1.\" Copyright (c) 1989, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" Eamonn McManus of Trinity College Dublin. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)arithmetic.6 8.1 (Berkeley) 5/31/93 32.\" $FreeBSD: src/games/arithmetic/arithmetic.6,v 1.3 1999/08/27 23:28:52 peter Exp $ 33.\" $DragonFly: src/games/arithmetic/arithmetic.6,v 1.4 2007/10/20 17:56:46 swildner Exp $ 34.\" 35.Dd May 31, 1993 36.Dt ARITHMETIC 6 37.Os 38.Sh NAME 39.Nm arithmetic 40.Nd quiz on simple arithmetic 41.Sh SYNOPSIS 42.Nm 43.Op Fl o Ar +-x/ 44.Op Fl r Ar range 45.Sh DESCRIPTION 46.Nm 47asks you to solve problems in simple arithmetic. 48Each question must be answered correctly before going on to the next. 49After every 20 problems, it prints the score so far and the time taken. 50You can quit at any time by typing the interrupt or end-of-file character. 51.Pp 52The options are as follows: 53.Bl -tag -width ".Fl r Ar range" 54.It Fl o Ar +-x/ 55By default, 56.Nm 57asks questions on addition of numbers from 0 to 10, and corresponding 58subtraction. 59By supplying one or more of the characters 60.Ar +-x/ , 61you can ask for problems in addition, subtraction, multiplication, and 62division, respectively. 63If you give one of these characters more than once, that kind of problem 64will be asked correspondingly more often. 65.It Fl r Ar range 66If a 67.Ar range 68is supplied, 69.Nm 70selects the numbers in its problems in the following way. 71For addition and multiplication, the numbers to be added or multiplied 72are between 0 and 73.Ar range , 74inclusive. 75For subtraction and division, both the required result and the number to 76divide by or subtract will be between 0 and 77.Ar range . 78(Of course, 79.Nm 80will not ask you to divide by 0.) The default 81.Ar range 82is 10. 83.El 84.Pp 85When you get a problem wrong, 86.Nm 87will remember the numbers involved, and will tend to select those numbers 88more often than others, in problems of the same sort. 89Eventually it will forgive and forget. 90.Pp 91.Nm 92cannot be persuaded to tell you the right answer. 93You must work it out for yourself. 94.Sh DIAGNOSTICS 95.Bl -diag 96.It "What?" 97if you get a question wrong. 98.It "Right!" 99if you get it right. 100.It "Please type a number." 101if 102.Nm 103doesn't understand what you typed. 104.El 105.Sh SEE ALSO 106.Xr bc 1 , 107.Xr dc 1 108