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Code Probability

Generate a random n bit binary string

A binary string is a sequence of 0s and 1s. To generate a random n bit binary string, we need to randomly select a value of either 0 or 1 for each bit position in the string. Here are some steps that we can follow to generate a random n bit binary string:

  1. First, we need to decide on the value of n. This is the number of bits in the binary string that we want to generate.

  2. We can use a random number generator to generate a sequence of n random numbers. Each random number should be either 0 or 1 with equal probability.

  3. We can then convert the sequence of random numbers into a binary string. To do this, we can iterate through the sequence of random numbers and append either "0" or "1" to a new string for each number. For example, if the sequence of random numbers is [1, 0, 1, 1], we can convert this to the binary string "1011".

  4. Finally, we can return the binary string as the output of our function.

Code Example

/*
    C Program 
    Generate a random n bit binary string
*/
#include <stdio.h>
#include <time.h>
#include <stdlib.h>

void randomBinaryText(int n)
{
	if (n <= 0)
	{
		return;
	}
	// Use to collect result
	char record[n + 1];
	for (int i = 0; i < n; ++i)
	{
		// Collect the random number
		record[i] = '0' + ((rand()) % 2);
	}
	record[n] = '\0';
	// Display given number
	printf("\n Given n : %d", n);
	// Print the generated number
	printf("\n Result  : %s\n", record);
}
int main()
{
	srand(time(NULL));
	// Test
	randomBinaryText(12);
	randomBinaryText(8);
	randomBinaryText(18);
	return 0;
}

Output

 Given n : 12
 Result  : 110100110100

 Given n : 8
 Result  : 01010011

 Given n : 18
 Result  : 111011011010100101
/*
    Java Program 
    Generate a random n bit binary string
*/
import java.util.Random;
public class RandomNumber
{
	public int absValue(int v)
	{
		if (v < 0)
		{
			return -v;
		}
		return v;
	}
	public void randomBinaryText(int n)
	{
		if (n <= 0)
		{
			return;
		}
		Random rand = new Random();
		// Use to collect result
		String result = "";
		for (int i = 0; i < n; ++i)
		{
			// Collect the random number
			result = (absValue(rand.nextInt() % 2)) + result;
		}
		// Display given number
		System.out.print("\n Given n : " + n);
		// Print the generated number
		System.out.println("\n Result : " + result);
	}
	public static void main(String[] args)
	{
		RandomNumber task = new RandomNumber();
		// Test
		task.randomBinaryText(12);
		task.randomBinaryText(8);
		task.randomBinaryText(18);
	}
}

Output

 Given n : 12
 Result : 100100000110

 Given n : 8
 Result : 10001001

 Given n : 18
 Result : 010000011110100001
// Include header file
#include <iostream>
#include<time.h>
#include<stdlib.h>
using namespace std;
class RandomNumber
{
	public: int absValue(int v)
	{
		if (v < 0)
		{
			return -v;
		}
		return v;
	}
	void randomBinaryText(int n)
	{
		if (n <= 0)
		{
			return;
		}

		// Use to collect result
		string result = "";
		for (int i = 0; i < n; ++i)
		{
			// Collect the random number
			result = to_string(rand() % 2)  +  result;
		}
		// Display given number
		cout << "\n Given n : " << n;
		// Print the generated number
		cout << "\n Result : " << result << endl;
	}
};
int main()
{
  	srand(time(NULL));
	RandomNumber *task = new RandomNumber();
	// Test
	task->randomBinaryText(12);
	task->randomBinaryText(8);
	task->randomBinaryText(18);
	return 0;
}

Output

 Given n : 12
 Result : 001000000110

 Given n : 8
 Result : 10101011

 Given n : 18
 Result : 100000000010100101
// Include namespace system
using System;
public class RandomNumber
{
	public int absValue(int v)
	{
		if (v < 0)
		{
			return -v;
		}
		return v;
	}
	public void randomBinaryText(int n)
	{
		if (n <= 0)
		{
			return;
		}
		Random rand = new Random();
		// Use to collect result
		String result = "";
		for (int i = 0; i < n; ++i)
		{
			// Collect the random number
			result = (this.absValue(rand.Next() % 2)) + result;
		}
		// Display given number
		Console.Write("\n Given n : " + n);
		// Print the generated number
		Console.WriteLine("\n Result : " + result);
	}
	public static void Main(String[] args)
	{
		RandomNumber task = new RandomNumber();
		// Test
		task.randomBinaryText(12);
		task.randomBinaryText(8);
		task.randomBinaryText(18);
	}
}

