm;/姓名 public string xb;/性别 public int nl;/年龄 public strin

6、g bh;/班号 static void main(string args) student s1,s2;/定义两个结构类型变量 s1.xh = 101; s1.xm = 李明; s1.xb = 男; s1.nl = 20; s1.bh = 07001; console.writeline(学号:0,姓名:1,性别:2,年龄:3,班号:4, s1.xh, s1.xm, s1.xb, s1.nl, s1.bh); s2 = s1;/将结构变量s1赋给s2 s2.xh = 108; s2.xm = 王华; console.writeline(学号:0,姓名:1,性别:2,年龄:3,班号:4, s2

7、.xh, s2.xm, s2.xb, s2.nl, s2.bh); 声明枚举类型color，给两成员赋值，定义三个变量，赋值运算输出相应值。p47using system;using system.collections.generic;using system.text;namespace proj3_3 class program enum color red=5, green, blue, white=1, black /类型声明应放在main函数的外面 static void main(string args) color c1, c2,c3; console.writeline(re

8、d=0,green=1,blue=2,white=3,black=4,color.red,color.green,color.blue,color.white,color.black); console.writeline(red=0,green=1,blue=2,white=3,black=4,(int)color.red,(int)color.green,(int)color.blue,(int)color.white,(int)color.black); c1 = color.red; c2 = c1 + 1; c3 = c2 + 1; console.writeline(c1=0,c2

9、=1,c3=2, c1, c2,c3); console.writeline(c1=0,c2=1,c3=2, (int)c1, (int)c2,(int)c3); 位运算符运用p50using system;using system.collections.generic;using system.text;namespace proj3_4 class program static void main(string args) byte b1, b2, b3; b1 = 10; b2 =(byte) b1; console.writeline(b2); b3 = (byte)(b1 2);

10、console.writeline(b3); b1 = 3; b2 = 6; b3 = (byte)(b1 & b2); console.writeline(b3); b3 = (byte)(b1 b2); console.writeline(b3); b3 = (byte)(b1 | b2); console.writeline(b3); 输出常用数据类型所用字节数p52using system;using system.collections.generic;using system.text;namespace proj3_5 class program static void main

11、(string args) console.writeline(byte类型所占字节数:0, sizeof(byte); console.writeline(char类型所占字节数:0, sizeof(char); console.writeline(int类型所占字节数:0, sizeof(int); console.writeline(float类型所占字节数:0, sizeof(float); console.writeline(double类型所占字节数:0, sizeof(double); console.writeline(decimal类型所占字节数:0, sizeof(deci

12、mal); 求字符串子串在主串的位置p56using system;using system.collections.generic;using system.text;namespace proj3_6 class program static void main(string args) string mstr,sstr; console.write(输入主串:); mstr = console.readline(); console.write(输入子串:); sstr = console.readline(); console.writeline(主串长度=0,子串长度=1, mstr

13、.length, sstr.length); if (string.compare(mstr, sstr) != 0) console.writeline(位置:0, mstr.indexof(sstr); else console.writeline(两个字符串相同); datatime结构的使用p59using system;namespace proj3_7 class program static void main(string args) datetime d1 = datetime.now; /定义当前日期时间变量 datetime d2 = new datetime(2009,

14、 10, 1); /定义一个日期时间变量 console.writeline(d1:0,d1); int i = d1.year; int j = d1.month; int k = d1.day; int h = d1.hour; int m = d1.minute; int s = d1.second; console.writeline(d1:0年1月2日3时4分5秒, i,j,k,h,m,s); console.writeline(d2:0,d2); console.writeline(相距时间:0,d2 - d1); datetime d3 = d1.adddays(100); /d

15、3为d1的100天后的日期 console.writeline(d3:0,d3); console.writeline(datetime.isleapyear(i); console.writeline(datetime.isleapyear(d2.year); 设计一个控制台程序，定义变量int a，b；float x，y。并求表达式（float）（a+b）/+(int)x%(int)y p60using system;using system.collections.generic;using system.text;namespace proj3_8 class program stat

16、ic void main(string args) int a = 2, b = 3; float x = 3.5f, y = 2.5f; console.writeline(0, (float)(a + b) / 2 + (int)x % (int)y); 设计一个控制台程序，定义变量int a，b, c;并求表达式（+c-1）&b+c/2 p60using system;using system.collections.generic;using system.text;namespace proj3_9 class program static void main(string args

17、) int a = 3, b = 4, c = 5; console.writeline(0, (+c - 1) & b + c / 2); 声明一个学生结构类型stud，包含学号，姓名，出生日期成员，定义stud结构的两个学生变量s1，s2并赋值，求他们出售在星期几及其相差天数p60using system;using system.collections.generic;using system.text;namespace proj3_10enum weekdayhz 星期日,星期一,星期二,星期三,星期四,星期五,星期六; class program struct stud/结构类型声

18、明应放在main函数的外面 public int xh;/学号 public string xm;/姓名 public datetime birthday;/出生日期 static void main(string args) stud s1, s2; s1.xh = 100; s1.xm = 李明; s1.birthday = new datetime(1985,10,18); s2.xh = 200; s2.xm = 王丽; s2.birthday = new datetime(1986,2,16); int i = (int)s1.birthday.dayofweek; console.

19、writeline(0出生在1,s1.xm,(weekdayhz)i); i = (int)s2.birthday.dayofweek; console.writeline(0出生在1, s2.xm, (weekdayhz)i); console.writeline(0和1相差2天, s1.xm, s2.xm, s2.birthday - s1.birthday); 输入一组整数（以输入0结束）分别输出其中奇数和偶数之和 p72using system;using system.collections.generic;using system.text;namespace proj4_13 c

20、lass program static void main(string args) int n,s1=0,s2=0; do n = int.parse(console.readline(); if (n%2=1) s1 += n; else s2 += n; while (n!=0); console.writeline(奇数之和=0,s1); console.writeline(偶数之和=0,s2); 输入正整数n，计算s=1+（1+2）+(1+2+3)+(1+2+3+n)using system;using system.collections.generic;using system.

