Here is a little contest that will run for 14 days (until the 29-09-2009), where every developer should have a chance of winning!
The Contest has ended, and the winner was Yoni Holman! Congratulations!
I?ve created 7 questions, in different programming languages such as C#, F#, Ironpython, C++, Java and off course the well known and liked true or false. The questions are designed to give a number of points, where the maximum number of points given can be read in the text of the assignment. The rules are simple, the one with the highest score on points, will win. Points will be given for correctness and effort. An assignment might give 6 point, but if not entirely correct, it will be given some points for effort.
What can you win?
The winner gets Office 2007 Student version, and gets to choose one of two books ? Foundation of F# or IronPython in Action - and the runner-up gets the book that the winner did not choose.
What to do now?
If you want to try out for the books, all you have to do is:
- Leave a comment on this blog-post (in case that when you submit, and your assignment gets in my spam-mail-box, I?ll know to look for it here if its not in my usual mailbox.
- Submit your answers (as a txt file) to my mail address (ajp at clug.dk)
- Everyone is allowed to solve all the questions (if you can), or just some of them.
- When mailing me, please leave ? if you have ? your Twitter name, and I will also post the winner and runner-up on twitter (if the winner and runner-up has a Twitter name).
Here are the questions
Question number 1.
6 point
The following code compiles and runs without problems, but everything is not as it should be. When a user enters the input as shown below, what is the output? And more important, why is the output as it is?
#include <iostream>
using namespace std;
char string1[2]; char string2[2]; char string3[7]; char string4[7]; char string5[8];
int main (){
cout<< "\n Read 1. text (length 2)";
cin>> string1;
cout<< "\n Read 2. text (length 2)";
cin>> string2;
cout<< "\n Read 3. text (length 7)";
cin>> string3;
cout<< "\n Read 4. text (length 7)";
cin>> string4;
cout<< "\n Read 5. text (length 8)";
cin>> string5;
cout << "\n 1.: "<< string1;
cout << "\n 2.: "<< string2;
cout << "\n 3.: "<< string3;
cout << "\n 4.: "<< string4;
cout << "\n 5.: "<< string5;
return 0;
}
Read 1. text (length 2) - F#
Read 2. text (length 2) - C#
Read 3. text (length 7) - ASP.NET
Read 4. text (length 7) - IronRuby
Read 5. text (length 8) ? IronPython
Answer:
1. F#C#ASP.NETIronRubIronPython
2. C#ASP.NETIronRubIronPython
3. ASP.NETIronRubIronPython
4. IronRubIronPython
5. IronPython
In C++ the strings are null terminated. This means that space must be preserved for null termination character. In the assignment above, the null character is overwritten, and therefor the output is as shown.
This example does have some issues regarding compiler dependencies, and yes this was also part of the assignment ;-)
Question number 2.
9 point.
The following is an application made with the .NET Micro Framework, but the code is missing two lines! The missing parts are an Output port, and an Input port. Implement these two line to complete the code.
using System;
using Microsoft.SPOT;
using Microsoft.SPOT.Hardware;
namespace MicroFramework
{
public class Light
{
public static void Main()
{
Cpu.Pin pin = Cpu.Pin.GPIO_Pin1;
Cpu.Pin switch = Cpu.Pin.GPIO_Pin2;
//missing line
//missing line
while (true)
{
YourOutputPort.Write(YourInputPort.Read());
}
}
}
}
Answer:
OutputPort YourOutputPort = new OutputPort(pin, false);
InputPort YourInputPort = new InputPort(switch, false);
Question number 3.
3 point.
The following code is F#, and it represents an array. Finish the code, so that every item in the array is printed out to the screen.
#light
let colors = [| "Blue"; "Green"; "Yellow"; "Black"; "White"; "Red"; |]
//iterate over the array, and print out the items within the array.
Answer (There are multiple ways of doing this) :
for color in colors do
print_endline color
Question number 4.
4 point.
