Newbie learnin C, need help on a Ques

This is what i am tryin to write for

EX: write a program that inputs 3 different integers from the keyboard, then prints the sum, the average, the product , the smallest and the largest of these numbers. use only single-section form of if statements....

screen should look like this:

Input three different integers: 13 27 14
Sum is 54
Average is 18
Product is 4914
Smallest is 13
Largest is 27



This is what i got sofar , cant get the smaller and larger to work.......

#include <stdio.h>

int main()
{
int x,y,z,sum,avg,prod,sml,large;

printf( "Enter three numbers:" );
scanf( "%d%d%d" , &x, &y , &z );

sum = x+y+z;

printf( "sum is %d\n", sum );

avg = sum/3;

printf( "avg is %d\n", avg );

prod = x*y*z;

printf( "prod is %d\n", prod );



return 0;

}

 

got that one can anyone do this:
was easy tryin to teach myself aint goin that well



What i need to do:


The factorial of a non-negative integer n is written n! (pronounced "n factorial") and is defined as follows:

n! = n * (n-1) * (n-2) * ... * 1 (for values of n greater than or equal to 1)

and

0! = 1

For example 5! = 5*4*3*2*1, which is equal to 120.

Write a program that inputs a non-negative integer and computes and prints its factorial. Use a "while loop" as part of your program implementation.

Implement the program described above using Top-Down, Stepwise refinement (as demonstrated in the Chapter 3 course slides). Include in a large comment block at the start of the program ( start the comment block with /* and end it with */ ) the Pseudo Code produced for the 3 stages of Stepwise refinement.

As the programmer, you are responsible for making sure that your program is computing the correct values. I will sometimes assist you in this by supplying some of the test data I will be using to test your program. One of the tests I will run is to see if your program can correctly compute 12! (the answer is: 479001600).

 

havnt run this buuuuut

Code:

assume whatever headers  you need are included,  this is just math and functions

long factorial(long x)
{

   return (x != 0 ) ? ( x * factorial(x - 1) ) : 1; // if x is 0 break recursion
}

 

couldnt get it to work .. thx anyways