Functions

Functions

In HolyC, functions are declared by writing the return type first, then the function name, then parameters in parentheses.

Syntax

ReturnType FunctionName(ParamType param1, ParamType param2) {
  // body
  return value;
}

Example

I64 Add(I64 a, I64 b) {
  return a + b;
}

I64 result = Add(3, 4);
Print("%d\n", result);  // 7

Void Functions

Use U0 as the return type for functions that return nothing (equivalent to C's void):

U0 Greet(U8 *name) {
  Print("Hello, %s!\n", name);
}

Greet("Terry");  // Hello, Terry!

Forward Declarations

In HolyC, functions can call other functions defined later in the file — the compiler handles forward references automatically. This is a convenience over C where you'd need prototypes.

Recursion

Recursive functions work as expected:

I64 Factorial(I64 n) {
  if (n <= 1) return 1;
  return n * Factorial(n - 1);
}

Print("%d\n", Factorial(5));  // 120

Your Task

Write a function I64 Square(I64 n) that returns n * n. Call it with 9 and print the result.

Expected output: 81