1. 将字符串“I am a good man” 输出为：“man good a am I”
using
System;
namespace ConsoleApplication3
{
class Program
{
static void Main( string [] args)
{
string str = " I am a good man " ;
string [] arrayStr = str.Split( ' ' ); //将字符串截取后存入数组中
Array.Reverse(arrayStr); //反序数组元素
foreach (var item in arrayStr)
{
Console.WriteLine(item);
}
Console.ReadLine();
}
}
}
namespace ConsoleApplication3
{
class Program
{
static void Main( string [] args)
{
string str = " I am a good man " ;
string [] arrayStr = str.Split( ' ' ); //将字符串截取后存入数组中
Array.Reverse(arrayStr); //反序数组元素
foreach (var item in arrayStr)
{
Console.WriteLine(item);
}
Console.ReadLine();
}
}
}
2. 有一列数1，1，2，3，5，........求第30个数. (用递归) 这个代码遍地都是，不解释......
using
System;
namespace ConsoleApplication2
{
class Program
{
static void Main( string [] args)
{
Console.WriteLine(Foo( 30 ));
Console.ReadLine();
}
public static int Foo( int i)
{
if (i <= 0 )
{
return 0 ;
}
else if (i > 0 && i <= 2 )
{
return 1 ;
}
else
{
return Foo(i - 1 ) + Foo(i - 2 );
}
}
}
}
namespace ConsoleApplication2
{
class Program
{
static void Main( string [] args)
{
Console.WriteLine(Foo( 30 ));
Console.ReadLine();
}
public static int Foo( int i)
{
if (i <= 0 )
{
return 0 ;
}
else if (i > 0 && i <= 2 )
{
return 1 ;
}
else
{
return Foo(i - 1 ) + Foo(i - 2 );
}
}
}
}
3.有一组字符串，要求输入每种组合，例如：数组{"a","b","c"}输出组合为：ab ac ,ba bc, ca cb
using
System;
namespace ConsoleApplication1
{
class Program
{
static void Main( string [] args)
{
string [] objstr = new string []
namespace ConsoleApplication1
{
class Program
{
static void Main( string [] args)
{
string [] objstr = new string []
{
" a " , " b " , " c " , " d " , " e " , " f " , " g "
};
for ( int i = 0 ; i < objstr.Length; i ++ )
{
Console.WriteLine( " 第{0}组组合为： " , i + 1 );
for ( int j = 0 ; j < objstr.Length; j ++ )
{
if (objstr[i] != objstr[j])
{
Console.Write(objstr[i] + objstr[j] + " " );
}
if (j == objstr.Length - 1 )
{
Console.Write( " \n\n " );
}
}
}
Console.ReadLine();
}
}
}
" a " , " b " , " c " , " d " , " e " , " f " , " g "
};
for ( int i = 0 ; i < objstr.Length; i ++ )
{
Console.WriteLine( " 第{0}组组合为： " , i + 1 );
for ( int j = 0 ; j < objstr.Length; j ++ )
{
if (objstr[i] != objstr[j])
{
Console.Write(objstr[i] + objstr[j] + " " );
}
if (j == objstr.Length - 1 )
{
Console.Write( " \n\n " );
}
}
}
Console.ReadLine();
}
}
}
4.打印5000以内的对称数：如 11,111,121,1221（华为面试题）
using
System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace DuiShu
{
class Program
{
static void Main( string [] args)
{
GetA( 5000 );
Console.ReadLine();
}
private static void GetA( int maxValue)
{
string temp = String.Empty;
string partA = String.Empty;
string partB = String.Empty;
int index = 0 ;
for ( int i = 0 ; i <= maxValue; i ++ )
{
if (i > 10 )
{
temp = i.ToString();
index = temp.Length / 2 ;
if (temp.Length % 2 == 0 )
{
partA = temp.Substring( 0 , index);
partB = temp.Substring(index, index);
}
else
{
partA = temp.Substring( 0 , index);
partB = temp.Substring(index + 1 , index);
}
if ((index == 1 && partA.Equals(partB)) ||
(index > 1 && partA.Equals(String.Concat(partB.ToArray().Reverse()))))
{
Console.WriteLine(temp);
continue ;
}
}
}
}
}
}
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace DuiShu
{
class Program
{
static void Main( string [] args)
{
GetA( 5000 );
Console.ReadLine();
}
private static void GetA( int maxValue)
{
string temp = String.Empty;
string partA = String.Empty;
string partB = String.Empty;
int index = 0 ;
for ( int i = 0 ; i <= maxValue; i ++ )
{
if (i > 10 )
{
temp = i.ToString();
index = temp.Length / 2 ;
if (temp.Length % 2 == 0 )
{
partA = temp.Substring( 0 , index);
partB = temp.Substring(index, index);
}
else
{
partA = temp.Substring( 0 , index);
partB = temp.Substring(index + 1 , index);
}
if ((index == 1 && partA.Equals(partB)) ||
(index > 1 && partA.Equals(String.Concat(partB.ToArray().Reverse()))))
{
Console.WriteLine(temp);
continue ;
}
}
}
}
}
}
