c#程序设计教程第二版李春葆课后编程题答案.doc

输入a,b求c = a + b
using 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);
}
}
}

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 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P38
using 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;　 //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P44
using System;
namespace Proj3_2
{ class 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 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}", 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.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。P47
using 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("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},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P50
using 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);
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P52
using 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.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(decimal));
}
}
}
求字符串子串在主串的位置P56
using 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.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P59
using 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, 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); //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 P60
using 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 P60
using 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P60
using System;
using System.Collections.Generic;
using System.Text;
namespace Proj3_10
{enum 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.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);
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 P72
using 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)
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;
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(string[] 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-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π/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
{
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("π={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;
using 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*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 int[10]{1,8,3,4,7,9,6,10,2,5};
int n=10,max1,max2,i;
max1=a[0]>a[1]?a[0]:a[1];
max2=a[0]>a[1]?a[1]:a[0];
for (i=2;i<n;i++)
if (max1<a[i])
{
max2=max1;
max1=a[i];
}
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(string[] args)
{
const int Max = 5; //考生数
int[] Ave = new int[Max]; //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++)
{
Ave[i] += grade[i,j]; //累加考生成绩
}
}
for (int k = 0; k < Max; k++)
Console.WriteLine("考生{0}平均成绩={1} ",k+1, Ave[k]/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 (int i = 0; i < no.Length; i++)
Console.Write("{0}\t",no[i]);
Console.WriteLine();
Console.Write("姓名:\t");
for (int i = 0; i < name.Length; i++)
Console.Write("{0}\t", name[i]);
Console.WriteLine();
}
static void Main(string[] args)
{
int[] no = new int[] { 2, 4, 5, 1, 3};
string[] name = new 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 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, EventArgs e)
{
tex