app/routers/calculator.py

from fastapi import APIRouter

# Create the router for calculator endpoints
router = APIRouter(
    prefix="/calculate",
    tags=["Calculator"] 
)

@router.get("/add")
def add_numbers(a: float, b: float):
    """
    Adds two numbers, 'a' and 'b'.
    
    Query parameters: a (float), b (float)
    """
    result = a + b
    return {
        "operation": "addition",
        "a": a,
        "b": b,
        "result": result
    }

@router.get("/subtract")
def subtract_numbers(a: float, b: float):
    """
    Subtracts number 'b' from number 'a' (a - b).
    
    Query parameters: a (float), b (float)
    """
    result = a - b
    return {
        "operation": "subtraction",
        "a": a,
        "b": b,
        "result": result
    }