Function pointers

#include <stdio.h>

typedef void func_t(int);

//these two function declarations are equivalent:
void print1(int x);
func_t print2;

func_t *p; //p is a pointer to a function;
void (*q)(int); //equivalent function-pointer declaration

void print(int x){
   printf("%d\n", x);
}

int main(){
   p = &print; //p now points to the "print" function

   //equivalent function calls:
       p(5);
    (*p)(5);
   print(5);
}