Here is the code we wrote today:

/*
 * to compile and run:
 *    gcc -Wall -std=gnu99 -o hello hello.c
 *    ./hello
 */

#include <stdio.h>

int printDots();

int main() {
  printf("Hello World!\n");  //print message

  int x = 20;
  double y = 3.14;

  if(x < 10)
    printf("It's less\n");
  printDots();
  while(x > 0) {
    printf("%x %d%%\n", x, x);
    x--;
  }
  printf("\n");

  int david[10];
  for(int i=0; i < 10; i++)
    david[i] = 0;

  david[3] = david[4];
}

int printDots() {
  for(int i=0; i < 10; i++)
    printf(".");
  printf("\n");
  return 42;
}