21、text;namespace proj4_14 class program static void main(string args) int n,i,j,s=0; console.write(n:); n = int.parse(console.readline(); for (i = 1; i = n; i+) for (j = 1; j 13) console.writeline(输入的数值太大！); else for (i=0;i=n-1;i+) for (j=1;j15-i;j+) console.write( ); /每次循环显示2个空格 c=1; console.write(0

22、,c); for (j=1;j=i;j+) c=c*(i-j+1)/j; if (c100) if (c10) console.write(0 ,c); /显示3个空格 else console.write(0 ,c); /显示2个空格 else console.write(0 ,c); /显示1个空格 console.writeline(); 利用/4 = 1-1/3+1/5-1/7+1/(4n-3)-1/（4n-1） using system;using system.collections.generic;using system.text;namespace proj4_16 clas

23、s program static void main(string args) double pi=0.0; int i; for (i=1;i=2000;i+) if (i%2=1) pi=pi+1.0/(2*i-1); else pi=pi-1.0/(2*i-1); pi=4*pi; console.writeline(=0, pi); 输出三个数，其数值刚好等于其每个数字立方和（153=1+5+3）using system;using system.collections.generic;using system.text;namespace proj4_17 class program

24、 static void main(string args) int i, n, a, b, c; for (i = 100; i a1?a0:a1; max2=a0a1?a1:a0; for (i=2;in;i+) if (max1ai) max2=max1; max1=ai; console.writeline(max1=0,max2=1,max1,max2); 用一个二维数组存放5个考试4门功课的考试成绩，求每个考生的平均成绩 using system;using system.collections; using system.collections.generic;using sys

25、tem.text;namespace proj5_7 class program static void main(string args) const int max = 5; /考生数 int ave = new intmax; /定义一个一维数组存储考生的总成绩 int, grade=88,75,62,84,96,85,75,92, /定义二维数组存储考生成绩 68,63,72,78,95,89,76,98, 76,65,72,63; for(int i=0; imax; i+) for(int j=0; j4; j+) avei += gradei,j; /累加考生成绩 for (in

26、t k = 0; k max; k+) console.writeline(考生0平均成绩=1 ,k+1, avek/4.0); 用两个一维数组分别存放5个学生的学号和姓名，分别按学号好姓名进行排序，输出排序后结果 using system;using system.collections.generic;using system.text;namespace proj5_8 class program const int max = 5; static void disp(int no,string name,string str) console.writeline(str); conso

27、le.write(学号:t); for (int i = 0; i no.length; i+) console.write(0t,noi); console.writeline(); console.write(姓名:t); for (int i = 0; i name.length; i+) console.write(0t, namei); console.writeline(); static void main(string args) int no = new int 2, 4, 5, 1, 3; string name = new string smith,john,mary,c

28、herr,tomn; disp(no, name,排序前：); array.sort(no, name); disp(no, name,按学号排序后：); array.sort(name, no); disp(no, name, 按姓名排序后：); 计算器 using system;using system.collections.generic;using system.componentmodel;using system.data;using system.drawing;using system.text;using system.windows.forms;namespace prj

29、8_3 public partial class form1 : form private string s; private double x, y; private button btn; public form1() initializecomponent(); private void form1_load(object sender, eventargs e) textbox1.text = ; label1.text = ; private void buttond_click(object sender, eventargs e) btn = (button)sender; te

30、xtbox1.text = textbox1.text + btn.text; private void buttonop_click(object sender, eventargs e) btn = (button)sender; /messagebox.show(btn.name, 信息提示, messageboxbuttons.ok); if (btn.name!=button12) /用户不是单击“=”命令按钮 x = convert.todouble(textbox1.text); textbox1.text = ; s = btn.name; /保存用户按键 label1.tex

31、t = x.tostring(); else /用户单击“=”命令按钮 if (label1.text = ) messagebox.show(输入不正确!, 信息提示,messageboxbuttons.ok); else y = convert.todouble(textbox1.text); switch(s) case button13: /用户刚前面单击“+”命令按钮 textbox1.text = (x + y).tostring(); break; case button14: /用户刚前面单击“-”命令按钮 textbox1.text = (x - y).tostring();

32、 break; case button15: /用户刚前面单击“”命令按钮 textbox1.text = (x * y).tostring(); break; case button16: /用户刚前面单击“”命令按钮 if (y = 0) messagebox.show(除零错误!, 信息提示,messageboxbuttons.ok); else textbox1.text = (x / y).tostring(); break; label1.text = textbox1.text; 模式窗体，无模式窗体调用using system;using system.collections.

33、generic;using system.componentmodel;using system.data;using system.drawing;using system.text;using system.windows.forms;namespace proj8_1 public partial class form1 : form public form1() initializecomponent(); private void button1_click(object sender, eventargs e) form myform = new form1_1(); myform

34、.showdialog(); /以模式窗体方式调用 private void button2_click(object sender, eventargs e) form myform = new form1_2(); myform.show(); /以无模式窗体方式调用 private void form1_load(object sender, eventargs e) private void form1_load_1(object sender, eventargs e) 窗体设计using system;using system.collections.generic;using system.componentmodel;using system.data;using system.drawing;using system.text;using system.windows.forms;namespace proj8_2 public partial class form1 : form private int n=0