2012年 上半年 第三周 C++程序设计 （四）

 任务：声明一个类，对其熟练应用。

#include <iostream>
using namespace std;
class Student
{
public:
 void set_data(int n, char *p, char s);
 void display();
private:
 int num;
 char name[20];
 char sex;

};
void Student::set_data (int n, char *p, char s)
{
 num=n;
 strcpy(name,p);
 sex=s;
}
void Student::display ()
{
 cout << "num: " << num << endl;
 cout << "name: " << name <<endl;
 cout << "sex: " << sex << endl;
}

int main()
{
 Student stu1,stu2;
 stu1.set_data(1,"he",'f');
 stu2.set_data(2,"she",'m');
 stu1.display();
 stu2.display();
 return 0;
}

运行结果为

 

如果void Student::display()写成void display()

结果会出现三个错误

“--------------------Configuration: Cpp1 - Win32 Debug--------------------
Compiling...
Cpp1.cpp
C:\Documents and Settings\user\桌面\程序设计\Cpp1.cpp(14) : error C2146: syntax error : missing ';' before identifier 'set_data'
C:\Documents and Settings\user\桌面\程序设计\Cpp1.cpp(14) : error C2182: 'Student' : illegal use of type 'void'
C:\Documents and Settings\user\桌面\程序设计\Cpp1.cpp(14) : fatal error C1004: unexpected end of file found
Error executing cl.exe.

Cpp1.obj - 3 error(s), 0 warning(s)   ”