ex2-2.cpp

来自「嵌入式程序设计的十个实例的源代码。欢迎大家下载」· C++ 代码 · 共 22 行

#include <iostream>
using namespace  std;
void main()
{
	unsigned short int us1=-21,us2=-10;
	short int si1=-21,si2=-10;
	unsigned int ui;
	int i;
	ui=us1*us2;
	cout<<ui<<endl;
	i=*((int*)&ui);
	cout<<i<<endl;
	ui=*((unsigned int*)&i);
	cout<<ui<<endl;
	if(si1<0)
		ui-=((*(unsigned short *)&si2&(~(1L<<31)))<<16);
	if(si2<0)
		ui-=((*(unsigned short *)&si1&(~(1L<<31)))<<16);
	cout<<ui<<endl;
	i=*((int*)&ui);
	cout<<i<<endl;
}