I need help with this please

Note that the language must be used is C

Thanks

followints Julf given sull the value of x and number of terms in Write a complete C program to compute the the sum: 3! 4! 4 For example if the number of terms is 3, then the sum will be 3 n! is defined as: m!n (n-1).(n - 2)3.21 (product of integer values from n to 1) Your code must have the main function and TWO functions one returns the sum and the second returns nl. Your code must be general for all values of integer n. Your function should NOT have any scanf or printf After reading the value of x from the user and then reading the number of terms, your program checks the input. If the number of terms is positive, it computes and displays the sum. If not, it displays an error message and terminates. Sample runs: Enter x and number of terms: 1.0 3 Enter x and number of terms: 10 2 Number of terms must be positive Enter x and number of terms: 1.5 10 sum 30817712.28 sum 1.17 Enter x and number of terms: -2.5 5 sum 4465.36