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# Commands Reference, Volume 1

## arithmetic Command

### Purpose

Tests arithmetic skills.

### Syntax

arithmetic [ + ] [ - ]
[ x ] [ / ] [ Range ]

### Description

The arithmetic command displays
simple arithmetic problems and waits for you to enter an answer. If your answer
is correct, the program displays `Right!` and presents
a new problem. If your answer is wrong, it displays `What?` and waits for another answer. After a set of 20 problems, the arithmetic command displays the number of correct and incorrect
responses and the time required to answer.

The arithmetic command does not
give the correct answers to the problems it displays. It provides practice
rather than instruction in performing arithmetic calculations.

To quit the game, press the Interrupt (Ctrl-C) key
sequence; the arithmetic command displays the final
game statistics and exits.

### Flags

The optional flags modify the action of the arithmetic command. These flags are:

+ |
Specifies addition problems. |

- |
Specifies subtraction problems. |

x |
Specifies multiplication problems. |

/ |
Specifies division problems. |

Range |
A decimal number that specifies the permissible range of numbers.
This range goes up to and includes 99. For addition and multiplication problems,
the range applies to all numbers (except answers). For subtraction and division
problems, the range applies only to the answers. At the start of the game,
all numbers within this range are equally likely to appear. If you make a
mistake, the numbers in the problem you missed become more likely to reappear. |

If you do not select any flags, the arithmetic command selects addition and subtraction problems and a default
range of 10. If you give more than one problem specifier (+, - ,x, /), the program mixes the specified types of problems in random order.

### Examples

- To drill on addition and subtraction of integers
from 0 to 10:
arithmetic

- To drill on addition, multiplication, and division
of integers from 0 to 50:
arithmetic +x/ 50

### File

/usr/games |
Location of the system's games. |

### Related Information

The back
command, bj command, craps command, fish command, fortune
command, hangman command, moo command, number command, quiz command, ttt
command, turnoff command, turnon command, wump command.

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