Hi I need help in writing the recursive functions for the following in C, please write a main() that test the functions mentioned below. Thank you so much:

Example:

int summ(int n) returns the summation of integers from 0 to n. Here is the code.

int summ(int n) { if(n < 0) return -1; if(n == 0) return 0; return n + summ(n - 1); }

1)

a)int bunnyEars(int n) returns -1 if n is less than 0, otherwise returns the number of ears for n bunnies.

b) int factorial(int n) returns -1 if n is less than 0, otherwise returns the factorial of n c) int fib(int n) returns -1 if n is less than 0, returns 0 if n is 0, returns 1 if n is 1, otherwise returns fib of n - 1 plus fib of n - 2. (If you test this with numbers greater than about 50, it will be very slow.)

d) int posPow(int base, int exp) returns -1 if exp is less than 0, otherwise returns base raised to the power exp.

e) int numDigits(int n) returns the number of digits in n. Hint: in C, as in Java, int division returns an int; any digits that would be after the decimal point are lost, so that, for example, 5/4 is 1.