Program 7-12: Write a program using user defined function that accepts length and breadth of a rectangle and returns the area and perimeter of the rectangle.

Question

Accepted Answer

> [!TLDR]
> Program 7-12 returns two values from one function: `return area, perimeter` packs them into a tuple, and `area, perimeter = rectangle(l, b)` unpacks them in the caller.

**The idea.** A Python function can hand back any number of results in one `return` — the comma builds a **tuple**, and tuple *unpacking* on the caller's side gives each value its own name. That is cleaner than printing inside the function or calling twice.

```python
# Program 7-12: area and perimeter of a rectangle from one function

def rectangle(length, breadth):
    area = length * breadth
    perimeter = 2 * (length + breadth)
    return area, perimeter        # a tuple (area, perimeter)

l = float(input("Enter length of the rectangle: "))
b = float(input("Enter breadth of the rectangle: "))
area, perimeter = rectangle(l, b)
print("Area      :", area)
print("Perimeter :", perimeter)
```

**Key lines**
- `return area, perimeter` — equivalent to `return (area, perimeter)`; one object (a tuple) travels back.
- `area, perimeter = rectangle(l, b)` — unpacking; the order matches the order in the `return`.

**Expected output** — sample run with length 7.5 and breadth 4:

```
Enter length of the rectangle: 7.5 …

Q.Program 7-12: Write a program using user defined function that accepts length and breadth of a rectangle and returns the area and perimeter of the rectangle.

Concept understanding — Pass By Object Reference

Pass by Object Reference — A First Look

The Precise Statement

See It in Action

Q.Program 7-12: Write a program using user defined function that accepts length and breadth of a rectangle and returns the area and perimeter of the rectangle.

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