1 #include<iostream>
 2 using namespace std;
 3 
 4 int PrintVal(int i){
 5     cout<<i<<endl;
 6     return 0;
 7 }
 8 
 9 int Add(int i,int j){
10     return i+j;
11 }
12 
13 void Compare(int i,int j){
14     if(i==j)
15         cout<<i<<"=="<<j<<endl;
16     else if(i>j)
17         cout<<i<<">"<<j<<endl;
18     else
19         cout<<i<<"<"<<j<<endl;
20 }
21 typedef int(*pFunc)(int);
22 
23 int main(){
24     pFunc p1 = PrintVal;
25     int (*p2)(int,int);
26     p1(7);
27     p1 = &PrintVal;
28     (*p1)(8);
29     p2 = Add;
30     cout<<p2(4,5)<<endl;
31 
32     p2 = reinterpret_cast<int(*)(int,int)>(Compare);//进行强转
33 
34     p2(4,5);
35 }