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Program to determine whether a given number is a twisted prime number

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robaa
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2022-11-08
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A number is called a twisted prime number if it is a prime number and reverse of this number is also a prime number.

Examples: 2, 3, 5, 7, 11, 13, 17, 31, 37, 71, 73, 79

The algorithm to check whether a given number is a twisted prime number is given below.

Algorithm

  • STEP 1: START
  • STEP 2: DEFINE n, reverse, flag
  • STEP 3: SET sum = 0
  • STEP 4: ENTER n
  • STEP 5: REPEAT STEP 6 to 8 UNTIL (n!=0)
  • STEP 6: reverse = n%10
  • STEP 7: sum = sum*10 + reverse
  • STEP 8: n = n/10
  • STEP 9: SET flag =0
  • STEP 10: REPEAT STEP 11 UNTIL j<=sum/2
  • STEP 11: if(sum%j)==0
    then
    set flag = 1
    break
  • STEP 12: if(flag==0)
    then PRINT "yes"
    else
    PRINT "no"
  • STEP 13: END
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All Answers

robaa
2022-11-08
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Java Program

import java.util.*;  
class Twisted_Prime   
{  
    public static void main(String[] args)  
    {  
              
    int n, reverse,sum=0 , flag;  
    Scanner sc = new Scanner(System.in);      
    System.out.println("Enter the prime number?");  
    n = sc.nextInt();  
  
        while(n!=0)  
        {  
        reverse = n%10;  
        sum = sum*10 + reverse;  
        n= n/10;  
        }  
        
    flag = 0;  
    for (int j = 2; j <= sum / 2; j++)  
    {  
        if ((sum % j) == 0)  
        {  
            flag = 1;  
            break;  
        }  
    }  
    if (flag == 0)  
            System.out.println("Twisted Prime");  
     else  
            System.out.println("Not Twisted Prime");  
}  
}

 

Output:

Enter the prime number?
43
Not Twisted Prime

 

Python Program

n=int(input("Enter the prime number?"))  
rev=0  
flag=0  
while(n>0):  
    dig=n%10  
    rev=rev*10+dig  
    n=n//10  
for j in range(2, rev//2):  
    if ((rev % j) == 0):  
        flag = 1  
        break  
if (flag == 0):  
    print("Twisted Prime")  
else:  
    print("Not Twisted Prime")

 

Output:

Enter the prime number?
13
Twisted Prime

 

C Program

#include <stdio.h>  
int main()  
{  
  int n, reverse,sum=0 , flag;  
  printf("Enter the prime number?");  
  scanf("%d",&n);  
while(n!=0)  
    {  
        reverse = n%10;  
        sum = sum*10 + reverse;  
        n= n/10;  
    }  
       
        printf("\n");  
    flag = 0;  
    for (int j = 2; j <= sum / 2; j++)  
    {  
        if ((sum % j) == 0)  
        {  
            flag = 1;  
            break;  
        }  
    }  
    if (flag == 0)  
            printf("Twisted Prime");  
     else  
            printf("Not Twisted Prime");  
  
}

 

Output:

Enter the prime number?
11
Twisted Prime

 

C# program

using System;   
public class PrimeNumber  
{  
   public static void Main()  
    {  
      
        int n, reverse,sum=0 , flag;  
       Console.WriteLine("Enter the prime number?");  
       n = Convert.ToInt32(Console.ReadLine());  
         
while(n!=0)  
    {  
        reverse = n%10;  
        sum = sum*10 + reverse;  
        n= n/10;  
    }  
         
    flag = 0;  
    for (int j = 2; j <= sum / 2; j++)  
    {  
        if ((sum % j) == 0)  
        {  
            flag = 1;  
            break;  
        }  
    }  
    if (flag == 0)  
            Console.WriteLine("Twisted Prime");  
     else  
            Console.WriteLine("Not Twisted Prime");  
}}

 

Output:

            Enter the prime number?
            13
            Twisted Prime

 

PHP Program

<?php  
echo "Enter the prime number?";  
$n=readline();  
$sum=0;  
    while($n!=0)  
        {  
        $reverse = $n%10;  
        $sum = $sum*10 + $reverse;  
        $n= $n/10;  
        }  
    $flag = 0;  
    for ($j = 2; $j <= $sum / 2; $j++)  
    {  
        if (($sum % $j) == 0)  
        {  
            $flag = 1;  
            break;  
        }  
    }  
    if ($flag == 0)  
          echo ("Twisted Prime");  
     else  
        echo("Not Twisted Prime");  
?>

 

Output:

             Enter the prime number?
             17
             Twisted Prime

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