C language

1. Write a program to add the terms of the following series. The number of terms in the series is given by the user during program execution. If the number of terms entered is 0, the result should be shown as 0. If the number of terms entered is negative, ask the user to re-enter the value. Keep doing this until a positive number is entered. Make sure the variable that holds the final result is of the correct datatype. 1 2 3 + 2! 3! 4 + 4! 1