define 和 sizeof() 函數的大小

#include "stdafx.h"<br />#include <iostream><br />#include <string><br />#include <conio.h><br />using namespace std;<br />#define DOUBLE(x) x+x<br />void Func(char a[100])<br />{<br />cout<<sizeof(a)<<endl;<br />}<br />int main()<br />{<br />int i = 5*DOUBLE(5); // #define 會將運算式展開為 5*5+5 = 30<br />cout<<"i= "<<i<<endl;<br />char a[] = "hello world";<br />char *p = a;<br />cout<<sizeof(a)<<endl;<br />cout<<sizeof(p)<<endl;<br />Func(a);<br />getch();<br />}