《C++primerplus》第4章练习题

注：略过部分题目，修改了题设要求，实现差不多的功能

1.使用字符数组。要求用户输入姓名，等第和年龄，输出其姓名和年龄，等第降一级（即字母高一级）。

#include<iostream>

using namespace std;

int main()
{
	char first_name[15];
	char last_name[15];
	char grade;
	int age;

	cout << "What's your first name?" << endl;
	cin >> first_name;
	cout << "What's your last name?" << endl;
	cin >> last_name;
	cout << "What letter grade do you deserve?" << endl;
	cin >> grade;
	cout << "What's your age?" << endl;
	cin >> age;
	cout << "Name:"<<last_name << "," << first_name << endl;
	cout << "Grade:" << char(grade + 1) << endl;		
	cout << "Age:" << age << endl;

	system("pause");

}

　

2.使用string类；定义一个结构（如盒子）。要求用户输入盒子的材质和宽度，输出盒子的名字和体积。

#include<iostream>
#include<string>
using namespace std;

struct box
{
	string box_material;
	string box_name = "box";

	double width;
};

int main()
{
	box box1;

	cout << "Enter the box's material:" << endl;
	cin >> box1.box_material;
	cout << "Enter the box's width(cm):" << endl;
	cin >> box1.width;
	cout << box1.box_material + box1.box_name << "." << endl;
	cout << "Volume:" << box1.width*box1.width*box1.width << endl;
	
	system("pause");

}