Output

 Given n : 12
 Result : 111110100000

 Given n : 8
 Result : 11001000

 Given n : 18
 Result : 011011100111000110
package main
import ( 
    "fmt"
    "math/rand"
    "math"
    "time"
    "strconv"
) 
/*
    Go Program 
    Generate a random n bit binary string
*/
type RandomNumber struct {}
func getRandomNumber() * RandomNumber {
	var me *RandomNumber = &RandomNumber {}
	return me
}
func(this RandomNumber) absValue(v int) int {
	if v < 0 {
		return -v
	}
	return v
}
func(this RandomNumber) randomBinaryText(n int) {
	if n <= 0 {
		return
	}
	rand.Seed(time.Now().UnixNano())
	// Use to collect result
	var result string = ""
	for i := 0 ; i < n ; i++ {
		// Collect the random number
		result = strconv.Itoa(rand.Intn(math.MaxInt64-1) % 2) + result
	}
	// Display given number
	fmt.Print("\n Given n : ", n)
	// Print the generated number
	fmt.Println("\n Result : ", result)
}
func main() {
	var task * RandomNumber = getRandomNumber()
	// Test
	task.randomBinaryText(12)
	task.randomBinaryText(8)
	task.randomBinaryText(18)
}

Output

 Given n : 12
 Result :  110011110001

 Given n : 8
 Result :  01010000

 Given n : 18
 Result :  111010111111011010

<?php
class RandomNumber
{

	public	function randomBinaryText($n)
	{
		if ($n <= 0)
		{
			return;
		}
		// Use to collect result
		$result = "";
		for ($i = 0; $i < $n; ++$i)
		{
			// Collect the random number
			$result = strval(rand() % 2).$result;
		}
		// Display given number
		echo("\n Given n : ".$n);
		// Print the generated number
		echo("\n Result : ".$result.
			"\n");
	}
}

function main()
{
	$task = new RandomNumber();
	// Test
	$task->randomBinaryText(12);
	$task->randomBinaryText(8);
	$task->randomBinaryText(18);
}
main();

Output

 Given n : 12
 Result : 110010010001

 Given n : 8
 Result : 10001011

 Given n : 18
 Result : 101100100001111100
/*
    Node JS Program 
    Generate a random n bit binary string
*/
class RandomNumber
{
	randomBinaryText(n)
	{
		if (n <= 0)
		{
			return;
		}
	
		// Use to collect result
		var result = "";
		for (var i = 0; i < n; ++i)
		{
			// Collect the random number
			result = ((Math.floor(Math.random() * (100)) + 2) % 2) + result;
		}
		// Display given number
		process.stdout.write("\n Given n : " + n);
		// Print the generated number
		console.log("\n Result : " + result);
	}
}

function main()
{
	var task = new RandomNumber();
	// Test
	task.randomBinaryText(12);
	task.randomBinaryText(8);
	task.randomBinaryText(18);
}
main();

Output

 Given n : 12
 Result : 111001011111

 Given n : 8
 Result : 01100101

 Given n : 18
 Result : 110011010111100011
import random
import sys
#    Python 3 Program 
#    Generate a random n bit binary string
class RandomNumber :
	def randomBinaryText(self, n) :
		if (n <= 0) :
			return
		
		#  Use to collect result
		result = ""
		i = 0
		while (i < n) :
			#  Collect the random number
			result = str(random.randint(0,sys.maxsize-2)%2) + result
			i += 1
		
		#  Display given number
		print("\n Given n : ", n, end = "")
		#  Print the generated number
		print("\n Result : ", result)
	

def main() :
	task = RandomNumber()
	#  Test
	task.randomBinaryText(12)
	task.randomBinaryText(8)
	task.randomBinaryText(18)

if __name__ == "__main__": main()

