#include <iostream>
using namespace std;
double test(int);
void extemp(int a, double (*test2)(int));
int main(int argc, const char * argv[]) {
extemp(1, test);
return 0;
}
double test(int a)
{
return a+20;
}
void extemp(int a, double (*test2)(int))
{
double d = (*test2)(a);
}