C#代码-课后习题代码.doc

第一章 ：习题一、
习题二
using System; using System.Collections.Generic; namespace WindowsFormsApplication2
using System.Linq;using System.Text; public Form1()｛InitializeComponent();｝
namespace ConsoleApplication1 private void button1_Click(object sender, EventArgs e)
{class Program ｛ label1.Font =new Font("华文彩云",80);
{static void Main(string[] args) label1.ForeColor=System.Drawing.Color.Blue;
{ Console.WriteLine("Hello World!"); button1.Enabled=false; ｝｝｝
Console.Read();
} }
}}
第二章 习题二
private void button1_Click(object sender, EventArgs e){
String s, a;
s = Convert.ToString(textBox1.Text);
a = s.ToUpper();
textBox1.Text = a.ToString();}
private void button2_Click(object sender, EventArgs e) {
String s, a; s = Convert.ToString(textBox1.Text);
a = s.ToLower();textBox1.Text = a.ToString();
} } }
习题六
private void button1_Click(object sender, EventArgs e)
{string a; a = Convert.ToString(textBox1.Text);
MessageBox.Show(Convert.ToString(a)+",欢迎进入C#的世界！", "欢迎进入C#的世界！", MessageBoxButtons.OK, MessageBoxIcon.Information);}

习题三
private void button1_Click(object sender, EventArgs e)
{
int a, b, c, d, x;
x = Convert.ToInt32(textBox1.Text);
a = x/1000;
b = x/100-a*10;
c = x/10-a*100-b*10;
d = x%10;
textBox2.Text=Convert.ToString(a);
textBox3.Text= Convert.ToString(b);
textBox4.Text=Convert.ToString(c);
textBox5.Text=Convert.ToString(d);
}
习题四银行贷款的月还额
private void button1_Click(object sender, EventArgs e)
{
double p, r, a, b;
int n;
p = Convert.ToDouble(textBox1.Text);
r = Convert.ToDouble(textBox2.Text);
n = Convert.ToInt32(textBox3.Text);
b = Math.Pow((1 + r), n);
a = p * r * b / (b - 1);
textBox4.Text = a.ToString(".##");
}
习题五、随机数
private void button1_Click(object sender, EventArgs e)
{ Random intra = new Random(); int a=intra.Next(1, 101);
char b = (char)a; textBox1.Text = Convert.ToString(a);
textBox2.Text = Convert.ToString(b); }
第三章

习题二是否是闰年
private void button1_Click(object sender, EventArgs e)
{
int a;
a=Convert.ToInt32(textBox1.Text);
if (a % 4 == 0 && a % 100 != 0 || a % 400 == 0)
label2.Text = "闰年";
else
label2.Text = "不是闰年";
}
习题三一元二次方程组

private void button1_Click(object sender, EventArgs e) {
int a, b, c;double x;
a = Convert.ToInt32(textBox1.Text); b = Convert.ToInt32(textBox2.Text);
c = Convert.ToInt32(textBox3.Text); x=Math.Pow(b,2);

if (a == 0)
abel4.Text = "不是一元二次方程";
else { if (x - 4 * a * c == 0) label4.Text = "有两个相等的实根";
else if (x - 4 * a * c > 0) label4.Text = "有两个不等的实根";
else label4.Text = "无解";} }

习题四

private void button1_Click(object sender, EventArgs e)
{
double a, b, c, m, s;
a = Convert.ToDouble(textBox1.Text);
b = Convert.ToDouble(textBox2.Text);
c = Convert.ToDouble(textBox3.Text);
m = (a + b + c) / 2;
if (a > 0 && b > 0 && c > 0)
{
if (a + b > c && a + c > b &&b + c > a)
{

s = Math.Sqrt(m * (m - a) * (m - b) * (m - c));
label4.Text = "三角形面积为" + s;
}
else
{
MessageBox.Show("输入错误", "提示", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
label4.Text = ""; } }

else { MessageBox.Show("输入错误", "提示", MessageBoxButtons.OK,
MessageBoxIcon.Exclamation);
label4.Text = ""; } }

习题一、
private void button1_Click(object sender, EventArgs e)
{
int a, b, c, max, min;
a = Convert.ToInt32(textBox1.Text);
b = Convert.ToInt32(textBox2.Text);
c = Convert.ToInt32(textBox3.Text);
max = (a > b ? a : b) > c ? (a > b ? a : b) : c;
min = (a < b ? a : b) < c ? (a <b ? a : b) : c;
b = a + b + c - max - min;
label5.Text = max+","+b+","+min;

