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; cons

2、ole.writeline("a+b=0", c); 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 bu

3、tton1_click(object sender, eventargs 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

4、system;using system.collections.generic;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; /

5、强制类型转换 console.writeline("i1=0:d5,d1=1:f,c1=2", i1, d1, c1); 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 in

6、t xh; /学号 public string xm;/姓名 public string xb;/性别 public int nl;/年龄 public string 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", s

7、1.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.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 pro

8、j3_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("red=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

9、,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=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 syste

10、m;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); console.writeline(b3); b1 = 3; b2 = 6; b3 = (byte)(b1 & b2); console.writeline(b3); b3 =

11、(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(string args) console.writeline("byte类型所占字节数:0", sizeof(byte); console.writelin

12、e("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(decimal); 求字符串子串在主串的位

13、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

14、,子串长度=1", mstr.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; /

15、定义当前日期时间变量 datetime d2 = new datetime(2009, 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&

16、quot;,d2); console.writeline("相距时间:0",d2 - d1); datetime d3 = d1.adddays(100); /d3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

17、p60using system;using system.collections.generic;using system.text;namespace proj3_8 class program static 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

18、 system;using system.collections.generic;using system.text;namespace proj3_9 class program static void main(string args) 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 sys

19、tem.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

20、.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.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); con

21、sole.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 class program static void main(string args) int n,s1=0,s2=0; do n = int.parse(console.readline(); if (n%2=1)

22、 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.text;namespace proj4_14 class program static void main(string args) int n,i,j,s=0;

23、console.write("n:"); n = int.parse(console.readline(); for (i = 1; i <= n; i+) for (j = 1; j <= i; j+) s += j; console.writeline("s=0", s); 输出n阶杨辉三角形，n不能大于13 using system;using system.collections.generic;using system.text;namespace proj4_15 class program static void main(st

24、ring args) int i,j,c,n; console.write("n:"); n=int.parse(console.readline(); if (n>13) console.writeline("输入的数值太大！"); else for (i=0;i<=n-1;i+) for (j=1;j<15-i;j+) console.write(" "); /每次循环显示2个空格 c=1; console.write("0 ",c); for (j=1;j<=i;j+) c=c*(i-

25、j+1)/j; if (c<100) if (c<10) 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;namespac

26、e proj4_16 class 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=1³+5³+3³）using system;using system.collections.generic;u

27、sing system.text;namespace proj4_17 class program static void main(string args) int i, n, a, b, c; for (i = 100; i <= 999; i+) n = i; c = n % 10; n = n / 10; b = n % 10; n = n / 10; a = n; if (a * a * a + b * b * b + c * c * c = i) console.writeline("0 1 2 = 3", a, b, c,a*a*a+b*b*b+c*c*

28、c); /console.write("0 ", i); console.writeline(); 假设十个整数用一个一维数组存放，求其最大值和次大值 using system;using system.collections.generic;using system.text;namespace proj5_6 class program static void main(string args) int a = new int101,8,3,4,7,9,6,10,2,5; int n=10,max1,max2,i; max1=a0>a1?a0:a1; max2=a

29、0>a1?a1:a0; for (i=2;i<n;i+) if (max1<ai) 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 system.text;namespace proj5_7 class program static void main(

30、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; i<max; i+) for(int j=0; j<4; j+) avei += gradei,j; /累加考生成绩 for (int k = 0; k < max; k+) console.writeline("考

31、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); console.write("学号:t"); for (

32、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

33、 string "smith","john","mary","cherr","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

34、 system.componentmodel;using system.data;using system.drawing;using system.text;using system.windows.forms;namespace prj8_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, eventa

35、rgs e) textbox1.text = "" label1.text = "" private void buttond_click(object sender, eventargs e) btn = (button)sender; textbox1.text = textbox1.text + btn.text; private void buttonop_click(object sender, eventargs e) btn = (button)sender; /messagebox.show(btn.name, "信息提示&qu

36、ot;, 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.text = 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",me

37、ssageboxbuttons.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(); break; case "button15": /用户刚前面单击“×”命令按钮 textbox

38、1.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.gen

39、eric;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.sh

40、owdialog(); /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.drawi