Output

 Given n :  12
 Result :  101011001110

 Given n :  8
 Result :  01001011

 Given n :  18
 Result :  101101000100111111
#    Ruby Program 
#    Generate a random n bit binary string
class RandomNumber 

	def randomBinaryText(n) 
		if (n <= 0) 
			return
		end

		r = Random.new
		max_int = (2**(0.size * 8 -2) -1)
		#  Use to collect result
		result = ""
		i = 0
		while (i < n) 
			#  Collect the random number
			result = (r.rand(0...max_int) % 2).to_s + result
			i += 1
		end

		#  Display given number
		print("\n Given n : ", n)
		#  Print the generated number
		print("\n Result : ", result, "\n")
	end

end

def main() 
	task = RandomNumber.new()
	#  Test
	task.randomBinaryText(12)
	task.randomBinaryText(8)
	task.randomBinaryText(18)
end

main()

Output

 Given n : 12
 Result : 111101111010

 Given n : 8
 Result : 10011100

 Given n : 18
 Result : 100100010000111011

/*
    Scala Program 
    Generate a random n bit binary string
*/
class RandomNumber()
{
	def absValue(v: Int): Int = {
		if (v < 0)
		{
			return -v;
		}
		return v;
	}
	def randomBinaryText(n: Int): Unit = {
		if (n <= 0)
		{
			return;
		}
		val r = new scala.util.Random;
		// Use to collect result
		var result: String = "";
		var i: Int = 0;
		while (i < n)
		{
			// Collect the random number
			result = (absValue(r.nextInt() % 2)).toString() + result;
			i += 1;
		}
		// Display given number
		print("\n Given n : " + n);
		// Print the generated number
		println("\n Result : " + result);
	}
}
object Main
{
	def main(args: Array[String]): Unit = {
		var task: RandomNumber = new RandomNumber();
		// Test
		task.randomBinaryText(12);
		task.randomBinaryText(8);
		task.randomBinaryText(18);
	}
}

Output

 Given n : 12
 Result : 111101010000

 Given n : 8
 Result : 11011101

 Given n : 18
 Result : 011100011110001000
import Foundation

#if os(Linux)
    srandom(UInt32(time(nil)))
#endif
/*
    Swift 4 Program 
    Generate a random n bit binary string
*/
class RandomNumber
{
	func absValue(_ v: Int) -> Int
	{
		if (v < 0)
		{
			return -v;
		}
		return v;
	}
	func randomBinaryText(_ n: Int)
	{
		if (n <= 0)
		{
			return;
		}
		var number = 0;
      	let max = UInt8.max-1 ;
		// Use to collect result
		var result: String = "";
		var i: Int = 0;
		while (i < n)
		{
          	//Get new rand number
			#if os(Linux)
              number = Int(random()) 
            #else
              number = Int(arc4random_uniform(UInt32(max)))
            #endif
			// Collect the random number
			result = String(number%2) + result;
			i += 1;
		}
		// Display given number
		print("\n Given n : ", n, terminator: "");
		// Print the generated number
		print("\n Result : ", result);
	}
}
func main()
{
	let task: RandomNumber = RandomNumber();
	// Test
	task.randomBinaryText(12);
	task.randomBinaryText(8);
	task.randomBinaryText(18);
}
main();

Output

 Given n :  12
 Result :  100001111111

 Given n :  8
 Result :  10100110

 Given n :  18
 Result :  101111000000010110
/*
    Kotlin Program 
    Generate a random n bit binary string
*/
import kotlin.random.Random
class RandomNumber
{
	fun absValue(v: Int): Int
	{
		if (v < 0)
		{
			return -v;
		}
		return v;
	}
	fun randomBinaryText(n: Int): Unit
	{
		if (n <= 0)
		{
			return;
		}
		// Use to collect result
		var result: String = "";
		var i: Int = 0;
		while (i < n)
		{
			// Collect the random number
			result = (absValue(Random(
              System.nanoTime()).nextInt()) % 2
            ).toString() + result;
			i += 1;
		}
		// Display given number
		print("\n Given n : " + n);
		// Print the generated number
		println("\n Result : " + result);
	}
}
fun main(args: Array < String > ): Unit
{
	val task: RandomNumber = RandomNumber();
	// Test
	task.randomBinaryText(12);
	task.randomBinaryText(8);
	task.randomBinaryText(18);
}

Output

 Given n : 12
 Result : 101001110011

 Given n : 8
 Result : 01010001

 Given n : 18
 Result : 100001111100001110

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