C++入门--2.0基本类型

#include<limits.h>
#inclede<iostream>
#define ZERO 0 //

int main()
{
	using namespace std;
	//----------------------1.0 测试整形基本数据类型的长度，还有最大值--------------

	////赋予最大值
	//int limit_int=INT_MAX;
	//short limit_short=SHRT_MAX;
	//long limit_long=LONG_MAX;
	//long long limit_llong=LLONG_MAX;
 //   
	////输出所占字节
	//cout<<"int is : "<<sizeof(int)<<" bytes"<<endl;
	//cout<<"short is : "<<sizeof(short)<<" bytes"<<endl;
	//cout<<"long is : "<<sizeof(long)<<" bytes"<<endl;
	//cout<<"long long is : "<<sizeof(long long)<<" bytes"<<endl;
 //   
	////打印出最大值
	//cout<<"Maximum values:"<<endl;
	//cout<<"int : "<<limit_int<<endl;
	//cout<<"short : "<<limit_short<<endl;
	//cout<<"long : "<<limit_long<<endl;
	//cout<<"long long is : "<<limit_llong<<endl;

	//----------------------2.0 无符号类型 +1 -1时候的现象 --------------

	//最大值 +1
	//short sam=SHRT_MAX;
	//unsigned short sue=sam;

	//cout<<"sam has "<<sam<<"RMB"<<endl;
	//cout<<"sue has "<<sue<<"RMB"<<endl;
	//cout<<"add 1yuan to each account"<<endl;

	//sam++;
	//sue++;

	//cout<<"sam has "<<sam<<"RMB"<<endl;
	//cout<<"sue has "<<sue<<"RMB"<<endl;

	////最小值 -1 
	//sam=ZERO;
	//sue=ZERO;
	//cout<<"sam has "<<sam<<"RMB"<<endl;
	//cout<<"sue has "<<sue<<"RMB"<<endl;

	//cout<<"take 1yuan form each account"<<endl;
	//sam--;
	//sue--;
	//
	//cout<<"sam has "<<sam<<"RMB"<<endl;
	//cout<<"sue has "<<sue<<"RMB"<<endl;


	//----------------------3.0 使用 8进制，10进制，16进制赋值--------------------

	//int decimal=199;//十进制
	//int octal=077;//八进制
	//int hexadecimal=0x6F;//十六进制

	//cout<<"decimal : "<<decimal<<endl;
	//cout<<"octal : "<<octal<<endl;
	//cout<<"hexadecimal : "<<hexadecimal<<endl;

	//----------------------4.0 十进制输入，8进制，16进制输出 --------------------

	//int chest=45;
	//int waist=45;
	//int inseam=45;

	//cout<<"decimal "<<chest<<endl;
	//
	//cout<<oct;//转换为8进制显示
	//cout<<"octal "<<waist<<endl;

	//cout<<hex;//转换为16进制显示
	//cout<<"the hexadecimal "<<inseam<<endl;

	//cout<<dec;//转换为默认十进制输出
	//cout<<"decimal "<<chest<<endl;

	//----------------------5.0 字符转换数字并输出，用cout.put()函数  --------------------

	//char keychar='y';
	//int keyint=keychar;//将y对应的 ASCII码存储在int变量中
	//cout<<"Keychar : "<<keychar<<endl;
	//cout<<"The ASCII code for Keychar is : "<<keyint<<endl;

	//
	//keychar++;//字符+1 效果显示下一个字幕
	//keyint=keychar;
	//cout<<"Keychar : "<<keychar<<endl;
	//cout<<"The ASCII code for Keychar is : "<<keyint<<endl;

	//cout<<"Displaying char keychar using cout.put()"<<endl;
	//cout.put(keychar);//直接输出char变量
	//cout.put('!');
	//cout<<endl;

	//----------------------6.0 转义字符的  --------------------
	//
	//cout<<"\a"<<endl;//发出振铃
	//cout<<"i say \"happy\",and what you think?"<<endl;//输出双引号
	//cout<<"Enter you agent code:______";
	//cout<<"\b\b\b\b\b\b";//退格键
	//int number;
	//cin>>number;
	//cout<<"You Entered "<<number<<endl;


	//----------------------7.0 浮点数的精度 --------------------

	//float a=2.34E+22;
	//float b=a+1.0f;
	//cout<<"b= "<<b<<endl;
	//cout<<"a = "<<a<<endl;//float 只能表示数字中的前六位，所以第二十三位忽略不计
	//cout<<"b-a = "<<b-a<<endl;

	//----------------------8.0 算数运算符 --------------------
	
	cout.setf(ios_base::fixed,ios_base::floatfield);//按浮点打印输出
	float hats,heads;

	cout<<"Enter a number : ____\b\b\b\b";
	cin>>hats;
	cout<<"Enter another  number____\b\b\b\b ";
	cin>>heads;

	cout<<"hats = "<<hats<<"; heads = "<<heads<<endl;
	cout<<"hats + heads = "<<hats+heads<<endl;
	cout<<"hats - heads = "<<hats-heads<<endl;
	cout<<"hats * heads = "<<hats*heads<<endl;
	cout<<"hats /heads = "<<hats/heads<<endl;
	//cout<<"hats%heads = "<<hats%heads<<endl;//不能求模，求模要求都是整形数字。



	


	cin.get();
	return 0;

}