C#练习题--第三篇

static void Main(string[] args){         
	int Sum = 0;                          
	for (int i = 1;i <= 10;i++){              
		if (i % 2 == 1)                                        
		Sum += i;        
	} 
	Console.WriteLine(Sum);     
} 

程序的输出结果:25

static void Main(string[] args){             
	int a=2, b=7, c=5;             
	switch (a > 0){                  
		case  true :                      
		switch (b < 10){                          
			case true: Console.Write("^"); break;                         
			case false: Console.Write("!"); break;                     
		}                      
		break;                 
		case false :                      
		switch (c == 5){                          
			case false: Console.Write("*"); break;                         
			case true: Console.Write("#"); break;                     
		}                      
		break;             
	}              
	Console.Read();         
}

程序最终的输出结果:^

static void Main(string[] args){             
	try{                 
		int x = Convert.ToInt32(Console.ReadLine());                 
		int y = Convert.ToInt32(Console.ReadLine());                 
		int z = x / y;             
	}             
	catch (FormatException){                 
		Console.WriteLine("格式不符");             
	}             
	catch (DivideByZeroException){                 
		Console.WriteLine("除数不能是0");             
	}             
	catch (Exception){                 
		Console.WriteLine("Exception!");             
	}            
	finally{                 
		Console.WriteLine("thank you for using the program!");             
	}             
	Console.ReadLine(); 
} 

若分别从键盘上输入5和x，则程序的最终执行结果:格式不符 
thank you for using the program! 

class Program{         
	static void Main(string[] args){             
		Taxi t = new Taxi();             
		Console.WriteLine(t.isInitialized );             
		Console.ReadLine();         
	}   
} 

public class Taxi{         
	public bool isInitialized = false;         
	public  Taxi(){             
		isInitialized = true;         
	} 
} 

程序最终的输出结果:True

class Program{
	static void Main(string[] args){                
		Mouse m = new Mouse();                
		m.Eat();                
		m.Sleep();         
	}      
}
 
public abstract class Animal{  
	public abstract void Sleep();        
	public virtual void Eat(){ 
		Console.Write ("eat something"); 
	}         
} 

public class Mouse : Animal{   
	public override void Sleep(){
		Console.Write ("mouse sleeping!");
	}  
	
	public override void Eat(){
		Console.Write ("eat cheese!");
	} 
}  

程序的输出结果:eat cheese! mouse sleeping!

class Program{          
	static void Main(string[] args){              
		SharedClass sc = new SharedClass();             
		sc.SetDataA("interface IpartA");             
		Console.ReadLine();         
	}     
}  
    
public interface IpartA{          
	void SetDataA(string dataA);     
}   
   
public class SharedClass : IpartA{          
	private string DataA;         
	private string DataB;          
	public void SetDataA(string dataA){              
		DataA = dataA;              
		Console.WriteLine("{0}", DataA);         
	}     
}  
程序最终的输出结果是  interface IpartA

static void Main(string[] args){             
	int m, n, i, j, s= 0;             
	Console.WriteLine("请输入m,n的值");             
	m = Convert.ToInt32(Console.ReadLine());             
	n = int.Parse(Console.ReadLine());             
	if (m < n){
		i = m;   
	}                 	          
	else{
		i = n; 
	}                 	            
	for (j = i; j > 0; j++){
		if (j % m == 0 && j % n == 0){
			s = j;
			break;
		}
	}
	Console.WriteLine("{0}", s);
} 

若从键盘上分别输入4和6，则程序最终的输出结果:12

static void Main(string[] args){ 
	int[] pins = {9,3,7,2}; 
	for (int index = 0;index != pins.Length;index++){                
		int pin = pins[index];                
		System.Console.Write(pin); 
	} 
	foreach (int i in pins){ 
		Console.Write (i); 
	}
} 

程序的输出结果是93729372

class A{  
	public void F(){ 
		Console.Write("A");  
	} 
	public void F(string chr){  
		Console.Write("B"); 
	} 
} 

class B:A{  
	public void F(){  
		Console.Write("B"); 
	}
	static void Main(){  
		B objB=new B();  
		objB.F(); 
	}  
} 

//分析一下C#代码，根据面向对象的多态性，代码的运行结果是B

public class Person{
	private int age = 0;
	public int Age{
		get{return age;}
		set{
			if(value >= 18){
				Console.WriteLine("成年人");
			}
			else{
				Console.WrteLine("未成年人"); 
			}
		}
	}
}

public class People:Person{
    public People(){
		Console.Write("不得入内"); 
	}
}

class Test{
	static void Main (string[]args){
		People shang = new People();
		shang.Age = 17;
	}
}

运行结果:不得入内未成年人