.\" Copyright (c) 1989 The Regents of the University of California. .\" All rights reserved. .\" .\" This code is derived from software contributed to Berkeley by .\" Eamonn McManus of Trinity College Dublin. .\" .\" Redistribution and use in source and binary forms are permitted provided .\" that: (1) source distributions retain this entire copyright notice and .\" comment, and (2) distributions including binaries display the following .\" acknowledgement: ``This product includes software developed by the .\" University of California, Berkeley and its contributors'' in the .\" documentation or other materials provided with the distribution and in .\" all advertising materials mentioning features or use of this software. .\" Neither the name of the University nor the names of its contributors may .\" be used to endorse or promote products derived from this software without .\" specific prior written permission. .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. .\" .\" @(#)arithmetic.6 6.6 (Berkeley) 6/23/90 .\" .TH ARITHMETIC 6 "June 23, 1990" .UC 4 .SH NAME arithmetic \- quiz on simple arithmetic .SH SYNOPSIS .B arithmetic .B [ \-o +\-x/ .B ] .B [ \-r range .B ] .SH DESCRIPTION .I Arithmetic asks you to solve problems in simple arithmetic. Each question must be answered correctly before going on to the next. After every 20 problems, it prints the score so far and the time taken. You can quit at any time by typing the interrupt or end-of-file character. .PP The options are as follows: .TP \-o By default, .I arithmetic asks questions on addition of numbers from 0 to 10, and corresponding subtraction. By supplying one or more of the characters .BR +\-x/ , you can ask for problems in addition, subtraction, multiplication, and division, respectively. If you give one of these characters more than once, that kind of problem will be asked correspondingly more often. .TP \-r If a .I range is supplied, .I arithmetic selects the numbers in its problems in the following way. For addition and multiplication, the numbers to be added or multiplied are between 0 and .IR range , inclusive. For subtraction and division, both the required result and the number to divide by or subtract will be between 0 and .IR range . (Of course, .I arithmetic will not ask you to divide by 0.) The default .I range is 10. .PP When you get a problem wrong, .I arithmetic will remember the numbers involved, and will tend to select those numbers more often than others, in problems of the same sort. Eventually it will forgive and forget. .PP .I Arithmetic cannot be persuaded to tell you the right answer. You must work it out for yourself. .SH DIAGNOSTICS ``What?'' if you get a question wrong. ``Right!'' if you get it right. ``Please type a number.'' if arithmetic doesn't understand what you typed. .SH "SEE ALSO" bc(1), dc(1)