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pamela bolla
Java prime number program
1 Answer(s)      6 years and 9 months ago
Posted in : Java Beginners


How to show the prime number in Java? Can you please explain it through an example?


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April 12, 2008 at 7:10 PM


Hi friend,

public class Ex01 {
public static void main(String[] args){
int power_of_two = 2;
for(int n=2; n<31; n++) {
int mersenne = power_of_two - 1;
if (AePrimeExample.checkPrime(mersenne)) {
System.out.print("Found Mersenne prime: ");
System.out.print(mersenne);
System.out.println(" (n = " + String.valueOf(n) + ")");
}
power_of_two *= 2;
}
}
}



public class AePrimeExample {
public static boolean checkPrime(int n){
int primes25[] = {2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,
73,79,83,89,97};
for(int i=0;i<25;i++) {
if (n%primes25[i] == 0) {
if(n == primes25[i]) {
return true;
}
else{
return false;
}
}
}
int maxtest = n/4;

for(int i=259; i<maxtest; i+=2)
if (n%i == 0)
return false;

return true;
}
}
----------------------------
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