结构体自定义指针函数c语言,C语言技巧--在结构体中使用函数例子（定义一个指向函数的指针）...

#include

#include

#include

#define DECLARATION int (*ptr)(int x,int y)

#define DEFINITION(x,y) ptr(x,y)

int sum(int x,int y){

return(x+y);

}

void main()

{

int a,b,c;

typedef struct {

int r;

DECLARATION;

//int (*ptr)(int x,int y);

} mystr;

scanf("%d,%d",&a,&b);

//

//mystr stru;

//stru.ptr=sum;

//c=stru.ptr(a,b);

//printf("a=%d,b=%d,sum=%d/n",a,b,c);

///

typedef mystr *struc;

struc stru;

stru=(struc)malloc(sizeof(mystr));

memset(stru,0,sizeof(mystr));

stru->ptr=sum;

c=stru->DEFINITION(a,b);

//c=stru->ptr(a,b);

printf("a=%d,b=%d,sum=%d/n",a,b,c);

memset(stru,0,sizeof(mystr));

free(stru);

}