//============================================================================

// Name        : std1.cpp

// Author      : chenyan

// Version     :

// Copyright   : Your copyright notice

// Description : Hello World in C++, Ansi-style

//============================================================================



#include <iostream>

#include <iomanip>

#include <locale>

using namespace std;



class A{

public:

	A(){total++;cout << "调用无参构造函数" << endl;};

	A(int num):it(num){total++;cout << "调用有参构造函数" << endl;}

	~A(){total--;}

	static int total;

	void set(int num){it = num;}

	int get(){return it;}

private:

	int it;

};

int A::total = 0;



int main() {

	A mya;

	char ch = 'a';

	const double PI = 3.1415926;

	int a  = 0X10;

	mya.set(100);

	cout << "mya.tatal="<< mya.total << endl;

    cout <<"mya.it="<< mya.get() << endl;

    cout << "OCT:"<< oct << "a=0"<< a << endl; //以八进制显示

    cout << "DEC:"<< dec << "a="<< a << endl; //以十进制显示

    cout << "HEX:"<< hex << "a=0X"<< a << endl; //以十六进制显示

    cout << "ASCII:'"<< ch << "'=" << (int)ch << endl;//字符a的ASCII码

    cout << dec;//下面全部内容以十进制格式显示

    cout <<"bool "<<"false:"<<false <<" true:"<< true << endl;

    cout << "char:"<<sizeof(char)<<endl;

    cout << "wchar_t:"<<sizeof(wchar_t)<<endl;

    cout << "short:"<<sizeof(short)<<endl;

    cout << "unsigned int:"<<sizeof(unsigned int)<<endl;

    cout << "signed int:"<<sizeof(signed int)<<endl;

    cout << "long int:"<<sizeof(long int)<<endl;

    cout << "long long:"<<sizeof(long long)<<endl;

    cout << "float:"<<sizeof(float)<<endl;

    cout << "double:"<<sizeof(double)<<endl;

    cout << "long double:"<<sizeof(long double)<<endl;//ANSI C99标准

    cout << "double long:"<<sizeof(double long)<<endl;

    cout << "PI="<< setprecision(8) << PI << endl;//设置输出的有效位为8位，cout默认最长

                                                  //输出精度为6位

    for(int i = 1;i <= 9;i ++){

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

    		cout << j << "*" << i << "=" << i * j;

    		cout << "\t";

    	}

    	cout << endl;

    }



	return 0;

}