Functions (also called methods in C#) are essential for writing clean, reusable code.
🛠️ How to Declare a Function
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int Add(int a, int b)
{
return a + b;
}
int: Return type (the function returns an int)Add: Function name(int a, int b): Parameters (inputs)
🚀 How to Call a Function
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int result = Add(2, 3);
Console.WriteLine(result); // 5
📦 Functions with No Return Value
Use void when your function doesn’t return anything:
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void SayHello(string name)
{
Console.WriteLine($"Hello, {name}!");
}
SayHello("Alex");
📝 Why Use Functions?
- Avoid repeating code (DRY: Don’t Repeat Yourself)
- Break big problems into small pieces
- Make your program easier to read and fix
💡 Try It!
Write a function that checks if a number is even:
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bool IsEven(int n)
{
return n % 2 == 0;
}
Console.WriteLine(IsEven(4)); // True
Next: Learn more about function parameters and return values!
