Posted by Gurv on Wednesday, November 29, 2006 at 1:05am.
Algorithm for Binomial Numbers
Task
Binomial numbers (or binomial coefficients) are important positive integers that arise frequently in computing and mathematics. A function to compute binomial coefficients will have two inputs: n and k. The corresponding coefficient is written as nCk.
/* pseudocode for Binomial Coefficients */
int binomial(int n, int k)
{
If (n < k) Then return (0)
Else
{
Set denominator = 1*2*...*k
Set numerator = (nk+1)*(nk+2)*...*(n1)*n
return (numerator / denominator)
} // else
End if
}
Here are some additional notes:
Because binomial numbers are integers, the return type should be int, and the two parameters, n and k, are also integers.
We have used the notation
1*2*…*k
to indicate the product of consecutive numbers. For example,
1*2*…*5
is actually
1*2*3*4*5 = 120
Similarly,
6*7...*10 = 6*7*8*9*10 = 30,240
Part of the challenge in this exercise is to figure out how to compute this product. You should review the for loop in module 3, and recall how for loops are written in C++. Also review the programming exercise on exponentiation in module 3.
You can use integer division in line 7 above—it turns out that if numerator and denominator are computed as shown above, denominator will always evenly divide numerator.
To test this function, you must write a driver (in the code template given below, the driver is the main function).
You should design a suitable test suite and test your program using it. The test suite is part of the materials that you will be submitting.
Code Template for Exercise 1
/****************************************************/
/* File: name of your file with the source code */
/* */
/* Created by: give your name */
/* Date: give the date */
/* */
/* Program to compute binomial coefficients */
/* */
/* Inputs: (keyboard) */
/* Two positive integers (n & k) */
/* */
/* Output: */
/* Corresponding binomial coefficient (nCk) */
/* */
/* Algorithm: see attached description */
/****************************************************/
#include <iostream>
using namespace std ;
int binomial(int n, int k) ; // function prototype
int main()
{
int n, k ; // parameters for the binomial number
int result ;
cout << endl ;
// read in n & k
cout << "Enter n (positive integer) : " ;
cin >> n ;
cout << "Enter k (positive integer) : " ;
cin >> k ;
result = ?? Write the function call ;
cout << "Binomial number " << n << "C" << k
<< " = " << result << endl ;
return (0) ;
}
// ********************************************************
binomial(int n, int k)
/* Computes the binomial coefficient nCk */
/* */
/* Inputs: */
/* n, k (integers) */
/* */
/* Output: */
/* binomial coefficient nCk (integer) */<![endif]>
{
int numerator, denominator ;
int i ; // needed to compute numerator & denominator <![endif]>
if (?? Write iftest)
{
return(??) ;
}
else
{
denominator = ?? ; // initial value <![endif]>
for (i = ?? ; i <= ?? ; i = i+1)
denominator = ?? * ?? ; <![endif]>
write code to compute numerator, along similar lines<![endif]>
return (??) ;
} // else
}

computer science  Bobby, Friday, November 30, 2007 at 10:07pm
Heh i have thes ame problem

computer science  moges, Wednesday, December 31, 2008 at 2:12am
really nice 10Q a lot

computer science  HOLLA, Monday, August 19, 2013 at 12:05pm
ou need to perform the following actions for this CheckPoint assignment:
 Modify the Inventory Program by adding a button to the GUI that allows the user to move to the first item, the previous item, the next item, and the last item in the inventory. If the first item is displayed and the user clicks on the Previous button, the last item should display. If the last item is displayed and the user clicks on the Next button, the first item should display.
 Add a company logo to the GUI using Java graphics classes.
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