c類結構體嵌套函數

//c類結構體嵌套函數
//typdef  void (*pfunc)(int a, int b){retrun;}
/*typedef struct stu{
int a;
int b;
pfunc func;
}*/
//c++中的構造函數和析構函數
//#include<iostream>


//using namespace std;
/*#include<stdio.h>
#include<stdlib.h>
#include<string.h>
class Stu
{
public :
int a;
Stu()
{
//
    printf("Stu::stu ");
}
Stu(int a)
{
       this->a =a;
 printf("Stu::stu *THis->a %d",this->a);  
}
~Stu()
{
        printf("Stu:;stu this->a");
}
void func(int a)//普通函數
{     this->a=a;
         printf("this-a %d",this->a);
}
};
int main()
{
Stu s(110);
s.func(100);
return 0 ;
}*/
//static 
//靜態成員函數：1可以獨立於類對象調用 靜態函數中不能使用this


/*#include<stdio.h>
class Stu{
public:
int a;
static void func()
{
//this->a=a//錯誤
printf("Stu::func\n");
}
};
int main()
{
Stu::func();
Stu s;
s.func();

}*/




/*#include<stdio.h>
#include<stdlib.h>
#include<string.h>




struct stu{
static int a;
};
int stu::a=0;


int main()
{
stu s;
s.a=10;
printf("%d",s.a);

}*/


//const 只有只讀屬性




#include<stdio.h>
#include<stdlib.h>
#include<string.h>
class Stu{
public :
const int a;
     int b;
 Stu():a(100),b(200)
 {
printf("this a %d this b %d",a,b);
 } 
 Stu(int num):a(num),b(200)
 {
printf("this a %d this b %d",a,b);
 }
 void print()
 {
b=300;
printf("this a %d this b %d",a,b);
 }
};




int main()
{
Stu s(100);
    Stu s1;
s1.print();
     return 0;
}