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C language assignment along with its solution. Let's assume the assignment is about creating a program to calculate the factorial of a given number using a recursive function. **Assignment: Factorial Calculation** Write a C program to calculate the factorial of a positive integer using recursion. The factorial of a non-negative integer `n` is the product of all positive integers less than or equal to `n`. It is denoted by `n!`. The factorial of `n` is defined as follows: - `0!` is equal to `1`. - For any positive integer `n`, `n! = n * (n-1)!`. Your program should perform the following steps: 1. Ask the user to input a positive integer (`n`). 2. Calculate the factorial of `n` using a recursive function. 3. Display the result. **Solution:** ```c #include <stdio.h> // Function to calculate factorial using recursion int factorial(int n) {     if (n == 0) {         return 1;     } else {      ...