}

第四章 习题三
private void button1_Click(object sender, EventArgs e)
{ int s=0;
for(int i=1;i<=100;i++)
for (int j = 0; j <= i; j++)
{s = s + j;}
textBox1.Text = Convert.ToString(s);
}

private void button1_Click(object sender, EventArgs e)
{
int s = 0,u=0;
for (int i = 1; i <= 100; i++)
{
u=u+i-1;
s = s+u+i;

}
textBox1.Text = Convert.ToString(s);
}

习题五、3和7的倍数
private void button1_Click(object sender, EventArgs e)
{
for (int i = 1; i <= 100; i++) {
if (i % 3 == 0 && i % 7 == 0)
textBox1.Text =
textBox1.Text + "\r\n" + Convert.ToString(i); }

习题一
private void button1_Click(object sender, EventArgs e)
{
int s=0;
for (int i = 1; i <= 100; i++) {
s = s + i;
}
textBox1.Text = Convert.ToString(s)
第五章习题六
private void button1_Click(object sender, EventArgs e)
{ int[] a; int i, n;
n = Convert.ToInt32(textBox1.Text);
BestPerson f = new BestPerson(); f.getBestPosition(n, out a);
for (i = 0; i < n; i++)
textBox3.Text = textBox3.Text + Convert.ToString(a[i]); } }
public partial class BestPerson {
public void getBestPosition(int a, out int[] s)
{ s = new int[50]; int i, j = -1, k;
for (i = 0; i < a; i++) { s[i] = 0; }
for (i = 1; i <= a; i++)
{ k = 0;
do{j++; if (j == a) j = 0; if (s[j] == 0) k++;
} while (k != 7);
s[j] = i;
}}
第五章习题八
private void button1_Click(object sender, EventArgs e)
{
Student s = new Student();
MasterStudent m = new MasterStudent();
m.Age = Convert.ToInt32(textBox2.Text);
m.Name = textBox1.Text;
m.Number = textBox4.Text;
m.Sex = textBox3.Text;
m.Major = textBox5.Text;
m.Teacher = textBox6.Text;

if (m.UpdateAge(m.Age))
m.sayHallo();
else MessageBox.Show("年龄有错!");
}

}
public class Student
{private string number;public string Number
{ get { return number; }
set { number = value; }}
private string name; public string Name
{ get { return name; }set { name = value; } }

private string sex;
public string Sex { get { return sex; } set { sex = value; } }
private int age;
public int Age { get { return age; } set { age = value; }}
public Boolean UpdateAge(int a) {
if (a > 0 && a <= 120) { age = a; return true; }

else
return false;}
public void sayHallo() {
MessageBox.Show("我是一名学生，我的名字是：" + Name.ToString() + "，年龄：
" + Age.ToString() + "，性别：" + Sex.ToString() + "，学号：" + Number.ToString()); }}
public class MasterStudent : Student{
public string Major;
public string Teacher;
public new void sayHallo() {
MessageBox.Show("我是一名研究生，我的名字是：" + Name.ToString() + "，年龄：" + Age.ToString() + "，性别：" + Sex.ToString() + "，学号：" + Number.ToString() + "，方向：" + Major + "，指导老师" + Teacher);} }}

习题5
int fac(int n) { if (n > 0) {
if (n == 1) return (1);
else return (n * fac(n - 1)); }
else return 1; }
private void button1_Click(object sender, EventArgs e)
{ int n, s;
n = Convert.ToInt32(textBox1.Text);
s = fac(n);
textBox2.Text = Convert.ToString(s); }
}
}
第六章 习题七
private void button1_Click(object sender, EventArgs e)
{
int i; party[] p = new party[3];
party p1 = new party(); communistParty p2 = new communistParty();
kuomintang p3 = new kuomintang();
p[0] = p1; p[1] = p2; p[2] = p3;
for (i = 0; i < 3; i++)
p[i].sayPolicy();}}

public class party
{ public virtual void sayPolicy(){
MessageBox.Show("两岸同属于一个中国。");
}}

public class communistParty :party{
public override void sayPolicy(){
MessageBox.Show("两岸同属于一个中国，用一国两制统一中国。");

}}
public class kuomintang :party{
public override void sayPolicy(){
MessageBox.Show("两岸同属于一个中国，用三民主义统一中国。"); }
}}

private void button1_Click(object sender, EventArgs e)
{ Cat c = new Cat(); c.name = textBox1.Text;
Mouse m = new Mouse(); m.name = textBox2.Text;
c.getUp +=new sayGetUpDelegate(m.sayGetUp);
c.crow();}}

习题八
public delegate void sayGetUpDelegate();
public class Cat
{
public event sayGetUpDelegate getUp;
public string name;
public void crow()
{
MessageBox.Show(name+"喵~喵~喵~喵~喵~喵~");
getUp();
}
}
public class Mouse
{
public string name;
public void sayGetUp ()
{
MessageBox.Show(name+"快跑！！！！");

