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Reverse Prime
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//'main' method must be in a class 'Rextester'. //openjdk version '11.0.5' import java.util.*; import java.lang.*; class Rextester { public static void main(String args[]) { Scanner sc=new Scanner(System.in); int[] arr={13,63,37,47,69}; for(int i=0;i<arr.length;i++){ int rev=0,temp=0; if(isprime(arr[i])){ temp=arr[i]; while(temp>0){ rev=(rev*10)+temp%10; temp=temp/10; } if(isprime(rev)){ System.out.println(arr[i]+" is reverse prime."); } } } } public static boolean isprime(int n){ boolean res=true; for(int i=2;i<=n/2;i++){ if(n%i==0){ res=false; break; } } return res; } }
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Compilation time: 1.13 sec, absolute running time: 0.31 sec, cpu time: 0.27 sec, memory peak: 38 Mb, absolute service time: 1,53 sec
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13 is reverse prime. 37 is reverse prime.
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