concepts and fundamentals Flashcards
What is an algorithm?
A step-by-step process to solve a problem.
What is the purpose of the Main() method in C#?
It is the entry point where execution begins.
What are the common C# data types?
int, double, float, char, string, bool, decimal.
What is the difference between float, double, and decimal?
float and double store approximations; decimal is more precise for financial calculations.
What is the difference between == and Equals() in C#?
== compares values; Equals() checks object equality.
What is type casting in C#?
Converting one data type to another (implicit or explicit).
What are if, else, and switch statements used for?
Conditional logic execution.
What is a for loop used for?
Iterating a block of code a fixed number of times.
What is the difference between while and do-while loops?
while checks the condition first; do-while executes at least once.
What is an array in C#?
A collection of elements of the same type, accessed via an index.
How do you declare and initialize an array in C#?
int[] numbers = { 1, 2, 3, 4, 5 };
What is a method in C#?
A reusable block of code that performs a specific task.
What is method overloading?
Defining multiple methods with the same name but different parameters.
What is exception handling in C#?
Using try-catch-finally to handle runtime errors.
What is a List<T> in C#?</T>
A dynamic collection of elements that can grow and shrink.
How do you declare a List<T> in C#?</T>
List<int> numbers = new List<int> { 1, 2, 3 };</int></int>
What is file handling in C#?
Reading and writing data to files using StreamReader and StreamWriter.
What is the purpose of the StringBuilder class?
To efficiently manipulate strings without creating multiple immutable objects.
What does string.Split() do in C#?
Splits a string into an array based on a delimiter.
How do you read all lines from a text file in C#?
string[] lines = File.ReadAllLines(“file.txt”);
