Write a C program,

num_sum.c

, to ask the user

for a positive integer number (assume that the

input is greater than 0)

.

Your program must print out the number of digits and sum of the digits

.

For example, if the user inputs 1991, you should output

something like

The number has

4

digit(s), sum of which is

20.

The calculations must happen in a function called

num_sum

()

which has the following declaration.

void num_sum(int n, int *num, int *sum);