#include <stdio.h>
#include <stdlib.h>

void read_self()
{
  FILE *file;
  const char *name = "file_open_close.c";
  char buf[120];

  file = fopen(name, "r");
  if(!file){
    perror(name);
    exit(1);
  }

  fgets(buf, 120, file);
  printf("Read from %s\n%s\n", name, buf);

  fclose(file);
}

void write_to_temp()
{
  FILE *file;
  const char *msg = "Well, this is a surprise...\n";

  printf("Creating temporary file!\n");
  file = fopen("./tmp", "w");
  if(!file){
    perror("tmp");
    exit(1);
  }

  fputs(msg, file);

  fclose(file);
}

int main()
{
  read_self();
  write_to_temp();

  return 0;
}