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Calculate, compare and copy is a beginner-friendly way to describe three things a computer can do with information: perform arithmetic, check data against other data or a condition, and reproduce or move data to create an output. These actions often work together—for example, a program can find matching records, total their values and place the result in a report.
What does “calculate, compare and copy” mean?
The phrase describes a simple model of data processing. It answers the introductory question, “What can the computer do with the information?” The three verbs are useful for understanding familiar tasks, but they are not a complete technical description of how computers or processors work.
Netaji Subhas Open University’s learning material uses the three actions to explain examples such as sorting records, finding a customer by account number, adding values for matching records and editing text. Read the university learning material.
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Calculate: perform arithmetic on data
To calculate is to apply mathematical operations to data. A computer might add a set of amounts, subtract one value from another, or calculate a total from selected records.
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For example, a payroll program can add salary values to produce a total. In a more selective task, it can first identify which records belong in the total, then add only those values.
Compare: check data against a value or condition
To compare is to match or evaluate information against known data or a requested value. A comparison can test whether two entries are equal, determine which value is higher, or check whether a record meets a condition.
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- Searching: A program can compare account numbers in customer records with the number being sought.
- Sorting: It can compare values in records to determine their order.
- Filtering: It can check whether a record’s job title matches a requested title, such as “NURSE.”
Copy: reproduce or move data to make an output
To copy is to reproduce or move data from one place to another so it can be used in a report, listing or other output. When a program sorts records, for example, it can copy each record into its new position in the ordered result. Text editing also involves copying characters as text is rearranged or placed elsewhere.
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How the three actions work together
Consider a request to find the combined salary of all employees whose job title is “NURSE.” The program compares each title with the requested title, calculates a total from the salaries of matching records, and copies the result into a report or display.
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- Compare: Check each employee record to see whether its title matches “NURSE.”
- Calculate: Add the salary values from records that match.
- Copy: Put the total into the requested output, such as a report.
The order and combination vary with the task. Sorting uses comparisons to choose an order and copying to form the reordered result; arithmetic may not be needed. A search may compare values and return a matching record without calculating a total.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is this a complete account of computer processing?
No. “Calculate, compare and copy” is a teaching model for describing common data-processing operations, not a claim that every computer operation can be reduced to those three verbs. The university material and ComputerLanguage.com’s encyclopedia entry explain the phrase and its examples; neither is a current processor-architecture specification. ComputerLanguage.com attributes the phrase to Alan Freedman, but that attribution is what the encyclopedia reports and does not independently establish the original coinage. See the ComputerLanguage.com entry.
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