第五版第一章部分源码

1.4.4 统计输入中相同的数出现的次数

#include<iostream>
using namespace std;
int main()
{
	int currVal = 0; 
	int  val = 0;
	if (cin >> currVal)
	{
		int cnt = 1;
		while (cin >> val)
		{
			if (val == currVal)
			{
				++cnt;
			}
			else
			{
				cout<< currVal << "occurs"<< cnt << "times" <<endl;
				currVal = val;
				cnt = 1;
			}
		}

		cout << currVal << "occurs" << cnt << "times" <<endl;

	}
	return 0;
}

1..5.2读取两个相同的salse_item对象输出他们的和

#include <iostream>
#include "Salse_item.h"
int main()
{
	Sales_item item1, item2;
	std::cin >> item1 >> item2;
	//首先检查item1与item2是否表示相同的书
	if (item1.isbn() == item2.isbn())
	{
		std::cout<< item1 + item2 << std::endl;
		return 0;
	}
	else
	{
		std::cerr << "Data must refer to same ISBN" << std::endl;
		return -1;
	}
}