forking and piping in C

fork.c

#include <stdio.h>
#include <unistd.h>

int main()
{
  pid_t pid = fork();
  if(pid == -1)
    fprintf(stderr,"There was an error\n");
  else if(pid == 0)
    printf("I am the child. I do not know my pid.\n");
  else
    printf("I am the parent. The child's pid is %d.\n",pid);

  return 0;
}

pipe.c

#include <stdio.h>
#include <string.h>
#include <unistd.h>

int main()
{
  int pip[2];

  if(pipe(pip) == -1)
  {
    fprintf(stderr,"There was an error establishing the pipe.\n");
    return 1;
  }

  pid_t pid = fork();
  if(pid == -1)
  {
    fprintf(stderr,"There was an error forking.\n");
    return 1;
  }

  char buffer[80];

  if(pid == 0)
  {
    char* msg = "This is a message from the child: Hello!";
    write(pip[1],msg,strlen(msg)+1);
  }
  else
  {
    read(pip[0],buffer,sizeof(buffer));
    printf("The parent received this string from the child: \"%s\"\n",buffer);
  }
  return 0;
}