Relational Operations In A Programming Language
Gbogbo ọrọ náà
A pass mark of 40 sounds like the least ambiguous instruction in education until somebody has to write it down as a condition. Is 40 a pass? If the code says the mark must be greater than 40 then it is not, and every candidate on exactly 40 has just been failed by a single character. Relational operations are where a specification in English turns into a decision a machine makes, and the whole topic lives on that boundary.
This lesson covers the six comparisons the specification names, the exact symbols that assessment material uses for them, and the fact that every one of them produces a Boolean and nothing else. You will learn how comparison works on text as well as on numbers, why comparing two real numbers for exact equality is a trap, and how the six pair up into opposites so that you can negate any condition without thinking twice about it.
Ebumnobi
- Be familiar with and be able to use:
- equal to
- not equal to
- less than
- greater than
- less than or equal to
- greater than or equal to.
- In assessment material we will use the following symbols: =, ≠, <, >, ≤, ≥
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Ekele diri gi maka imecha ihe karịrị na Relational Operations In A Programming Language. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
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- A holds 8 and B holds 8. Which expression is True? A. A < B B. A > B C. A ≥ B D. A ≠ B Answer: C
- Which condition correctly tests the rule that a temperature of 100 degrees or above triggers an alarm? A. Temperature < 100 B. Temperature ≤ 100 C. Temperature > 100 D. Temperature ≥ 100 Answer: D
- What is the exact opposite of the condition Count < 10? A. Count > 10 B. Count ≥ 10 C. Count ≤ 10 D. Count ≠ 10 Answer: B
- An array holds 20 items. Which loop condition visits every item exactly once, with Index starting at 0? A. Index < 20 B. Index ≤ 20 C. Index < 19 D. Index ≠ 21 Answer: A
- Two strings are compared. Which statement is correct? A. The longer string is always the greater B. Strings can only be tested for equality C. Strings are compared character by character using character codes D. Capital letters and lower case letters compare as equal Answer: C
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