Answer / himanshu

Well this is what I tried to make it more simple, no list...
just checking and calling functions.

int calculate_prime(int prime_no)
{
int check,count=0;
while(prime_no != 0)
{
check=check_prime(prime_no);
if (check == 0)
count++;
prime_no--;
}
return count;
}
int check_prime(int prime_no)
{
int num,prime_check=0;
num=prime_no/2;
while(num > 1)
{
if( (prime_no%num) == 0 )
{
prime_check=1;
break;
}
num--;
}
return prime_check;
}

void main()
{
int a;

//TEST CASE 1:
//PASSING 11 AS ARGUEMENT TO calculate_prime FUNCTION
//PREFERRED OUTPUT SHOULD BE 6
a=calculate_prime(11);
printf("%d",a);

//TEST CASE 2:
//PASSING 10 AS ARGUEMENT TO calculate_prime FUNCTION
//PREFERRED OUTPUT SHOULD BE 5
a=calculate_prime(10);
printf(" , %d",a);


getch();
}

Answer / softwareguy

This is what I came up with (C#):

PSEUDO:
-Craete a list of numbers uptill n number - n being int
parameter
-Pass this list into a function to check for primilaty for
the number and then print primes wile we count for primes

BACKGROUND OF THIS SOLUTION:

THEORY:
- we know primes are the numbers starting from 2 are
divisible with 1 and themselves only i.e. n being a prime
number can only be divisble as n/n or n/1. testing from a
prime is called "primilatiy test" for a number...
-the simplest primality test is to see if given a number n
is divisible by an integer m from 2 to n-1. If n is
divisible by n then n is a composite number otherwise its a
prime...

TO SPEED UP THE COMPUTING WE CAN ALSO:
Rather than testing till n-1 we can test the number till
Square Root of n i.e. if n is a prime number it can always
be factored into 2 values.

REFERENCE:
See here if you want to be a mathematician ;-).
http://en.wikipedia.org/wiki/Primality_test

THE CODE:

I would assume you know how to deal with lists in c# so I
will not get into that. Just create an integer based items
list "list<int>" etc. in C# which adds digits to the list
till number n. HINT: use a for loop ...LOL!!

public void CountPrimes(list<int> c)
{
list<int> primes = c.FindAll(
delegate(int a)
for (int i = 2; i <= Math.Sqrt(a); i++)
{
if (a % i == 0)
return false; //is not a prime
return true;//is a prime
}
//list primes in a list box and get the total count
label1.Text = "Total Primes = " + Convert.ToString
(p.count);
for (int count = 2; count < p.count; count++)
{
listbox.Items.Add(Convert.ToString(p[i]));
}
}

and you are done!!! let me know if this is good enough...

Please, i am a final year student in nigeria and i have a project on pension fund administration and i need help in starting.

0 Answers  

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can any body help me to know the procedure followed by programmer/developer inorder to develop a project. what are the steps, how he/she get the SRS,technical document??how does he submit his wotk to TL/PM/Business Analyst?? How does these documents review?? how the developer starts coding? how does he deploy his coding in server? in which server he will deploy?? what are the important document a developer should have??? Pls give me a real time scenario of development process, how it is going on in a company???? Thanks in advance

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