}
}
}

习题九
private void button1_Click(object sender, EventArgs e)
{ train t = new train(); t.name = textBox1.Text;
cat c = new cat(); c.name = textBox2.Text;
c.h = Convert.ToInt16(textBox3.Text);
t.nshow(); c.nshow();}
private void button2_Click(object sender, EventArgs e)
{ train t = new train();
cat c = new cat();
t.shout();
c.shout();}}
public interface makeVoice{ int h{get;set;} void shout();}
public abstract class Vehicle { public string name; public abstract void nshow();}
public abstract class Anima{ public string name; public abstract void nshow();}
public class train:Vehicle ,makeVoice{ int H; public int h
{ get { return this.H; } set { this.H = value; }}

public override void nshow(){MessageBox.Show("train的名字是"+name); }
public void shout(){MessageBox.Show("train" +"呜呜嗒嗒。。。。。。呜呜嗒嗒");} }
public class cat:Animal ,makeVoice{ int H;
public int h{
get { return this.H; }
set { this.H = value; } }

public override void nshow(){
MessageBox.Show("cat的名字是" + name+"身高是"+h); }
public void shout(){
MessageBox.Show("cat" +"喵喵喵。。。。。。喵喵喵");}}}

第七章 习题一
随机产生10个两位整数，找出其中最大值，最小值、高于平均数的数
private void button1_Click(object sender, EventArgs e) {
int sum = 0; int z; Random ra = new Random();
int[] a = new int[10];
for (int i = 0; i < a.Length; i++) { a[i] = ra.Next(10, 100); }
for (int i = 0; i < a.Length; i++){ textBox1.Text += Convert.ToString(a[i]+" ") };
for (int i = 0; i < a.Length; i++) { sum += a[i] };
z = sum / 10;
textBox4.Text = Convert.ToString(z)
for (int i = 0; i < a.Length; i++)
{
if (a[i] >= z)
{
textBox5.Text += Convert.ToString(a[i] + " ");
}
} Array.Sort(a);
textBox2.Text = Convert.ToString(a[9]);
textBox3.Text = Convert.ToString(a[0]); }

产生10个学生的成绩，并用冒泡进行排序
private void button1_Click(object sender, EventArgs e) {
Random ra = new Random();
int[] a = new int[10];
for (int i = 0; i < a.Length; i++){ a[i] = ra.Next(1, 100);
textBox1.Text += Convert.ToString(a[i] + " ");}

for (int i = 0; i < a.Length-1; i++)
{ for (int j = i + 1; j < a.Length; j++)
{ if (a[i] < a[j])

{ int t; t = a[i]; a[i] = a[j]; a[j] = t; } }}
for (int i = 0; i < a.Length; i++)
{ textBox2.Text += Convert.ToString(a[i] + " "); } }

交错数组
private void button1_Click(object sender, EventArgs e)
{
int[][] jcArray = new int[4][];
jcArray[0] = new int[] { 1, 32, 89, 6, 8 };
jcArray[1] = new int[] { 2,17,8 };
jcArray[2] = new int[] { 3,5};
jcArray[3] = new int[] { 4,9,23,12 };
textBox1.Text = "交错数组的数据:" + "\r\n";

foreach (int[] j in jcArray)
{
int x = 0;
foreach (int i in j)
{
x += i;
textBox1.Text += Convert.ToString(i) + "\t";
}
textBox1.Text += "\r\n"+"该行数据总和为："+Convert.ToString(x)+"\r\n";
}}}}

用二维数组存储学生成绩
private void button1_Click(object sender, EventArgs e)
{
int[,] cj = { { 1001, 93 }, { 1004, 78 }, { 1002, 59 }, { 1005, 87 }, { 2001, 55 } };
textBox1.Text = "学生成绩";
for(int i=0;i<cj .GetLength(0);i++)
for (int j = 0; j < cj.GetLength(1); j++)
{ if (j == 1)
textBox1.Text = textBox1.Text + "\t" + Convert.ToString(cj[i, j]);
else textBox1.Text = textBox1.Text + "\r\n" + Convert.ToString(cj[i, j]);
}
textBox1.Text = textBox1.Text + "\r\n" + "不及格的学生";

for (int i = 0; i < cj.GetLength(0); i++)
if (cj[i, 1] < 60)
textBox1.Text = textBox1.Text + "\r\n" + Convert.ToString(cj[i, 0])+ "\t"+Convert .ToString(cj[i,1])
textBox1.Text+="\r\n"+"平均成绩";
int sum = 0; int z; ;
for (int i=0;i<cj.GetLength(0);i++)
{ sum += cj[i, 1]; }
z = sum / cj.GetLe