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Thread: Prime numbers
- 01-31-2008, 01:27 PM #1
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- 01-31-2008, 08:47 PM #2
Spoiler
Hello gapper
Here's a spoiler:
Java Code:public class Prime{ protected Vector<Integer> getFactors(int integer){ Vector<Integer> result = new Vector<Integer>(); for (int i = 1; i <= integer; i++) if (integer % i == 0) result.add(new Integer(i)); return result; } public Prime(int bound){ System.out.println("Prime numbers up to " + bound + ":"); for (int i = 2; i <= bound; i++){ if (getFactors(i).size() == 2) System.out.println(i); } } }
Java Code:new Prime(20);
Java Code:Prime numbers up to 20: 2 3 5 7 11 13 17 19
Eyes dwelling into the past are blind to what lies in the future. Step carefully.
- 02-05-2008, 08:04 AM #3
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class PrimeNumbers
{
public static void main(String[] args)
{
int i,j;
i=1;
while(i<=1000)
{
j=2;
while(j<=i-1)
{
if(i%j==0) break;
j++;
}
if(i==j)
System.out.print(i);
i++;
}
}
}
- 02-07-2008, 10:09 AM #4
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prime number....
public class PrimeNumber
{
public static void main(String[] args)
{
prime pr = new prime();
int number=Integer.parseInt(args[0]);
int[] primeNum=pr.primeNumbers(number);
System.out.print("PRIME numbers are:");
for (int k = 0; k< primeNum.length; k++)
{
System.out.print(" "+primeNum[k]);
}
}
}
public class prime
{
int[] primeNumbers(int primeno)
{
int factCount=0;
int result[]=new int[4];
int k=0;
int j=0;
while(j<=primeno)
{
for(int i=2;i<=j;i++)
{
if(j%i==0)
{
factCount++;
}
}
if(factCount==1)
{
result[k]=j;
k++;
}
else
{
}
j++;
factCount=0;
}
return result;
}
}
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