Input/output And File Handling
Overzicht
Close a program and everything it was holding disappears. Every variable, every array, every record: gone the instant the process ends, because they lived in memory and memory is handed back. A high score that survives until tomorrow, a register that is still there next term, a saved game: all of them require the program to push its data across a boundary, out of itself and onto something that outlives it.
This lesson covers the three things the specification asks for. Obtaining user input from a keyboard, outputting data and information from a program to the computer display, and reading from and writing to a text file. You will learn why everything typed at a keyboard arrives as text whatever it looks like, how a program knows when a file has run out, and the difference between writing to a file and adding to one, which is the difference between saving today's readings and destroying every reading you ever took.
Doelstellingen
- Be able to obtain user input from a keyboard. Be able to output data and information from a program to the computer display. Be able to read/write from/to a text file.
Mindmap
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Lesnotitie
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Lesevaluatie
Gefeliciteerd met het voltooien van de les op Input/output And File Handling. Nu je de sleutelconcepten en ideeën, het is tijd om uw kennis op de proef te stellen. Deze sectie biedt een verscheidenheid aan oefeningen vragen die bedoeld zijn om uw begrip te vergroten en u te helpen uw begrip van de stof te peilen.
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- What data type does a value obtained from a keyboard have before any conversion? A. Boolean B. Integer C. Real D. String Answer: D
- A program opens an existing text file in write mode. What happens to the data already in the file? A. It is kept and new data is added at the end B. It is kept and new data is added at the start C. It is destroyed D. The program refuses to open the file Answer: C
- Which loop structure is most appropriate for reading every line of a text file whose length is not known? A. A FOR loop from 0 to the number of lines B. A WHILE loop testing for the end of the file C. A FOR loop from 1 to 100 D. No loop is needed Answer: B
- Why should a program close a file it has written to? A. To force any buffered data out to the disk and release the file B. To convert the data into text C. To sort the contents of the file D. To make the file readable by a person Answer: A
- A program stores data in a file rather than in an array. What is the main advantage? A. The data can be sorted more quickly B. The data survives after the program ends C. The data does not need to be converted D. The data uses less memory while the program runs Answer: B
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