CareerCup

in java Math.random() generates values between 0 to <1 with almost equal distribution over large no of iterations... since it is so the following code could work

if(Math.random()<0.67)
	System.out.print("Heads");
else
	System.out.print("Tails");

import random
def simulateBiasedCoin(p):
  if random.randint(1,100) < p*100:
    return "Heads"
  else:
    return "Tails"
simulateBiasedCoin(0.67)

Sample code

public class BiasedProb {

	public static void main(String[] args) {
		BiasedProb biased = new BiasedProb();
		double prob = 0.67;
		int count = 1000000;
		int appear = 0;
		for(int i=0;i<1000000;i++){
			if(biased.biased(prob)){
				appear++;
			}
		}
		System.out.println(((double)appear)/count);
	}
	
	public boolean biased(double prob){
		double randVal =  Math.random();
		return randVal<prob;
	}

}