JPS54100632A - Miniature electronic computer - Google Patents
Miniature electronic computerInfo
- Publication number
- JPS54100632A JPS54100632A JP759278A JP759278A JPS54100632A JP S54100632 A JPS54100632 A JP S54100632A JP 759278 A JP759278 A JP 759278A JP 759278 A JP759278 A JP 759278A JP S54100632 A JPS54100632 A JP S54100632A
- Authority
- JP
- Japan
- Prior art keywords
- arithmetic
- register
- permutation
- perform
- overflow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Calculators And Similar Devices (AREA)
- Complex Calculations (AREA)
Abstract
PURPOSE: To make it possible to compute all permutation arithmetic of result numbers which can be displayed, only by making use of factorial arithmetic and also by adding a simple discriminating method.
CONSTITUTION: To perform permutation arithmetic nPr, operating numeral keys and an arithmetic indication key sets numerals (n) and (r) and a permutation arithmetic code to registers X, Y and F, and (n-r) is calculated and held in register A. When the contents of register X, namely, (n) is confirmed to be an integer, "1" is set to register Y. In case of the arithmetic of (n!), step SE discriminates whether or not the arithmetic becomes impossible due to the overflow of the arithmetic becomes impossible due to the overflow of the arithmetic register; when the arithmetic fo (n!) can be done, steps SF and SH perform the arithmetic of n!/(n-r)!. If the arithmetic of (n!) is impossible, steps SG, SI, SJ, and SK perform the arithmetic of n(n-1).(n-2)... (n-r+1).
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP759278A JPS54100632A (en) | 1978-01-26 | 1978-01-26 | Miniature electronic computer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP759278A JPS54100632A (en) | 1978-01-26 | 1978-01-26 | Miniature electronic computer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54100632A true JPS54100632A (en) | 1979-08-08 |
Family
ID=11670068
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP759278A Pending JPS54100632A (en) | 1978-01-26 | 1978-01-26 | Miniature electronic computer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54100632A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61192360U (en) * | 1985-05-22 | 1986-11-29 |
-
1978
- 1978-01-26 JP JP759278A patent/JPS54100632A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61192360U (en) * | 1985-05-22 | 1986-11-29 |
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