C# Basics
Variables & constants, primitive types, control flow, classes, structs, interfaces, exceptions
1What is a variable in C#?
What is a variable in C#?
Câu trả lời
A variable is a named storage location in memory that holds a value which can be modified during program execution. Each variable has a type that determines what values it can contain and what operations are allowed. Declaring a variable with an explicit type allows the compiler to verify code consistency and optimize memory usage.
2What is the difference between a variable and a constant in C#?
What is the difference between a variable and a constant in C#?
Câu trả lời
A variable can have its value changed after initialization, whereas a constant receives a value at compilation that remains fixed throughout the program's lifetime. Constants are declared with the const keyword and must be initialized with a compile-time known value. Using constants for immutable values improves readability and enables compiler optimizations.
3What is the appropriate type to store a simple integer in C#?
What is the appropriate type to store a simple integer in C#?
Câu trả lời
The int type is the most commonly used integer type in C# for storing whole numbers. It occupies 32 bits in memory and can hold values ranging from approximately -2 billion to +2 billion. For most use cases involving counters, indices, or quantities, int provides a good balance between value range and performance.
What type should be used to store a true/false value in C#?
What is the correct syntax to declare a constant in C#?
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