1.\" $OpenBSD: arithmetic.6,v 1.11 2007/05/31 19:19:16 jmc Exp $ 2.\" 3.\" Copyright (c) 1989, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" Eamonn McManus of Trinity College Dublin. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. Neither the name of the University nor the names of its contributors 18.\" may be used to endorse or promote products derived from this software 19.\" without specific prior written permission. 20.\" 21.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31.\" SUCH DAMAGE. 32.\" 33.\" @(#)arithmetic.6 8.1 (Berkeley) 5/31/93 34.\" 35.Dd $Mdocdate: May 31 2007 $ 36.Dt ARITHMETIC 6 37.Os 38.Sh NAME 39.Nm arithmetic 40.Nd quiz on simple arithmetic 41.Sh SYNOPSIS 42.Nm arithmetic 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 indent 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.) 81The default 82.Ar range 83is 10. 84.El 85.Pp 86When you get a problem wrong, 87.Nm 88will remember the numbers involved, and will tend to select those numbers 89more often than others, in problems of the same sort. 90Eventually it will forgive and forget. 91.Pp 92.Nm 93cannot be persuaded to tell you the right answer. 94You must work it out for yourself. 95.Sh DIAGNOSTICS 96.Dq What? 97if you get a question wrong. 98.Dq Right! 99if you get it right. 100.Dq Please type a number. 101if 102.Nm 103doesn't understand what you typed. 104.Sh SEE ALSO 105.Xr bc 1 , 106.Xr dc 1 107