函數指針的返回值是指針數組，數組裏放的是int

函數指針的返回值是指針數組，數組裏放的是int指針

#include <stdio.h>
#include <stdlib.h>

void fun(int a){
  printf("fun:%d\n", a);
}

void fun1(void (*f)(int),int a){
  f(a);
}

int gun(int a){
  printf("gun:%d\n", a);
}

int gun1(int a, int(*f)(int)){
  printf("gun1:%d\n", a);
}
int (*hun(int
 
 a))[]{
  int (*p)[3] = (int(*)[3])malloc(sizeof(int[3]) * 2);
  (*p)[0] = a+1;
  //p[0][0] = a+1;
  p[0][1] = a+2;
  p[0][2] = a+3;
  (*(p+1))[0] = a+11;
  //下面寫法是錯誤的，p+1兩側必須加括號
  //(*p+1)[0] = a+11;
  p[1][1] = a+22;
  (*(p+1))[2] = a+33;

  return p;
}
int *(*hun1(int a))[]{
  int* (*p)[3] = (int*(*)[3])malloc(sizeof
 
(int*[3]) * 2);
  int *w1 = (int*)malloc(sizeof(int));
  *w1 = 10+a;
  int *w2 = (int*)malloc(sizeof(int));
  *w2 = 20+a;
  int *w3 = (int*)malloc(sizeof(int));
  *w3 = 30+a;
  int *w4 = (int*)malloc(sizeof(int));
  *w4 = 40+a;
  int *w5 = (int*)malloc(sizeof(int));
  *w5 = 50+a;
  int *w6 = (int*)malloc(sizeof
 
(int));
  *w6 = 60+a;
  (*p)[0] = w1;
  p[0][1] = w2;
  p[0][2] = w3;
  (*(p+1))[0] = w4;
  p[1][1] = w5;
  (*(p+1))[2] = w6;
  
  return p;
}
int main(){
  //指針數組，數組裏是函數指針，指向的函數沒有返回值，1個int參數
  void (*a[1])(int);
  a[0] = &fun;
  (*a[0])(1);
  //指針數組，數組裏是函數指針，指向的函數沒有返回值，2個參數。第一個參數是函數指針，指向的函數沒有返回值，1個int參數；第二個參數是int
  void (*b[1])(void(*)(int),int);
  b[0] = &fun1;
  (*b[0])(a[0],10);
  
  //指針數組，數組裏是函數指針，指向的函數的返回值是int，1個int參數
  int (*c[1])(int);
  c[0] = &gun;
  (*c[0])(3);
  //指針數組，數組裏是函數指針，指向的函數的返回值是int，2個參數。第一個參數是int;第二個參數是函數指針，指向的函數的返回值是int，1個int參數。
  int(*d[1])(int, int(*)(int));
  d[0] = &gun1;
  (*d[0])(120,c[0]);

  //指針數組，數組裏是函數指針，指向的函數的返回值是數組指針，數組裏是int，1個int參數。  
  int (*(*e[1])(int))[];
  e[0] = &hun;
  int (*p)[3] = (*e[0])(3);
  for(int i = 0; i < 2; ++i){
    for(int j = 0; j < 3; ++j){
      printf("%d ", p[i][j]);
    }
    printf("\n");
  }
  free(p);

  //指針數組，數組裏是函數指針，指向的函數的返回值是數組指針，數組裏是int指針，1個int參數。  
  int *(*(*g[1])(int))[];
  g[0] = &hun1;
  int* (*p1)[3] = (*g[0])(10);
  for(int i = 0; i < 2; ++i){
    for(int j = 0; j < 3; ++j){
      printf("%d ", *p1[i][j]);
    }
    printf("\n");
  }
  free(p1);

}

函數指針的返回值是指針數組，數組裏放的是int；函數指針的返回值是指針數組，數組裏放的是int指針