Write a code using a loop of your choice to display the sum of the series $.$

Get the input from the user.

Testcase$1$:

Input: $4$

Output: $9+99+999+9999$

Testcase$2$:

Input: $1$

Output: $9$

Test case$2$:

Input: $0$

Output: $"$no output"

Write in C and show code please.