You want to create a class Rectangle that can be initialized with width and height, or with no parameters (defaulting to 1 for both). Which constructor setup is correct?
hard🚀 Application Q8 of 15
C Sharp (C#) - Classes and Objects
You want to create a class Rectangle that can be initialized with width and height, or with no parameters (defaulting to 1 for both). Which constructor setup is correct?
Step 1: Understand constructor overloading for default and parameterized
public Rectangle() { Width = 1; Height = 1; } public Rectangle(int w, int h) { Width = w; Height = h; } defines two constructors: one parameterless with defaults, one with parameters.
Step 2: Check other options for correctness
public Rectangle(int w, int h = 1) { Width = w; Height = h; } uses optional parameter but requires w so new Rectangle() fails; C duplicates parameterless constructors; D lacks parameterless constructor.
Final Answer:
public Rectangle() { Width = 1; Height = 1; } public Rectangle(int w, int h) { Width = w; Height = h; } -> Option A
Quick Check:
Overloaded constructors for defaults = B [OK]
Quick Trick:Use overloaded constructors for default and custom initialization. [OK]
Common Mistakes:
MISTAKES
Using optional parameters without allowing zero arguments
Defining duplicate parameterless constructors
Omitting parameterless constructor when needed
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