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Thread: Finding nth prime number
 04122010, 11:47 PM #1Member
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Finding nth prime number
I am trying to write a code for a program that will find the n th prime number.As for example 7 is the 4th prime number,11 is the 5th.
The method will take argument as n,and it will find the nth prime number.But I am facing some difficulty with the code.The code doesnt terminate by itself and doesnt return the desired value.Someone please help me out.
Java Code:public class Problem{ /** * @param args */ public int findAns(int n){ int count=0; int ret=0; while(count<n){ for(int i=0;i<Integer.MAX_VALUE;i++){ if(ifPrime(i)){ count++; } ret=i; } } return ret; } public boolean ifPrime(int num){ boolean b=false; int i; for (i=2; i < num ;i++ ){ int n = num%i; if (n==0){ b=false; break; } } if(i == num){ b=true; } return b; } public static void main(String[] args) { // TODO Autogenerated method stub System.out.println(new Problem().findAns(10)); } }

Are you sure that you want both a for loop and a while loop here:
Java Code:while(count<n){ for(int i=0;i<Integer.MAX_VALUE;i++){ if(ifPrime(i)){ count++; } ret=i; } }
 04132010, 12:42 AM #3Senior Member
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