1 /* Example of a Variadic Function
2 Copyright (C) 1991-2022 Free Software Foundation, Inc.
3
4 This program is free software; you can redistribute it and/or
5 modify it under the terms of the GNU General Public License
6 as published by the Free Software Foundation; either version 2
7 of the License, or (at your option) any later version.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, see <https://www.gnu.org/licenses/>.
16 */
17
18 #include <stdarg.h>
19 #include <stdio.h>
20
21 int
add_em_up(int count,...)22 add_em_up (int count,...)
23 {
24 va_list ap;
25 int i, sum;
26
27 va_start (ap, count); /* Initialize the argument list. */
28
29 sum = 0;
30 for (i = 0; i < count; i++)
31 sum += va_arg (ap, int); /* Get the next argument value. */
32
33 va_end (ap); /* Clean up. */
34 return sum;
35 }
36
37 int
main(void)38 main (void)
39 {
40 /* This call prints 16. */
41 printf ("%d\n", add_em_up (3, 5, 5, 6));
42
43 /* This call prints 55. */
44 printf ("%d\n", add_em_up (10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10));
45
46 return 0;
47 }
48