#include <stdio.h>

int g1(int x);
int g2(int *p);
int g3(int *p);
void foo();

void f1() {
  int i=17;
  int j=g1(i);
  printf("Inside f1: %d %d\n",i,j);  
  // foo();
}
int g1(int x) {
  x = x + 1;
  return x + 1;
}

void foo() {
  printf("Inside foo\n");
}

void f2() {
  int i=17;
  int j=g2(&i);
  printf("Inside f2: %d %d\n",i,j);    
}
int g2(int* p) {
  (*p) = (*p) + 1;
   return (*p) + 1;
}

void f3() {
  int i=17;
  int j=g3(&i);
  // printf("Inside f3: %d %d\n",i,j);    
}
int g3(int* p) {
  int k = *p;
  int *q = &k;
  p = q;
  (*p) = (*q) + 1;
   return (*q) + 1;
}

int main() {
  f1();
  f2();
  f3();
  return 0;
}