查看“︁Cpp class exercise 3”︁的源代码

{{DISPLAYTITLE: “C++ 编程入门班” 练习三}}

== 本课学习目标 ==
* 完成所有基本程序结构（顺序、分支、循环）语句的学习
** switch语句
** 循环结构中break和continue语句的使用
* 复习巩固各程序结构的语句
** 进一步熟悉同类结构中不同语句之间的区别（例如switch语句和 if语句、if-else语句的区别，while循环和do-while循环的区别）
** 结构的嵌套
** 使用流程图


== 练习说明 ==

使用最新版本的Chrome 浏览器可以避免把行号一起复制

如果使用其它浏览器，复制后带上了行号，可以按住 Alt 竖选文本，快速删除行号


== 预习部分 ==

=== switch语句 ===
<syntaxhighlight lang="C++" line>
#include <iostream>
using namespace std;

int main()
{	
	int weekday = 0; 
	cin >> weekday; //接收用户输入	
		
	switch(weekday)
	{
		case 1: 
			cout << "星期一" <<endl; 
			break; 
		case 2: 
			cout << "星期二" <<endl;
			break;
		case 3: 
			cout << "星期三" <<endl;
			break;
		case 4: 
			cout << "星期四" <<endl;
			break;
		case 5: 
			cout << "星期五" <<endl;
			break;
		case 6: 
			cout << "星期六" <<endl;
			break;
		case 7: 
			cout << "星期天" <<endl;
			break;
		default:
			cout << "请输入正确的数字！" <<endl; 
	}		
    
	return 0;
	
}
</syntaxhighlight>



<syntaxhighlight lang="C++" line>
#include <iostream>
using namespace std;

int main()
{	
	int weekday = 0; 
	cin >> weekday; //接收用户输入	
	
	if(weekday == 1)
		cout << "星期一" <<endl; 
	if(weekday == 2)
		cout << "星期二" <<endl; 
	if(weekday == 3)
		cout << "星期三" <<endl; 
	if(weekday == 4)
		cout << "星期四" <<endl; 		
	if(weekday == 5)
		cout << "星期五" <<endl; 
	if(weekday == 6)
		cout << "星期六" <<endl; 		
	if(weekday == 7)
		cout << "星期天" <<endl; 		
	if(weekday < 1 || weekday > 7)
		cout << "请输入正确的数字！" <<endl;     
	return 0;
	
}
</syntaxhighlight>

<syntaxhighlight lang="C++" line>
#include <iostream>
using namespace std;

int main()
{	
	int weekday = 0; 
	cin >> weekday; //接收用户输入	
	
	if(weekday == 1)
		cout << "星期一" <<endl; 
	else if(weekday == 2)
			cout << "星期二" <<endl; 
		else if(weekday == 3)
				cout << "星期三" <<endl; 
			else if(weekday == 4)
					cout << "星期四" <<endl; 		
				else if(weekday == 5)
						cout << "星期五" <<endl; 
					else if(weekday == 6)
							cout << "星期六" <<endl; 		
						else if(weekday == 7)
								cout << "星期天" <<endl; 		
							else
								cout << "请输入正确的数字！" <<endl;    
			 
	return 0;
	
}
</syntaxhighlight>

== 主要内容 ==
swicth

多重 if else 

分支结构比较

调试器
跟踪运行情况
在运行中修改变量值

数组

结构体

文件保存、读取
保存口算题成绩记录

扩展：身高体重数据、图书借阅等