C语言指向函数的指针

#include <iostream>
using namespace std;
int sum = 0;
int m = 0;
void food1(){
cout<<"drink"<<endl;
sum = sum+5;
m++;
}
void food2(){
cout<<"food"<<endl;
sum = sum+5;
m++;
}
int main(){
typedef void (*MenuFood)();//定义一个指向函数的指针类型，名为MenuFood
MenuFood p[] ={food1,food2};
cout<<"1.drink"<<endl;
cout<<"2.food"<<endl;
cout<<"0.exit"<<endl;
int choice;
do{
cin>>choice;
switch (choice)
{
case 1:
p[0]();
break;
case 2:
p[1]();
break;
case 0:
break;
default:
cout<<"Please input right number";
}
}while (choice!=0);
cout<<"sum="<<sum<<endl;
return 0;
}