// ------------------------------
// First include all header files
#include <stdio.h>


// ------------------------------
// Second, declare your global variables
// Although it is better to avoid them
int   global1 = 1000;
char  global2[] = "Hello World!";


// ------------------------------
// Third declare your functions
// Use prototypes if you need to use a function before declaring it
void my_function1(char c); // This is a prototype
void my_function2(int *i);  // This is a prototype

// ------------------------------
void my_function1(char c) {

  c = 'a';
  printf("my_function1: c is %c\n", c);
  printf("my_function1: global1 %d, global2 %s\n", global1, global2);

}

void my_function2(int *i) {  

  int regular_int = 1;
  static int static_int = 1;

  printf("regular_int: %d static_int: %d\n", regular_int, static_int);
  regular_int++;
  static_int++;

  *i = -2;
  printf("my_fuction2: i is %d\n", *i);
  printf("my_function2: global1 %d, global2 %s\n", global1, global2);

}


// The main function usually goes at the end
int main() {

  char c = 's';
  my_function1(c);
  printf("main: c is %c\n\n", c);

  int i = 3;

  printf("First invocation of my_function2\n");
  my_function2(&i);

  printf("\nSecond invocation of my_function2\n");
  my_function2(&i);

  printf("main: i is %d\n", i);
  
  return 0;

}