Visual C++ 2008入门经典 第三章判断和循环

// 第三章判断和循环

/* 

3.1 比较数据值

    3.1.1 if语句

	//A-Z 是65-90

	//a-z 97-122

	//有一个将小写字母转换为大写的ISO/ANSI C++库函数 toupper()

	位于标准文件<ctype>中 



	3.1.3 扩展的if语句



	3.1.4 嵌套的if-else语句



	3.1.5 逻辑运算符和表达式

	&&  逻辑与

	||  逻辑或

	!   逻辑非



	3.1.6 条件运算符



	3.1.7 switch语句



	3.1.8 无条件转移



3.2 重复执行语句块

    3.2.1 循环的概念



	3.2.2 for循环的变体

	1. 使用continue

	2. 浮点循环计数器



	3.2.3 while循环



	3.2.4 do - while循环



	3.2.5 嵌套的循环



3.3 C++/CLI编程

	*/

//练习题一

//#include <iostream>

//using namespace std;

//int main()

//{

	//while循环

	/*int value=0, sum=0, i=0;

	bool tmp=true;

	while(tmp==true)

	{

	    cout<<"请输入你要计算的数值(值为0时结束):";

		cin>>value;

		if(value == 0){

		    tmp=false;

		}

	    sum +=value;

		i++;

	}

	cout<<"一共输入了"<<i<<"次，总数为:"<<sum<<endl;*/



	/*int value=0, sum=0, i=0;

	bool tmp=true;

	for(;;){

	    cout<<"请输入你要计算的数值(值为0时结束):";

		cin>>value;

		if(value == 0){

		    break;

		}

	    sum +=value;

		i++;

	}

	cout<<"一共输入了"<<i<<"次，总数为:"<<sum<<endl;*/

	

	/*int value=0, sum=0, i=0;

	bool tmp=true;

	do{

	    cout<<"请输入你要计算的数值(值为0时结束):";

		cin>>value;

		if(value == 0){

		    tmp=false;

		}else{

			sum +=value;

			i++;

		}

	}while(tmp==true);

	cout<<"一共输入了"<<i<<"次，总数为:"<<sum<<endl;





    return 0;*/

//}





//练习题二

/*#include <iostream>

using namespace std;

int main()

{

    char value=0;

	int number=0;

	for(;;)

	{

	     cout<<"请输入字符进行计算(输入q退出):";

		 cin>>value;

		 if(value=='q' || value == 'Q'){

		     break;

		 }

		 switch(value){

		 case 'a':

		 case 'e':

		 case 'i':

		 case 'o':

		 case 'u':

			 number += 1;

			 break;

		 }

	}

	cout<<"一共输入了"<<number<<"次元音字母"<<endl;

    return 0;

}*/





//练习题三

/*#include <iostream>

#include <iomanip>

using namespace std;

int main()

{

	//cout<<setw(17);

	for(int i=1; i<=12; i++){

		if(i==1)

			cout<<setw(8)<<" ";

	     cout<<setw(5)<<i;

	}



	cout<<endl;

	for(int i=2; i<=12; i++)

	{

		cout<<setw(5)<<i<<" | "<<setw(5);

		for(int j=1; j<=i; j++)

		{

		    cout<<setw(5)<<i*j;

		}

	    cout<<endl;

	}

    return 0;

}*/



//练习题四

#include <iostream>

using namespace std;

//十六进制数

const int text = 0x01;    //0000 0000 0000 0001 ===1

const int binary = 0x02;  //0000 0000 0000 0002 ===2

const int read = 0x10;    //0000 0000 0000 0010 ===16

const int write = 0x20;   //0000 0000 0000 0020 ===32

const int append = 0x40;  //0000 0000 0000 0040 ===64



int main()

{

	int mode=0;

	for(int modeSelect =0; modeSelect <6; modeSelect++)

