Character Encoding
Muhtasari
Memory holds numbers. Text is not numbers. Somewhere between the key you press and the letter that appears there has to be an agreement, written down and obeyed by every piece of hardware and software in the chain, that this particular pattern of bits means the letter H. That agreement is a character set, and the whole reason you can send a message from a phone in one country to a laptop in another and have it arrive readable is that both ends are using the same one.
This lesson covers the two encoding methods the specification names, 7-bit ASCII and Unicode. You will learn what a character set actually is, why the codes inside one are arranged in runs rather than scattered, how to use a given table to go from characters to codes and back, and why a scheme with only 128 codes could not serve a world that writes in hundreds of scripts. You will also meet the single most useful consequence of the sequential arrangement: once you know one code in a group, you can work out the rest by counting.
Malengo
- Understand what a character set is and be able to describe the following character encoding methods:
- 7-bit ASCII
- Unicode. Understand that character codes are commonly grouped and run in sequence within encoding tables.
- Describe the purpose of Unicode and the advantages of Unicode over ASCII.
- Know that Unicode uses the same codes as ASCII up to 127.
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Maelezo ya Somo
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Tathmini ya Somo
Hongera kwa kukamilisha somo la Character Encoding. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.
Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.
Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.
- How many different characters can be represented using 7-bit ASCII? A. 7 B. 64 C. 128 D. 256 Answer: C
- In ASCII the character A has the code 65. What is the character code for D? A. 66 B. 67 C. 68 D. 69 Answer: C
- Which statement about Unicode is correct? A. Unicode can represent fewer characters than ASCII B. Unicode uses the same codes as ASCII up to 127 C. Unicode uses exactly 7 bits for every character D. Unicode cannot represent the English alphabet Answer: B
- The character codes for the lower case letters begin with a at 97. What is the code for the letter d? A. 99 B. 100 C. 101 D. 104 Answer: B
- Why are the character codes for the capital letters stored in sequence? A. So that the codes for the rest can be worked out once one is known B. So that capital letters take up less memory than lower case letters C. So that the codes can be stored without using any bits D. So that the same code can mean two different characters Answer: A
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Ungependa kufanya mazoezi ya maswali ya majaribio kuhusu Character Encoding? Pakua programu ya Green Bridge CBT ili kupata maswali ya majaribio na tathmini kamili za mazoezi kuhusu mada hii.
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