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質問 # 52
What is the correct description of an algorithm?
正解：A
質問 # 53
What is the name for computer code that humans can understand?
正解：B
解説：
High-level programming language is the term for computer code that humans can understand. In Information Technology, high-level languages are designed to be readable and closer to natural language and mathematical notation than the binary instructions used by hardware. Examples include Python, Java, C#, and JavaScript. High-level languages use keywords, structured syntax, and abstractions that allow programmers to focus on problem solving rather than on hardware-specific details like memory addresses and CPU registers.
This improves development speed, reduces errors, and makes software easier to maintain. High-level code must be translated into machine language before it can run on a computer. This translation can occur through compilation or interpretation. Compiled language and interpreted language describe how code is executed, not whether it is human-readable. Machine language is the lowest-level code expressed in binary and is not easily understood by humans. Therefore, the correct answer for human-understandable code is high-level programming language.
質問 # 54
What is the role of the compiler?
正解：A
解説：
1.Lexical Analysis:
oThe source code is first tested by the compiler's lexer, which breaks it down into tokens (such as keywords, identifiers, operators, and punctuation).
oThis step identifies the individual elements of the program.
2.Syntactic and Semantic Analysis:
oThe compiler performs syntactic analysis, checking the source code for syntax errors and ensuring it follows the correct language-specific rules.
oIf any errors occur, the compiler throws an error and stops the compilation.
oAdditionally, the compiler performs semantic analysis to find the meaning of the code.
oIt checks for logical errors, such as type mismatches, undeclared variables, and incorrect usage of operators.
3.Optimization:
oOnce the code is syntactically correct, the compiler performs low-level optimization to improve performance.
oThis may involve reducing memory usage or optimizing code for speed by rearranging instructions or eliminating unnecessary operations.
4.Output Code Generation:
oFinally, the compiler generates machine code corresponding to the original source code.
oThe resulting machine code resides in a binary file that the computer's hardware can execute directly.
Why Do We Use Compilers?
*Compilers catch syntax and semantic errors before running the code, saving time and preventing crashes.
*They optimize code for efficient execution, resulting in faster, more compact programs.
Disadvantages of a Compiler:
*Compiled code is platform-dependent, meaning it produces a machine-specific executable file.
*Code compiled on one type of machine won't run on another type without recompilation1.
References
1.GeeksforGeeks
2.Built In
3.Wikipedia
質問 # 55
Which data type should be used to calculate 90% of the retail price of an item?
正解：A
解説：
To calculate a percentage of a price, you need a data type that can handle decimal values, as the result may not be a whole number. Here's why a floating-point data type is appropriate:
1.Precision: Floating-point data types are designed to handle numbers that have a fractional part, which is essential for representing percentages accurately.
2.Calculation: When calculating 90% of a retail price, you multiply the price by 0.9. This operation requires a data type that can represent both the price and the resulting product with decimal precision.
3.Storage: Floating-point types can store a wide range of values with precision, making them suitable for financial calculations where the exact amount matters.
The other options are not suitable for the following reasons:
*A. Boolean: Can only represent two values, true or false.
*C. Auto-number: Typically used for unique identifiers and cannot represent fractional values.
*D. String: While it can represent a number as text, it is not suitable for calculations without conversion, which is inefficient and error-prone.
References: The decision to use a floating-point data type for percentage calculations is supported by best practices in programming and database design, as discussed in various programming forums and documentation123. These sources recommend using decimal or floating-point types for financial calculations to ensure accuracy and avoid errors that can arise from binary floating-point representations2.
質問 # 56
In which generafion of computers were vacuam tubes used as one of the hardware components?
正解：D
解説：
*Verified Answer: Vacuum tubes were used as one of the hardware components in the first generation of computers.
*Explanation: The first-generation computers, developed between 1946 and 1959, relied on vacuum tubes for their circuitry. These vacuum tube computers paved the way for electronic computing.
質問 # 57
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