	{

		cout<<"modeSelect:"<<modeSelect<<endl;

		switch(modeSelect)

		{

		case 0:

			mode = text | read;

			//0000 0000 0000 0001

			//0000 0000 0000 0010

			//0000 0000 0000 0011 ==17

			//cout<<"mode:"<<mode<<endl;

			break;

		case 1:

			mode = text | write;

			//0000 0000 0000 0001

			//0000 0000 0000 0020

			//0000 0000 0000 0021 == 33

			//cout<<"mode:"<<mode<<endl;

			break;

		case 2:

			mode = text | append;

			//0000 0000 0000 0001

			//0000 0000 0000 0040

			//0000 0000 0000 0041 ==65

			//cout<<"mode:"<<mode<<endl;

			break;

		case 3:

			mode = binary | read;

			//0000 0000 0000 0002

			//0000 0000 0000 0010

			//0000 0000 0000 0012 ==18

			//cout<<"mode:"<<mode<<endl;

			break;

		case 4:

			mode = binary | write;

			//0000 0000 0000 0002

			//0000 0000 0000 0020

			//0000 0000 0000 0022 ==34

			//cout<<"mode:"<<mode<<endl;

			break;

		case 5:

			mode = binary | append;

			//0000 0000 0000 0002

			//0000 0000 0000 0040

			//0000 0000 0000 0042 ==66

			//cout<<"mode:"<<mode<<endl;

            break;

		}



		//确定被设定的模式，并输出它

		//0000 0000 0000 0011

		//0000 0000 0000 0001

		//0000 0000 0000 0001 ok text





		//0000 0000 0000 0011

		//0000 0000 0000 0012

		//0000 0000 0000 0010 ok binary

		//=====这里又弄不错了样，不知道&咱算出来的,是这样吗？

		//弄不懂哦



		//如果将16进制转换为32位的二进制然后进行 与操作，好像出现的是正确的

		if(mode & text){

		     cout<<"mode is (text,";

		}else if(mode & binary){

		     cout<<"mode is (binary,";

		}

		cout<<endl;



		if(mode & read){

		    cout<<"read)";

		}else if(mode & write){

		    cout<<"write)";

		}else if(mode & append){

		    cout<<"append)";

		}

		cout<<endl;

	}

	return 0;

}



//练习题五 -> 

//第五题

/*#include "stdafx.h"

#include <iostream>

using namespace System;



int main(array<System::String ^> ^args)

{

    

	ConsoleKeyInfo keypress;

	do{

		keypress = Console::ReadKey(true);

		Console::Write(L"You Pressed ");

		if(safe_cast<int>(keypress.Modifiers) > 0)

		{

			Console::WriteLine(L" {0}, ", keypress.Modifiers);

		}

		Console::WriteLine(L"{0} which is the {0} character",keypress.Key, keypress.KeyChar);

	}while(keypress.Key != ConsoleKey::Escape);



	system("pause");

    return 0;

}*/



//第六题

#include "stdafx.h"

#include <iostream>

using namespace System;





int main(array<System::String ^> ^args)

{

    String^ str="Hello world Xlc Aeiou @@@";



	int count=0, noLetter=0, Bletter=0, Sletter=0;



	for each(wchar_t ch in str)

	{

		//Console::Write(L"{0}",ch);

		//Char::IsLetter(ch)

		if(Char::IsLetter(ch)){

			if(ch>='A' && ch<='Z'){

				Bletter++;

			}else if(ch>='a' && ch<='z'){

				Sletter++;

			}		

		}else{

		    noLetter++;

		}

		count++;

	}

	Console::WriteLine(L"字符串长度为:{0} 大写字母为:{1} 小写字母为:{2} 其它字符为:{3}",count,Bletter,Sletter,noLetter);

	//cout<<"字符串长度为:"<<count<<" "<<Bletter<<" "<<Sletter<<" "<<noLetter<<endl;

    system("pause");

    return 0;

}