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Merge pull request #701 from IvanKuzaev/patch-1

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Update PalindromicPrime.java
This commit is contained in:
Libin Yang
2019-02-03 16:53:24 +08:00
committed by GitHub
parent 46a384b4ba 22e7f7f147
commit f869601a94
1 changed files with 21 additions and 18 deletions
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29
Misc/PalindromicPrime.java
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@ -1,15 +1,16 @@
import java.util.Scanner; import java.util.Scanner;
public class PalindromePrime { public class PalindromePrime {
public static void main(String[] args) { // Main funtion public static void main(String[] args) { // Main funtion
Scanner in = new Scanner(System.in); Scanner in = new Scanner(System.in);
System.out.println("Enter the quantity of First Palindromic Primes you want"); System.out.println("Enter the quantity of First Palindromic Primes you want");
int n = in.nextInt(); // Input of how mant first pallindromic prime we want int n = in.nextInt(); // Input of how many first pallindromic prime we want
funtioning(n); // calling funtion - functioning functioning(n); // calling function - functioning
} }
public static boolean prime(int num) { // checking if number is prime or not public static boolean prime(int num) { // checking if number is prime or not
for (int divisor = 2; divisor <= num / 2; divisor++) { for (int divisor = 3; divisor <= Math.sqrt(num); divisor += 2) {
if (num % divisor == 0) { if (num % divisor == 0) {
return false; // false if not prime return false; // false if not prime
} }
@ -20,22 +21,24 @@ public class PalindromePrime {
public static int reverse(int n) { // Returns the reverse of the number public static int reverse(int n) { // Returns the reverse of the number
int reverse = 0; int reverse = 0;
while(n != 0) { while(n != 0) {
reverse = reverse * 10; reverse *= 10;
reverse = reverse + n%10; reverse += n%10;
n = n/10; n /= 10;
} }
return reverse; return reverse;
} }
public static void funtioning(int y){ public static void functioning(int y) {
int count =0; if (y == 0) return;
int num = 2; System.out.print(2 + "\n"); // print the first Palindromic Prime
int count = 1;
int num = 3;
while(count < y) { while(count < y) {
if(prime(num) && num == reverse(num)){ // number is prime and it's reverse is same if(num == reverse(num) && prime(num)) { // number is prime and it's reverse is same
count++; // counts check when to terminate while loop count++; // counts check when to terminate while loop
System.out.print(num + "\n"); // Print the Palindromic Prime System.out.print(num + "\n"); // print the Palindromic Prime
}
num += 2; // inrease iterator value by two
} }
num++; // inrease iterator value by one
} }
} }
};