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int main(int argc, char *argv[]) {
  char *str = NULL;
  if (argc == 2) {
    str = malloc(strlen(argv[1])+1);
    if (str == NULL) {
      /* Handle Allocation Error */
    }
    strcpy(str,argv[1]);
  }
  else {
    str = "usage: $>a.exe [string]";
    printf("%s\n", str);
  }
  /* ... */
  free(str);
  return 0;
}

int main(int argc, char *argv[]) {
  char *str = NULL;
  if (argc == 2) {
    str = malloc(strlen(argv[1])+1);
    if (str == NULL) {
      /* Handle Allocation Error */
    }
    strcpy(str, argv[1]);
  }
  else {
    printf("usage: $>a.exe [string]\n");
    return 1;
  }
  /* ... */
  free(str);
  return 0;
}