using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
namespace c练习
{
class Program
{
static void Main(string[] args)
{
/* string[] str = { "aaa", "ddd", "bbb","ccc" };
Array.Sort(str);//字符串数组排序a~z;
for (int i = 0; i < str.Length; i++)
{
if (i != str.Length - 1)
Console.Write(str[i] + ",");
else
Console.Write(str[i]);
}
Console.ReadKey();*/
/*string str1 = "deasfgders";
string substr="sf";
int count=0;
if (str1.IndexOf(substr) < 0)//字符串中是否包含子字符串
Console.WriteLine(str1 + "不包含" + substr);
else
{
while (str1.IndexOf(substr) >= 0)
{
str1=str1.Substring(str1.IndexOf(substr) + substr.Length);//字符串出现的次数
count++;
}
Console.WriteLine("{0}出现了{1}次",substr,count);
}
Console.ReadKey();*/
/*string str2 = "hello,new world";
string[] substr = str2.Split(',',' ');//返回指定字符串分割的字符串数组
foreach (string substr1 in substr)
Console.WriteLine(substr1);
Console.ReadKey();*/
/*string[] str = { "aaa", "ddd", "bbb", "ccc" };
string newstr =string.Join("@",str);//字符串的连接
Console.WriteLine(newstr);
Console.ReadKey();*/
/*int[] integer = {2,3,5,7,9,11};
int max = integer.Max();
int min = integer.Min();
double average = integer.Average();
int sum = integer.Sum();
Console.WriteLine("最大值是"+max);//求数组最大值
Console.WriteLine("最小值是" + min);//求数组最大值
Console.WriteLine("平均值值是" + average);//求数组最大值
Console.WriteLine("数组的和是" + sum);//求数组的和
Console.ReadKey();*/
/*int[] integer = { 2, 3, 1, 4, 5, 6, 5, 7 };
for(int i=0;i<integer.Length-1;i++)//选择排序
for (int j = i + 1; j < integer.Length; j++)
if (integer[i] > integer[j])
{
int temp = integer[i];
integer[i] = integer[j];
integer[j] = temp;
}
for (int i = 0; i < integer.Length; i++)
Console.Write(integer[i]+" ");
Console.WriteLine();
for(int i=0;i<integer.Length-1;i++)//冒泡排序
for(int j=0;j<integer.Length-1-i;j++)
if (integer[j] > integer[j + 1])
{
int temp = integer[j];
integer[j] = integer[j + 1];
integer[j + 1] = temp;
}
for (int i = 0; i < integer.Length; i++)
Console.Write(integer[i] + " ");
Console.ReadKey();*/
/*int[] integer=new int[4];//数组的大小是固定的，数据类型一定
ArrayList arr = new ArrayList();//集合的大小可变，可以存放各种类型的数据
arr.Add("abc");
arr.Add("def");
arr.Add("bcd");
arr.Reverse();
foreach (object arrs in arr)
{
Console.WriteLine(arrs);
}
arr.Sort();
foreach (object arrs in arr)
{
Console.WriteLine(arrs);
}
Console.ReadKey();*/
Console.WriteLine(Convert.ToString(88, 2));//十进制转换为二进制
Console.WriteLine(Convert.ToString(88, 8));//十进制转换为八进制
Console.WriteLine(Convert.ToString(88, 16));//十进制转换为十六进制
Console.WriteLine(Convert.ToInt32("1001011", 2));//二进制转换为十进制
Console.WriteLine(Convert.ToInt32("77", 8));//八进制转换为十进制
Console.WriteLine(Convert.ToInt32("aa", 16));//八进制转换为十进制
Console.ReadKey();
}
}
}
//string s1 = "qqq,ggg,ggg,ddd|ccc.eee";//字符串的拆分
//string[] str = s1.Split(',','|','.');
//foreach (string item in str)
//Console.WriteLine(item);
//string s1 = "sds,,sdsd,d,e";
//string[] strs = s1.Split(new char[]{','},StringSplitOptions.
// RemoveEmptyEntries);//除去空格
//foreach (string item in strs)
// Console.WriteLine(item);
string ss = "http:\\www.baidu.com";//第一个左斜线是转移字符
string yuming = ss.Substring(6);//输出为www.baidu.com
Console.WriteLine(yuming);
Console.ReadKey();
//字符串倒序
/* string s = Console.ReadLine();
char temp;
for (int i = s.Length - 1; i >= 0;i--)
{
Console.Write(s[i]);
}*/
//单词倒序
/*string s = Console.ReadLine();
string[] str = s.Split(' ');
for (int i = str.Length - 1; i >= 0; i--)
{
Console.Write(str[i]+" ");
}*/
//显示用户名和域名
/*string email = Console.ReadLine();
int index = email.IndexOf('@');
string name = email.Substring(0, index);
Console.WriteLine(name);
string yuming = email.Substring(index+1);
Console.WriteLine(yuming);*/
Console.ReadKey();
