#include <stdio.h>
#include <stdlib.h>
int fun1()
{
  printf("this is fun1 call\n");
  return 1;
}
void fun2(int k, char c)
{
  printf("this is fun2 call:%d %c\n", k, c);
}
int main()
{
  int (*pfun1)() = NULL;
  void (*pfun2)(int, char) = NULL;
  int a,b;
  pfun1 = fun1; //第一種賦值方法
  a = pfun1(); //第一種調(diào)用方法（推薦）
  printf("%d\n",a);
  b = (*pfun1)();//第二種調(diào)用方法
  printf("%d\n",b);
  pfun2 = &fun2;//第二種賦值方法（推薦，因?yàn)楹推渌麛?shù)據(jù)指針賦值方法一致）
  pfun2(1,'a');
  (*pfun2)(2,'b');
  return 0;
}

#include <stdio.h>
#include <stdlib.h>
void fun(int k, char c)
{
  printf("this is fun2 call:%d %c\n", k, c);
}
void fun1(void (*pfun)(int, char), int a, char c)
{
  pfun(a, c);
}
int main()
{
  fun1(fun, 1, 'a');
  return 0;
}
// c++ 的形式差不多

// c 形式
#include <stdio.h>
#include <stdlib.h>
void fun(int k, char c)
{
  printf("this is fun2 call:%d %c\n", k, c);
}
//fun1 函數(shù)的參數(shù)為double，返回值為函數(shù)指針void(*)(int, char)
void (*fun1(double d))(int, char)
{
  printf("%f\n",d);
  return fun;
}
int main()
{
  void (*p)(int, char) = fun1(3.33);
  p(1, 'a');
  return 0;
}
//c++ 形式
#include <iostream>
using namespace std;
class test
{
public:
  int fun(int a, char c)
  {
    cout<<"this is fun call:"<<a<<" "<<c<<endl;
    return a;
  }
};
class test2
{
  public:
  // test2 的成員函數(shù)fun1,參數(shù)是double，
  //返回值是test的成員函數(shù)指針int(test::*)(int, char)
  int (test::*fun1(double d))(int, char)
  {
    cout<<d<<endl;
    return &test::fun;
  }
};
int main()
{
  test mytest;
  test2 mytest2;
  int (test::*p)(int, char) = mytest2.fun1(3.33);
  (mytest.*p)(1, 'a');
  return 0;
}

#include <stdio.h>
#include <stdlib.h>
float add(float a,float b){return a+b;}
float minu(float a,float b){return a-b;}
int main()
{
  //定義一個(gè)函數(shù)指針數(shù)組，大小為2
  //里面存放float (*)(float, float)類型的指針
  float (*pfunArry[2])(float, float) = {&add, &minu};
  double k = pfunArry[0](3.33,2.22);// 調(diào)用
  printf("%f\n", k);
  k = pfunArry[1](3.33,2.22);
  printf("%f\n", k);
  return 0;
}
//c++ 可類比

#include <stdio.h>
#include <stdlib.h>
float add(float a,float b)
{
  printf("%f\n",a+b);
  return a+b;
}
float minu(float a,float b)
{
  printf("%f\n",a-b);
  return a-b;
}
//用pfunType 來表示float(*)(float, float)
typedef float(*pfunType)(float, float);
int main()
{
  pfunType p = &add;//定義函數(shù)指針變量
  p(3.33, 2.22);
  pfunType parry[2] = {&add, &minu};//定義函數(shù)指針數(shù)組
  parry[1](3.33, 2.22);
  //函數(shù)指針作為參數(shù)可以定義為：void fun(pfunType p)
  //函數(shù)指針作為返回值可以定義為：pfunType fun();
  return 0;
}
//c++ 可類比