//菜單顯示
void menushow()
{
	cout<<"\n\t*******************頁式管理*********************\n";
	cout<<"\t\t\t1.添加作業"<<endl;
	cout<<"\t\t\t2.查看作業信息"<<endl;
	cout<<"\t\t\t3.系統開始運行"<<endl;
	cout<<"\t\t\t4.主存運行情況"<<endl;
	cout<<"\t\t\t5.回收內存"<<endl;
	cout<<"\t\t\t6.退出"<<endl;
	cout<<"\t**************************************************\n";
	cout<<"\t請你選擇:";
}