#include <iostream.h>
class student
{
private:
    int id;
    float chinese,english,math;
public:
    student();
    student(int m_id,float m_chinese,float m_english,float m_math);
    void show();
};
student::student()
{
    id=0;
    chinese=english=math=0;
}
student(int m_id,float m_chinese,float m_english,float m_math)
{
    id=m_id;
    chinese=m_chinese;
    english=m_english;
    math=m_math;
}
student::show()
{
    cout<<id<<endl;
    cout<<chinese<<endl;
    cout<<english<<endl;
    cout<<math<<endl;
}
int main()
{
    student s1;
    student s2(1,60,70,80);
    s1.show();
    s2.show();
    return 0;
}




与这个有什么区别（这个是正确的）：
#include <iostream.h>
class student
{
private:
    int id;
    float chinese,english,math;
public:
   
    student()
    {
        id=1;
        chinese=100;
        english=100;
        math=100;
    }
    void show();
};

void student::show()
{
    cout<<id<<endl;
    cout<<chinese<<endl;
    cout<<english<<endl;
    cout<<math<<endl;
}
int main()
{
    class student s1,s2;
    s1.show();
    s2.show();
    return 0;
}
是因为构造函数不能再类外初始化吗？

[ 本帖最后由 ku_klox 于 2010-6-20 21:46 编辑 ]

#include <iostream.h>

class student
{
private:
    int id;
    float chinese,english,math;
public:
    student();
    student(int m_id,float m_chinese,float m_english,float m_math);
    void show();
};

student::student()
{
    id=0;
    chinese=english=math=0;
}
student::student(int m_id,float m_chinese,float m_english,float m_math)//错误出在这一行，自己对照看，少了类名的限定
{
    id=m_id;
    chinese=m_chinese;
    english=m_english;
    math=m_math;
}
void student::show()//这行也有错误，函数没有写返回值类型
{
    cout<<id<<endl;
    cout<<chinese<<endl;
    cout<<english<<endl;
    cout<<math<<endl;
}
int main()
{
    student s1;
    student s2(1,60,70,80);
    s1.show();
    s2.show();
    return 0;
}

谢谢指教~~！！