1．编程实现：

用sizeof运算符计算C++中char, short, int, long, float, double 等基本数据类型所占的字节数，并按以下两列对齐格式输出。

#include "iostream.h"

void main()
{
char ch;
short sh;
int in;
long lo;
float fl;
double Do;

int Size;

cout<<"sizeof(char) "<<sizeof(ch)<<endl;
cout<<"sizeof(short) "<<sizeof(sh)<<endl;
cout<<"sizeof(int) "<<sizeof(in)<<endl;
cout<<"sizeof(long) "<<sizeof(lo)<<endl;
cout<<"sizeof(float) "<<sizeof(fl)<<endl;
cout<<"sizeof(double) "<<sizeof(Do)<<endl;
}