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)