C++ Program for Series: 9 + 99 + 999 + ... (n terms)

Описание: This program reads a positive integer n (the number of terms) and computes the sum of the series:
9 + 99 + 999 + ... up to n terms.

How it works (brief):

Use term = term * 10 + 9 inside a loop to generate each term (9, 99, 999, ...).

Add each generated term to sum.

Print the final sum.

Example:
If n = 4, the program computes 9 + 99 + 999 + 9999 = 11106.

Complexity:
Time: O(n) — single loop up to n.
Space: O(1) — only a few variables used.

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