arithmetic —
quiz on simple arithmetic
arithmetic 
[o
+x/]
[r
range] 
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 endoffile character.
The options are as follows:


 o
+x/
 By default, arithmetic asks
questions on addition of numbers from 0 to 10, and corresponding
subtraction. By supplying one or more of the characters
+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.


 r
range
 If a range is supplied,
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
range, inclusive. For subtraction and
division, both the required result and the number to divide by or subtract
will be between 0 and range. (Of course,
arithmetic will not ask you to divide by 0.)
The default range is 10.
When you get a problem wrong,
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.
arithmetic cannot be persuaded to tell you the
right answer. You must work it out for yourself.
“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.
bc(1),
dc(1)