#Percent that two people have a birthday within a day of each other.

1 messages · Page 1 of 1 (latest)

plush fractalBOT
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<@&987246399047479336> please have a look, thanks.

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day of each other. Here's a simple Java program that calculates this probability:

import java.util.Random;

public class BirthdayProbability {
    public static void main(String[] args) {
        int simulations = 1000000; // Number of simulations to run
        int count = 0; // Counter for successful simulations

        for (int i = 0; i < simulations; i++) {
            if (hasSameBirthday()) {
                count++;
            }
        }

        double probability = (double) count / simulations * 100;
        System.out.println("Probability of two people having a birthday within a day of each other: " + probability + "%");
    }

    public static boolean hasSameBirthday() {
        Random random = new Random();
        int[] birthdays = new int[365]; // Array to store birthdays

        for (int i = 0; i < 2; i++) { // Generate birthdays for two people
            int birthday = random.nextInt(365);
            if (birthdays[birthday] == 1) { // Check if the birthday is already taken
                return true;
            }
            birthdays[birthday] = 1;
        }

        return false;
    }
}

In this program, we use a Monte Carlo simulation approach to estimate the probability. We run a large number of simulations (in this case, 1 million) and count the number of successful simulations where two people have a birthday within a day of each other.

The hasSameBirthday() method generates random birthdays for two people and stores them in an array. If a generated birthday is already taken, it means that two people have the same birthday or their birthdays are within a day of each other.

Finally, we calculate the probability by dividing the count of successful simulations by the total number of simulations and multiply by 100 to get the percentage.

Hope this helps! Let me know if you have any further questions.

winter crag
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what are the results you expect?

lime citrus
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I posted the results that I get in the initial posting but I do not think they are correct

winter crag
lime citrus
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do you think the code is correct?

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I just wish that someone with more experience than me in coding, can have a look and give a feedback 🙂

autumn mirage
# lime citrus do you think the code is correct?

I can't exactly get what you're trying to do? the probability of 2 people having the same day as their birthday is always 365*(1/365)^2? assuming that it's an equal chances, it could be different if you have data about each how common each day could be a birthday.

winter crag
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that's a basic, understanding what your code should do