得到基本数据类型的字节数
#include <iostream>
using namespace std;
void main()
{
/*显示为所占字节数*/
cout<<"bool:"<<sizeof(bool)<<endl;
cout<<"char:"<<sizeof(char)<<endl;
cout<<"signed char:"<<sizeof(signed char)<<endl;
cout<<"unsigned char:"<<sizeof(unsigned char)<<endl;
cout<<"wchar_t:"<<sizeof(wchar_t)<<endl;
cout<<"short:"<<sizeof(short)<<endl;
cout<<"unsigned short:"<<sizeof(unsigned short)<<endl;
cout<<"int:"<<sizeof(int)<<endl;
cout<<"unsigned int:"<<sizeof(unsigned int)<<endl;
cout<<"long:"<<sizeof(long)<<endl;
cout<<"unsigned long:"<<sizeof(unsigned long)<<endl;
cout<<"float:"<<sizeof(float)<<endl;
cout<<"double:"<<sizeof(double)<<endl;
cout<<"long double"<<sizeof(long double)<<endl;
}