File Handling
Akopọ
When a program stops, everything it was holding in memory vanishes. So how does a game remember your progress, or a program keep a high score between sessions? The answer is file handling: writing data out to a file that survives after the program ends, and reading it back when the program runs again.
In this lesson you will learn why programs store data in files, then learn the standard pseudocode for opening, reading from, writing to and closing a file. You will trace small routines that save and reload data so you can write file-handling code with confidence in the exam.
Awọn Afojusun
- 1 Understand the purpose of storing data in a file to be used by a program
- 2 Open, close and use a file for reading and writing
Akọ̀wé Ẹ̀kọ́
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori File Handling. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- Why does a program store data in a file rather than only in a variable? A. files run faster than variables B. data in a variable is lost when the program ends, but a file keeps it C. variables cannot hold numbers D. files do not need to be opened Answer: B
- Which pseudocode keyword opens a file ready to read from it? A. WRITEFILE B. CLOSEFILE C. OPENFILE name FOR READ D. EOF Answer: C
- What does opening a file FOR WRITE do to data already in the file? A. appends to the end B. leaves it unchanged C. overwrites it D. encrypts it Answer: C
- Which statement saves changes and frees a file after use? A. OPENFILE B. READFILE C. WRITEFILE D. CLOSEFILE Answer: D
- What does EOF(name) return when the end of the file is reached? A. the last line B. FALSE C. TRUE D. the filename Answer: C
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
O wa lori ohun elo Green Bridge
Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.
Awọn Iwe Itọsọna Ti a Gba Nimọran
Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa File Handling? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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