---
name: "reversi-demo"
section: "3"
platform: "linux"
package: "libggtl2-dev"
version: "2.1.4-2"
release: "Debian 5.0 (Lenny)"
platforms: ["linux"]
url: "https://new.carta.tech/reversi-demo"
---

# reversi-demo(3)

a self-playing reversi demo using GGTL

## NAME

reversi-demo - a self-playing reversi demo using GGTL

## SYNOPSIS

```
  reversi-demo
  reversi-demo SIZE
  reversi-demo SIZE PLY
  reversi-demo SIZE PLY TRACEPLY
```

## DESCRIPTION

This shows how simple it is to create a self-playing Reversi (aka Othello) program with the GGTL [*reversi*(3)](/reversi/3.md) extension. If you have GGTL installed, a program called `"reversi-demo"` should have been installed with it.

If invoked without arguments (or with only some of the arguments given), the defaults for SIZE, PLY and TRACEPLY are 6, 3, and -1.

## SOURCE

The full source for `"reversi-demo"` is:

```
  #include <stdio.h>
  #include <stdlib.h>
  #include <ggtl/reversi.h>

  int main(int argc, char **argv)
  {
    RState *state;
    GGTL *g;
    int size;
    int ply;
    int trace;

    size = argc > 1 ? atoi(argv[1]) : 6;
    ply = argc > 2 ? atoi(argv[2]) : 3;
    trace = argc > 3 ? atoi(argv[3]) : 1;
    if (size % 2) {
      size++;
    }

    state = reversi_state_new(size);
    g = reversi_init(ggtl_new(), state);
    ggtl_set(g, TYPE, FIXED);

    if (!g && !state) {
      puts("cannot allocate enough memory");
      return EXIT_FAILURE;
    }

    ggtl_set(g, PLY, ply);
    ggtl_set(g, TRACE, trace);
    do {
      reversi_state_draw(state);
      putchar('\n');
      state = ggtl_ai_move(g);
    } while (state);

    if (0 == ggtl_eval(g)) {
      puts("game ended in a draw");
    }
    else {
      state = ggtl_peek_state(g);
      printf("player %d %s\n", state->player,
        0 < ggtl_eval(g) ? "won" : "lost");
    }

    ggtl_free(g);
    return 0;
  }
```

## AUTHOR

Stig Brautaset \<stig@brautaset.org\>

## COPYRIGHT

Copyright (C) 2005 Stig Brautaset

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.