C++primer 第二章

原创于 2016-09-03 14:58:19 发布 · 792 阅读

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本文提供两个C++程序实例：第一个程序演示了如何使用C++标准库进行简单输出；第二个程序展示了如何读取并处理图书销售数据，包括从用户输入中获取图书编号、售出数量及价格，并计算总收入。

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2.8

#include <iostream>
using namespace std;

int main()
{
	cout << "2\12" << endl;
	cout << "2\t\x4d\n" << endl;
}

2.41

#include <iostream>
#include <string>
#include "Sales_data.h"
using namespace std;

int main()
{
	bool sign = true;

	Sales_data q_20;
	double price;

	while (sign) {
		cin >> q_20.bookNo >> q_20.units_sold >> price;
		q_20.revenue = q_20.units_sold * price;
		cout << q_20.bookNo << " " << q_20.units_sold << " " << q_20.revenue << endl;
		cin >> sign;
	}

	Sales_data q_21_1, q_21_2;

	cin >> q_21_1.bookNo >> q_21_1.units_sold >> price;
	q_21_1.revenue = price*q_21_1.units_sold;
	cin >> q_21_2.bookNo >> q_21_2.units_sold >> price;
	q_21_2.revenue = price*q_21_2.units_sold;
	if (q_21_1.bookNo == q_21_2.bookNo) {
		cout << q_21_1.bookNo << " " 
			<< q_21_1.units_sold + q_21_2.units_sold << " " 
			<< q_21_1.revenue + q_21_2.revenue << endl;
	}
	else {
		cout << "Data must refer to same bookNo" << endl;
	}


}