C-[之函数指针]

指向函数的指针申明格式

类型 (*变量名)();

指向函数的指针 案例1.1

int component(int x,int y);

int main(int argc, const char * argv[])
{
    int (*pointer)(),sum;
    
    pointer = component;
    
    sum = (*pointer)(3,4);
 
    return 0;
}


int component(int x,int y)
{
    return  x + y;
}

把函数的声明当做参数传递 案例1.2

int component(int(*pointer)(),int x,int y);

int max(int,int);

//主函数入口点
int main(int argc, const char * argv[])
{
    int (*pointer)(),sum;
    int (*p)();
    
    pointer = component;
    
    sum = (*pointer)(p=max,3,4);
    
    printf("%d\n",sum);
    
    return 0;
}

int max(int x,int y)
{
    return x+y;
}


int component(int(*pointer)(),int x,int y)
{
    return (*pointer)(x,y);
}