C Program to Calculate the Sum of Factorials of Even Numbers

The program calculates the sum of the factorials of even numbers from 2 to 10.

In the main function, it calls the 'sum' function and prints the result using 'printf'.

The 'sum' function initializes a variable 'f' to 0. It then uses a 'for' loop to iterate through even numbers from 2 to 10. For each even number, it calculates the factorial by initializing a variable 's' to 1 and then using another 'for' loop to multiply 's' by each number from 1 to the current even number. It adds the factorial to the variable 'f'.

Finally, it returns the value of 'f'.