Java Number Programs (ICSE Classes 9 / 10)
A prime number is said to be 'Twisted Prime', if the new number obtained after reversing the digits is also a prime number. Write a program to accept a number and check whether the number is 'Twisted Prime' or not.
Sample Input: 167
Sample Output: 761
167 is a 'Twisted Prime'.
Java
Java Iterative Stmts
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Answer
import java.util.Scanner;
public class KboatTwistedPrime
{
public void twistedPrimeCheck() {
Scanner in = new Scanner(System.in);
System.out.print("Enter number: ");
int num = in.nextInt();
if (num == 1) {
System.out.println(num + " is not a twisted prime number");
}
else {
boolean isPrime = true;
for (int i = 2; i <= num / 2; i++) {
if (num % i == 0) {
isPrime = false;
break;
}
}
if (isPrime) {
int t = num;
int revNum = 0;
while (t != 0) {
int digit = t % 10;
t /= 10;
revNum = revNum * 10 + digit;
}
for (int i = 2; i <= revNum / 2; i++) {
if (revNum % i == 0) {
isPrime = false;
break;
}
}
}
if (isPrime)
System.out.println(num + " is a twisted prime number");
else
System.out.println(num + " is not a twisted prime number");
}
}
}
Variable Description Table
Program Explanation
Output
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