Questions and Answers
Fields are declared outside a class declaration.
False
To type a decimal literal, you must type the letter ________ at the end of a real number.
M or m
After defining a property, you must call the get and set accessors to manipulate it.
False
The order in which methods are declared in a class declaration determines when those methods are called at execution time.
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Which of the following list correctly orders which type has fewest to the most significant digits?
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How can a private variable be accessed?
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A class diagram helps you design a class, so it is required to show every implementation detail.
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Which of the following simple types should be used for monetary values?
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An object's property can have which of the following accessors?
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Which of the following method headers does the following method call match? Action("This is an example, 15, 25.5")
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Each object of a class is identical except for the values and references it holds.
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A ________ is called to initialize a new instance of a class.
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In general, how many classes are there in a program/app?
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Let z represent a format specifier. How is the format specifier included in WriteLine?
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How would the following method header be represented in a UML class diagram? public void DisplayMessage(string coursename);
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C# is known as an extensible language because it declares all classes ahead of time.
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What is the difference between a float and a double?
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By including only the get accessor, the private variable can be assigned a new value.
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Which method converts a string into an int?
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UML represents instance variables and properties as attributes by listing the attribute name followed by a colon and the attribute type.
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Study Notes
Fields and Properties
- Fields are declared within a class declaration, not outside.
- Properties can be accessed via get and set accessors without needing to call them explicitly.
- A property without a set accessor is read-only, preventing assignment of new values.
Literal Types and Formatting
- Decimal literals require 'M' or 'm' at the end of real numbers to specify their type.
- The format specifier in WriteLine is included using the syntax
{ 0:z }.
Data Types and Usage
- The correct order of data types from fewest to most significant digits is: float, double, decimal.
- For monetary values, the recommended type is decimal due to precision.
- Double variables are preferred for larger magnitude and finer detail compared to floats.
Class Structure and Diagrams
- Class diagrams do not need to show every implementation detail; they help in the design process.
- Each object of a class is unique based on the values and references it holds, despite sharing the same structure.
Access Modifiers and Methods
- Private variables can be accessed from within the same class, through properties, or specific methods of the class.
- An object's property can utilize both get and set accessors to manage its value.
- Method signatures in UML are represented with a '+' followed by the method name and parameter types.
Constructors and Class Relationships
- A constructor is used to initialize a new instance of a class.
- Programs or applications typically consist of one or more classes.
Type Conversion
- Strings can be converted into integers using the method
Convert.ToInt32.
Truth Statements
- UML notation represents instance variables and properties as attributes, marking them as true.
- Statements about class properties and the nature of C# as an extensible language can vary, indicating specific features or misconceptions in understanding.
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Description
This quiz covers essential concepts in C# programming, including class structures, data types, and properties. Understand the differences between fields and properties, the significance of literal types, and the proper usage of data types for different needs.