The following code is an array written in C#. create a LINQ query that selects the items that are less than 15 and do this:
- Using standard LINQ query
- Without the use of keyword "var" (without implicit typing).
int[] numbers = {5, 2, 10, 12, 16, 35, 20, 100};
//Create query
//iterate and print out items
Answer:
1.
var query = from i in numbers where i < 15 select i;
foreach(var i in query)
Console.WriteLine("Number: {0}", i);
2.
IEnumerable<int> query = from i in numbers where i < 15 select i;
foreach(int i in query)
Console.WriteLine("Number: {0}", i);
Question number 5.
6 point.
Implement a function in IronPython that takes one parameter, and calculates and returns the Fibonacci series. Then call your function with the number 200.
shown here in pseudocode:
FibonacciFunction(aNumber)
calculate fibonacci
return number
call function
print output
Answer:
def fibonacci(number):
result = []
a, b = 0, 1
while b < number:
result.append(b)
a, b = b, a+b
return result
fib = fibonacci(200)
fib
Question number 6.
8 point.
The following code is in Java, and it is a sorting algorithm. Two lines are missing, and you are to implement the missing lines.
public class HeapSort
{
public void heapSort (int [] A)
{
printArray(A);
makeHeap(A);
printArray(A);
for (int i = A.length-1;i >0 ;i--)
{
int temp =0;
temp = A[i];
//Line missing
A[0] = temp;
reheap(A,0, i-1);
printArray(A);
}
}
public void makeHeap(int [] A)
{
for (int j = ((A.length / 2)-1);j>=0;j--)
{
reheap(A, j, A.length-1);
}
}
public void reheap(int [] A, int current, int last)
{
int leftChild = 2* current +1;
int rightChild = 2* current +2;
int largest;
int tempA=0;
if (leftChild <= last && A[leftChild] > A[current])
{
largest = leftChild;
}
else
{
//Line missing
}
if (rightChild <= last && A[rightChild] > A[largest])
{
largest = rightChild;
}
if (largest != current)
{
tempA = A[current];
A[current] = A[largest];
A[largest] = tempA;
reheap (A , largest, last);
}
}
public void printArray(int [] A)
{
System.out.print("Array: ");
for (int i = 0; i < A.length ; i++)
{
System.out.print( A[i] + ", ");
}
System.out.println("\n");
}
public static void main(String[] args)
{
int A [] = {10,23,75,24,98,87,27,11,34,28,17,13,31,37};
HeapSort heap = new HeapSort();
heap.heapSort(A);
}
}
Answer:
A[i] = A[0];
largest = current;
Question 7.
Each correct answer will give 1 point each. (max point is 21).
In this assignment you should answer "true" or "false" to the following questions:
- IronPython is the .NET version of Python.
- IronPython is a functional programming language.
- There is nothing called IronRuby from Microsoft.
- IronPython does not work in a web browser.
- IronPython is a dynamic programming language.
- IronPython can interact with the C# programming language.
- IronPython is an OpenSource language.
- F# is a dynamic programming language.
- F# does not work with WPF (Windows Presentation Foundation).
- F# only works with math and formulas.
- F# works with Windows Forms.
- F# only runs on Windows Computers.
- F# is an OpenSource language.
- C# is the only programming language in .NET family.
- C# can only be used on Windows computers.
- The .NET MicroFramework is used for embedded systems.
- ASP.NET is a Java version of PHP.
- ASP.NET can only be used on Windows computers.
- ASP.NET, C#, F# and Silverlight all run on Linux.
- Moonlight on Linux is the same as C# on Windows.
- Mono is the same as F# on Windows.
Answer:
1. true
2. false
3. false
4. false
5. true
6. true
7. true
8. true
9. false
10. false
11. true
12. false
13. true
14. false
15. false
16. true
17. false
18. false
19. true
20. false
21. false
The text in small print
Everyone from every country is allowed to participate in this contest. The winner and runner-up will be notified by me personally, and I will personally send the books to their home address. If the winner and runner-up will allow it, their names will be posted on this website after I have talked to them.
All I can say now is good luck, and I hope you find this fun :-)
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