学步园

之前一直搞不清楚C++中各基本内置类型的字节数，今天运行了一下。C++基本内置类型一共十种，short,int,unsigned,long;bool;char,wchar_t;float,double,long double.与《C++primer》中不一样的一点是：在我的机器上long double也是8Byte,即64位。而书上说的是“long double 类型用三个或四个字（96位或128位）来表示”。

#include <iostream>
using namespace std;
int main()
{
    cout<<"unsigned:"<< sizeof(unsigned)<<endl;//4
    cout<<"int:"<< sizeof(int)<<endl;//4
    cout<<"short:"<<sizeof(short)<<endl;///2
    cout<<"long:"<<sizeof(long)<<endl;///4
    cout<<"char:"<< sizeof(char)<<endl;//1
    cout<<"wchar_t:"<<sizeof(wchar_t)<<endl;//2
    cout<<"bool:"<< sizeof(bool)<<endl;//1
    cout<<"float:"<< sizeof(float)<<endl;//4
    cout<<"double:"<< sizeof(double)<<endl;//8
    cout<<"long double:"<< sizeof(long double)<<endl;//8
    return 0;
}