<C#任务导引教程>练习四
//27，创建一个控制台应用程序，声明两个DateTime类型的变量dt，获取系统的当前日期时间，然后使用Format格式化进行规范
using System;
class Program
{
static void Main()
{
DateTime dt = DateTime.Now;
string strDate = String.Format("{0:D}", dt);
Console.WriteLine("今天的日期是:" + strDate);
}
}
//28,创建一个控制台应用程序，声明一个string类型变量str1，并初始化为“我钟爱C#语言程序设计”,然后用copy方法复制字符串str1，并赋值给字符串str2，最后输出字符串str2
using System;
class Program
{
static void Main()
{
string str1 = "我钟爱C#语言程序设计";
string str2;
str2 = string.Copy(str1);
Console.WriteLine(str2);
}
}
//29,CopTo方法
using System;
class Program
{
static void Main()
{
string str = "我钟爱C#语言程序设计";
Console.WriteLine("原字符串:\n" + str);
char[] myChar = new char[5];
str.CopyTo(0, myChar, 0, 5);//CopyTo（int需要复制的字符的起始位置，cha[]目标字符数名，指定目标数组中的开始存放位置，int指定要复制的字符个数）
Console.WriteLine("复制的字符串:");
Console.WriteLine(myChar);
}
}
我可以给你们大概算一下有多少个模块 就单纯说些代码的 硬件部门不算
构成设定CLI ，装置维护CLI，环境设定CLI，装置信息查看CLI.快照备份CLI，数据分割CLI，资源分割CLI，性能优化CLI。。。
server， mainserver 设定server，状态监视server，性能监视server，snapshotserver，备份还原server......
还有各种外部tools，还不算OS部门和FW部门
//30,字符串的加密与解密示例
using System;
class Program
{
static void Main()
{
string list = "kczutmhsuasasahsuihsuw";
char[] str = new char[80];
int i, j;
Console.Write("请输入一小写字母串（长度小于80）:");
string c = Console.ReadLine();
Console.Write("加密后成为:");
for (i = 0; i < c.Length; i++)
{
str[i] = c[i];
j = str[i] - 97;
str[i] = list[j];
Console.Write("{0}", str[i]);
}
Console.WriteLine();
}
}
//31,字符串的解密示例
using System;
class Program
{
static void Main()
{
string list = "qwertyuioplkjhgfdsazxcvbnm";
char[ ] str = new char[80];
int i, j;
Console.Write("请输入需解密的字符串:");
string c = Console.ReadLine();
Console.Write("原字符串是:");
for (i = 0; i < c.Length; i++)
{
str[i] = c[i];//
j = 0;
while (str[i] != list[j])
j++;
str[i] = (char)(j + 97);
Console.Write("{0}",str[i]);
}
Console.WriteLine();
}
}
//32，有三个字符串，要求找出其中最大者
using System;
class Program
{
static void Main()
{
Console.WriteLine("请先后输入三个字符串,每输入一个请按Enter键确认!");
string str;
Console.Write("请输入第1个字符串:");
string a = Console.ReadLine();
Console.Write("请输入第2个字符串:");
string b = Console.ReadLine();
Console.Write("请输入第3个字符串:");
string c = Console.ReadLine();
int m = String.Compare(a, b);
if (m > 0)
str = String.Copy(a);
else
str = String.Copy(b);
int n = String.Compare(c, str);
if (n > 0)
str = String.Copy(c);
Console.WriteLine("最大的字符串是:{0}", str);
}
}
//33,选择排序
using System;
class Program
{
static void Main()
{
string[ ] names = new string[5];
string max;
int i, j;
for(i=0;i<5;i++)
{
Console.Write("请输入{0}个国家的名字:",i+1);
names[i] = Console.ReadLine( );
}
for (i = 0; i < names.Length - 1; i++)
{
for(j=i+1;j<names.Length;j++)
{
int m = String.Compare(names[i], names[j]);
if (m < 0)
{
max = String.Copy(names[i]);
names[i] = String.Copy(names[j]);
names[j] = String.Copy(max);
}
}
}
Console.WriteLine("排序结果:");
for (i = 0; i < 5; i++)
{
Console.Write("{0} ", names[i]);
}
Console.WriteLine();
}
}
//34.ArrayList数组集合
using System;
using System.Collections;//ArrayList位于Collections中
class Program
{
static void Main()
{
ArrayList myAL = new ArrayList( );
myAL.Add("Hello");
myAL.Add("World");
myAL.Add("!");
Console.WriteLine("myAL Count: {0}", myAL.Count);//显示ArrayList的元素个数
Console.Write(" Value:");
foreach (Object obj in myAL)
Console.Write(" {0}", obj);
Console.WriteLine();
}
}
//35,输出一个表格的表头，调用方法
using System;
class Program{
static void printstar()
{
Console.WriteLine("*************");
}
static void print_message()
{
Console.WriteLine("* XSCJFXTJB *");
}
static void Main()
{
printstar();
print_message();
printstar();
}
}
//36,方法返回值
using System;
class MainClass
{
static int power(int x, int n)
{
int pow = 1;
while (n > 0)
{
n--;
pow *= x;
}
return pow;
}
static void Main()
{
int n = 3;
int x = 4;
char c = 'a';
Console.WriteLine("pow({0},{1})=){2}", x, n, power(x, n));
Console.WriteLine("pow('{0}',{1})=){2}", c, n, power(c, n));//注意char字符的输出格式
Console.WriteLine("pow({0},{1})=){2}", n,x, power(n,x));
}
}
//37,求取较大的数
using System;
class Program
{
static int max(int x, int y)
{
return (x >= y) ? x : y;
}
static void Main()
{
Console.WriteLine("请输入两个整数:");
Console.Write("a= ");
int a = Convert.ToInt32(Console.ReadLine());
Console.Write("b= ");
int b = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("{0:D}和{1:D}较大的数是:{2:D}",a,b,max(a,b));
}
}
//38,试编程实现方法的嵌套调用
using System;
class Program
{
static void prnline()
{
Console.Write(" - ");
}
static void print()
{
Console.Write(" * ");
prnline( );
return;
}
static void Main()
{
int i, j;
for (i = 0; i < 2; i++)
{
for (j = 0; j < 3; j++)
{
print();
}
Console.WriteLine();
}
}
}
//39,求4！
using System;
class Mainclass
{
static int fac(int n)
{
int y;
if (n == 1)
y = 1;
else
y = n * fac(n - 1);
return y;
}
static void Main()
{
Console.WriteLine("4!= {0}", fac(4));
}
}
