/*
 * Main program
 * Reads and stores variables.
 * Invokes graph operations to build and colour the graph of variables.
 */

#include <stdio.h>
#include <stdlib.h>
#include "token.h"
#include "symbol.h"
#include "graph.h"

int main()
{
    struct token t;
    GRAPH g;
    int stmt;

    token_init(stdin);
    stmt = 0;
    while (t = get_next_token(), t.type != EOF) {
        switch (t.type) {
        case TOKEN_IDENT:
            symbol_set_seen(t.symvalue, stmt);
            break;
        case ';':
            stmt++;
            break;
        /* ignore all else */
        }
    }

    g = new_graph ...

FILL IN STUFF HERE

    print_graph(g);

    return 0;
}


Here is an example of using the SYMBOL_ITER data type to add vertices for all
of the symbols:

    SYMBOL_ITER i = new_symbol_iter();
    SYMBOL x;

    for (x = first_symbol(i); x; x = next_symbol(i))
        add_vertex(g, symbol_getname(x));