os161-1.99
 All Data Structures
add.c
00001 /*
00002  * Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009
00003  *      The President and Fellows of Harvard College.
00004  *
00005  * Redistribution and use in source and binary forms, with or without
00006  * modification, are permitted provided that the following conditions
00007  * are met:
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the University nor the names of its contributors
00014  *    may be used to endorse or promote products derived from this software
00015  *    without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
00018  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00019  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00020  * ARE DISCLAIMED.  IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
00021  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00022  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00023  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00024  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00025  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00026  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00027  * SUCH DAMAGE.
00028  */
00029 
00030 /*
00031  * Simple program to add two numbers (given in as arguments). Used to
00032  * test argument passing to child processes.
00033  *
00034  * Intended for the basic system calls assignment; this should work
00035  * once execv() argument handling is implemented.
00036  */
00037 
00038 #include <stdio.h>
00039 #include <stdlib.h>
00040 #include <err.h>
00041 
00042 int
00043 main(int argc, char *argv[])
00044 {
00045         int i, j;
00046 
00047         if (argc != 3) {
00048                 errx(1, "Usage: add num1 num2");
00049         }
00050 
00051         i = atoi(argv[1]);
00052         j = atoi(argv[2]);
00053 
00054         printf("Answer: %d\n", i+j);
00055 
00056         return 0;
00057 }
 All Data Structures