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C#[编程实例]-编程入门试题
（1）整除之和
int i = 1, j = 0;
while (i <=100)
{
if (i % 2 == 0 || i % 3 == 0)
{ j = j + i;
}
i++;
}
Console.WriteLine("1到100之间能被2或者3整除的整数的和为：{0}", j);
Console.ReadKey();
（2）输密码
int i = 1;
for (i = 1; i <= i; i++)
{
Console.WriteLine ("请输入用户名：");
string a=Convert .ToString (Console .ReadLine ());
Console .WriteLine("请输入密码：");
string b = Convert.ToString(Console.ReadLine());
if (a == "aaa" && b == "888888")
{ Console .WriteLine ("登陆成功！");
break;
}
else
{ Console.WriteLine("您的用户名或密码有误，请重新输入"); }
}
Console.ReadLine();
（3）智能算数
int c = 1;
Console.WriteLine("请输入第一个数：");
int i1 = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("请输入第二个数：");
int i2 = Convert.ToInt32(Console.ReadLine());
if (i1 > 0 && i2 > 0)
{
i1 = i1 - 1;
c = i1 + i2;
Console.WriteLine("这两个数都为正数，计算结果为：{0}", c);
Console.ReadLine();
}
if (i1 < 0 && i2 < 0)
{
i1 = i1 - 10;
c = i1 * i2;
Console.WriteLine("这两个数都为负数，计算结果为：{0}", c);
Console.ReadLine();
}
if (i1 * i2 == 0)
{
Console.WriteLine("您所输的数据有误！");
Console.ReadLine();
}
else
c = -(i1 * i2);
Console.WriteLine("这两个数异号，计算结果为：{0}", c);
Console .ReadLine ();
（4）课本上的题 P60，2
int[,] a = new int[3, 4] { { 1, 10, 100, 1000 }, { 2, 20, 200, 2000 }, { 3, 30, 300,3000 } };
for (int i = 0; i < a.GetLength (0); i++)
{
for (int j = 0; j < a.GetLength(1); j++)
{ Console.Write("{0} ",a[i, j]); }
Console .WriteLine ();
}
Console.Read();
（5）6行6个数
int i = 1;
for (i = 1; i <= 36; i++)
{
Console.Write("{0}", i);
if (i % 6 == 0)
Console.WriteLine();
（6）P28
using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication10
{
using System;
struct rectangle
{
public int x, y;
public int width,height;
public rectangle(int a, int b, int w, int h)
{
x = a;
y = b;
width = w;
height = h;
}
}
class TestStruct
{
public static void Main()
{
//
rectangle myRect;
//
myRect.x = 20;
myRect.y = 30;
myRect.width = 200;
myRect.height = 300;
//
Console.WriteLine("My Rectange:");
Console.WriteLine("x = {0},y = {1}, width = {2}, heigh = {3}",myRect.x,myRect.y,myRect.width,myRect.height);
}
}
}
（7）矩形面积
class Program
{
static double tape(double L1, double W1)
{
double S;
S = L1 * W1;
Console.WriteLine("矩形的面积是{0}", S);
return S;
}
static void bijiao(double S1, double S2)
{
if (S1 - S2 > 0)
{ Console.WriteLine("矩形1的面积大于矩形2的面积"); }
if (S1 - S2 < 0)
{ Console.WriteLine("矩形1的面积小于矩形2的面积"); }
if (S1 - S2 == 0)
{ Console.WriteLine("矩形1的面积小于矩形2的面积"); }
}
static void Main(string[] args)
{
double s1, s2;
double a = 4, b = 5;
s1 = tape(a, b);
double c = 7, d = 3;
s2 = tape(c, d);
bijiao(s1, s2);
Console.Read();
}
}
}
（8） {
using System;
class TestOut
{
static int OutMultiValue(int a , out char b) //声明参数为输出参数
{
b = (char)a; return 0; //此方法为把字符型隐式转换为int类型
}
static void Main()
{
int t = 65 ;char m; //定义int类型变量t,r;char类型变量m
OutMultiValue(t ,out m); //调用方法
Console.WriteLine("m＝{0}" , m);
Console.ReadKey();
}
}
}
（9）比较两个矩形的大小
using System;
using System.Collections.Generic;
using System.Text;
namespace ConsoleApplication2
{
public class Rectangle
{
public double area;
public double Area()
{
Console.WriteLine("请输入矩形的长：");
double a = double.Parse(Console.ReadLine());
Console.WriteLine("请输入矩形的宽：");
double b = double.Parse(Console.ReadLine());
Console.WriteLine("矩形的长和宽为:{0}和{1}", a, b);
area = a * b;
Console.WriteLine("矩形的面积为：{0}",area );
return area;
}
public static void bijiao(double ss1, double ss2)
{
if (ss1 > ss2)
{ Console.WriteLine("s1的面积大于s2的面积"); }
else if (ss1 < ss2)
{ Console.WriteLine("s1的面积小于s2的面积"); }
else
Console.WriteLine("s1的面积等于s2的面积");
}
}
public class test
{
static void Main()
{
Rectangle s1 = new Rectangle();
Rectangle s2 = new Rectangle();
double areas1 = s1.Area();
double areas2 = s2.Area();
Rectangle.bijiao(areas1, areas2);
Console.Read();
}
}
}
P200 4,(2)
using System.IO;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
SaveFileDialog sfdlg = new SaveFileDialog();
sfdlg.Filter = "所有文件*.*|*.*|文本文件*.txt|*.txt|C#文件|*.cs|C文件|*.c";
sfdlg.InitialDirectory = "c:\\user";//设置对话框显示的初始路径
sfdlg.Title = "保存文本文件";
sfdlg.FilterIndex = 2; //把文件过滤器设为第二项“*.txt”
//如果用户单击文件保存对话框的“保存”按钮，向文件写入“This is test”
if (sfdlg.ShowDialog() == DialogResult.OK)
{
FileStream fs = new FileStream(sfdlg.FileName, FileMode.OpenOrCreate, FileAccess.Write);
StreamWriter fileStream = new StreamWriter(fs);
fileStream.WriteLine(textBox1.Text);
fileStream.Close();
}
}
private void button2_Click(object sender, EventArgs e)
{
OpenFileDialog duqu = new OpenFileDialog();
duqu.Filter = "所有文件*.*|*.*|文本文件*.txt|*.txt|C#文件|*.cs|C文件|*.c";
duqu.InitialDirectory = "C:";
duqu.ShowDialog();
FileStream ff = new FileStream(duqu.FileName, FileMode.Open, FileAccess.Read);
StreamReader ffs = new StreamReader(ff);
label1.Text = ffs.ReadToEnd();
ffs.Close();
P200 4.(3)
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
namespace WindowsApplication1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
{
OpenFileDialog duqu = new OpenFileDialog();
duqu.Filter = "所有文件*.*|*.*|文本文件*.txt|*.txt|C#文件|*.cs|C文件|*.c";
duqu.InitialDirectory = "C:";
duqu.ShowDialog();
label1.Text = duqu.FileName;
}
private void 字体ToolStripMenuItem_Click(object sender, EventArgs e)
{
if (fontDialog1.ShowDialog() == DialogResult.OK)
fontDialog1.ShowColor = true;
label1.Font = fontDialog1.Font;
}
}
}
最后更新：2017-04-03 14:53:58