Please, need help with this assigment in C programing language

In put 1.

a) Ask for n. Check for bounds (1 <= n && n <= 10).

b) If the user entered an integer within (1 and 10), move on to getting the value for k

c) Else keep asking the user till they give a correct value which is an integer within 1 and 10.

d) Reject any input greater than 10 or less than 1 by displaying an error message and then asking the user to re-enter the input. Do this as many times that they enter incorrect input.

2) In put 2.

a) Ask for k. Check for bounds (1 <= k && k <= n).

i) If the user entered an integer within (1 and n), move on to next step.

ii) Else keep asking the user till they give a correct value which is an integer within 1 and n.

iii) Reject any input greater than n or less than 1 by displaying an error message and then asking the user to re-enter the input. Do this as many times that they enter incorrect input.

3) Calculate n k.

4) Calculate factorial of n, k and n k.

5) Calculate the Combination by plugging in factorial of n / (factorial of k * factorial of n - k)

6) Output

a) Print 5, the number of combinations of n things taken k at a time. This is the output of your program.

Assume that all of the internal calculations can be done using integers, i.e. don't worry about integer overflow.