sign.c

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/*
 * This file is part of the Fun programming language.
 * https://fun-lang.xyz/
 *
 * Copyright 2026 Johannes Findeisen <you@hanez.org>
 * Licensed under the terms of the Apache-2.0 license.
 * https://opensource.org/license/apache-2-0
 */


case OP_SIGN: {
 Value v = pop_value(vm);
 int out = 0;
 if (v.type == VAL_INT) {
 out = (v.i > 0) - (v.i < 0);
 } else if (v.type == VAL_FLOAT) {
 if (v.d > 0.0)
 out = 1;
 else if (v.d < 0.0)
 out = -1;
 else
 out = 0;
 } else {
 fprintf(stderr, "Runtime type error: SIGN expects number, got %s\n", value_type_name(v.type));
 exit(1);
 }
 free_value(v);
 push_value(vm, make_int(out));
 break;
}