Electronic apparatus for dealing with numerical information

• US 4,164,789 A
• Filed: 01/06/1978
• Issued: 08/14/1979
• Est. Priority Date: 10/23/1975
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kawanabe, Tsuyoshi, Toyomura, Sigeru
• Primary Examiner(s): Smith, Jerry
• Application Number:
  US05/867,503
• Time in Patent Office: 585 Days
• Field of Search: 364/710, 364/715, 235/60 AP, 235/61 PK, 235/61.9 R
• US Class Current: 708/170
• CPC Class Codes: G06F 3/027 for insertion of the decimal point
• CPC Class Codes: G06F 3/1407 General aspects irrespective of display type, e.g. determination of decimal point position, display with fixed or driving decimal point, suppression of non-significant zeros

Abstract

A calculator provided with a key for entering decimal point data and a memory device for storing data therein is disclosed. Such calculator has a control device responsive to the operation of the key for entering decimal point data to cause the memory device to store a plurality of decimal point data. The stored decimal point data is then visualized.

Claims

1. Electronic calculating apparatus for dealing with numerical information comprising:

a key input device provided with numerical keys for entering numerical data signals, a decimal point key for entering a decimal point signal and instruction keys for entering instruction signals;

a first memory for storing numerical data signals and data classification mark signals, wherein the data classification mark signals are represented by decimal point signals entered by said decimal point key;

a second memory for storing numerical data signals and a single decimal point signal;

control means for causing said first memory to store a plurality of data classification mark signals and for causing said second memory to store a single decimal point signal providing a distinction between the integer and decimal portions of the numerical data, when said decimal point key is depressed repeatedly; and

means, responsive to the operation of a specified one of said instruction keys, for reading out the signals stored in said first memory.

2. Electronic calculating apparatus according to claim 1 further comprising means for visualizing as dot marks the plurality of data classification mark signals read out from said first memory by said read out means.

3. Electronic calculating apparatus according to claim 1, wherein said control means controls said second memory to reposition the decimal point signal stored therein whenever said decimal point key is depressed.

4. Electronic calculating apparatus for dealing with numerical information comprising:

data classification entry means for entering data classification signals into the apparatus;

manual switch means for changing the treatment of the data classification signals which have been entered from said data classification entry means;

storage means for storing the data classification signals from said data classification entry means; and

control means, responsive to the operation of said data classification entry means, for causing said storage means to store a number of classification signals corresponding to the number of successive operations of said data classification entry means when said manual switch means is operated, and for causing said storage means to store a single data classification signal as a decimal point signal providing a distinction between the integer and decimal portions of numerical data when said manual switch means is not operated.

5. An apparatus according to claim 4 wherein said storage means comprises a first memory, a second memory and a third memory, wherein said control means causes said first memory to store data classification signals while simultaneously causing said second memory to store a single decimal point signal, and wherein in accordance with the operation of said manual switch means, data from one of said first and second memory means is transferred to said third memory.

6. An apparatus according to claim 4 further comprising means for visualizing the plurality of data classification signals stored in said third memory as a plurality of dot marks.

7. Electronic calculating apparatus for dealing with numerical information comprising:

a keyboard having numerical keys for entering numerical data, data classification entry keys for entering data classification signals and instruction keys for entering a plurality of instructions;

control means, responsive to the operation of said data classification entry key, for causing the data classification signals, corresponding in number to the number of successive operations of said data classification entry key, to be treated as true information when a specified one of said instruction keys is operated after said data classification entry key is operated, and for causing a single data classification signal to be treated as a decimal point signal providing a distinction between the integer and decimal portions of numerical data when any one of the remaining instruction keys is operated after said data classification entry key is operated.

8. An apparatus according to claim 7 wherein said control means causes a first memory to store a plurality of data classification signals while causing a second memory to store a single data classification signal as a decimal point signal.

9. An apparatus according to claim 8 further comprising means for visualizing the plurality of data classification signals stored in said first memory.