1.\" $NetBSD: arithmetic.6,v 1.9 2002/09/26 18:31:58 wiz 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. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the University of 20.\" California, Berkeley and its contributors. 21.\" 4. Neither the name of the University nor the names of its contributors 22.\" may be used to endorse or promote products derived from this software 23.\" without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35.\" SUCH DAMAGE. 36.\" 37.\" @(#)arithmetic.6 8.1 (Berkeley) 5/31/93 38.\" 39.Dd May 31, 1993 40.Dt ARITHMETIC 6 41.Os 42.Sh NAME 43.Nm arithmetic 44.Nd quiz on simple arithmetic 45.Sh SYNOPSIS 46.Nm 47.Op Fl o Ar +\-x/ 48.Op Fl r Ar range 49.Sh DESCRIPTION 50.Nm 51asks you to solve problems in simple arithmetic. 52Each question must be answered correctly before going on to the next. 53After every 20 problems, it prints the score so far and the time taken. 54You can quit at any time by typing the interrupt or end-of-file character. 55.Pp 56The options are as follows: 57.Bl -tag -width indent 58.It Fl o 59By default, 60.Nm 61asks questions on addition of numbers from 0 to 10, and corresponding 62subtraction. 63By supplying one or more of the characters 64.Ar +\-x/ , 65you can ask for problems in addition, subtraction, multiplication, and 66division, respectively. 67If you give one of these characters more than once, that kind of problem 68will be asked correspondingly more often. 69.It Fl r 70If a 71.Ar range 72is supplied, 73.Nm 74selects the numbers in its problems in the following way. 75For addition and multiplication, the numbers to be added or multiplied 76are between 0 and 77.Ar range , 78inclusive. 79For subtraction and division, both the required result and the number to 80divide by or subtract will be between 0 and 81.Ar range . 82(Of course, 83.Nm 84will not ask you to divide by 0.) 85The default 86.I range 87is 10. 88.El 89.Pp 90When you get a problem wrong, 91.Nm 92will remember the numbers involved, and will tend to select those numbers 93more often than others, in problems of the same sort. 94Eventually it will forgive and forget. 95.Pp 96.Nm 97cannot be persuaded to tell you the right answer. 98You must work it out for yourself. 99.Sh DIAGNOSTICS 100.Dq What? 101if you get a question wrong. 102.Dq Right! 103if you get it right. 104.Dq Please type a number. 105if arithmetic doesn't understand what you typed. 106.Sh SEE ALSO 107.Xr bc 1 , 108.Xr dc 1 109