/**************************************************
?*?Essential?C++?--?Stanley?Lippman
?*?Addison-Wesley?
?*?ISBN?0-201-48518-4
?*?homepage:?www.objectwrite.com
?*?email:?slippman@objectwrite.com
?*************************************************/

#include?
#include?
using?namespace?std;

int?ex1_5_string（）
{
????string?user_name;

????cout?<????cin?>>?user_name;?

????switch?（?user_name.size（）?）{
????????case?0:
				cout?<?????????????????<				break;

		??case?1:
				cout?<?????????????????<????????????break;

			?default:
		??????//?any?string?longer?than?1?character
				cout?<?????????????????<				break;
		}
		return?0;
}

#include?
#include?
#include?
using?namespace?std;

int?ex1_5_cstyle（）
{
????//?must?allocate?a?fixed?size
	?const?int?nm_size?=?128;
????char?user_name[?nm_size?];?

????cout?<????cin?>>?setw（?nm_size?）?>>?user_name;?

????switch?（?strlen（?user_name?））
????{?
			//?case?labels?the?same?for?0?1?
			case?127:
				//?maybe?string?was?truncated?by?setw（）
				cout?<					?<					?<					?//?no?break?--?we?fall?through?...
?			default:
		????????//?the?127?case?drops?through?to?here?--?no?break
				cout?<?????????????????????<				break;
	}
	return?0;
}

#include?
#include?
using?namespace?std;

void?ex1_6_vector（）?
{
????vector?ivec;
????int?ival;

????while?（?cin?>>?ival?）?
????????????ivec.push_back（?ival?）;

????//?we?could?have?calculated?the?sum?as?we?entered?the
????//?values?but?the?idea?is?to?iterate?over?the?vector?...
	int?sum?=?0;
????for?（?int?ix?=?0;?ix?	{
		??cout?<??????????sum?+=?ivec[?ix?];?}

????int?average?=?sum?/?ivec.size（）;
????cout?<?????????<?????????<}

void?ex1_6_array（）?
{
????const?int?arr_size?=?128;
	int?ia[?arr_size?];
????int?ival?icnt?=?0;

????while?（?cin?>>?ival?&&?icnt?????????????ia[?icnt++?]?=?ival;
???????????
????//?icnt?is?1?greater?than?number?of?elements!
	int?sum?=?0;
????for?（?int?ix?=?0;?ix???????????sum?+=?ia[?ix?];

????int?average?=?sum?/?icnt;
????cout?<		?<?????????<?????????<}

#include?
#include?

void?ex1_xtra1（）
{
	vector?sp_vec;
	string?st;

	cout?<