Pirminis skaičius Java: pirminis skaičius yra skaičius, didesnis už 1 ir padalintas iš 1 arba tik pats. Kitaip tariant, pirminiai skaičiai negali būti padalyti iš kitų skaičių nei jis pats arba 1. Pavyzdžiui, 2, 3, 5, 7, 11, 13, 17... yra pirminiai skaičiai.

Pastaba: 0 ir 1 nėra pirminiai skaičiai. 2 yra vienintelis lyginis pirminis skaičius, nes visi kiti lyginiai skaičiai gali būti padalyti iš 2.

Pažiūrėkime pirminių skaičių programą Java. Šioje „Java“ programoje paimsime skaičių kintamąjį ir patikrinsime, ar skaičius yra pirminis, ar ne.

 public class PrimeExample{ public static void main(String args[]){ int i,m=0,flag=0; int n=3;//it is the number to be checked m=n/2; if(n==0||n==1){ System.out.println(n+&apos; is not prime number&apos;); }else{ for(i=2;i<=m;i++){ if(n%i="=0){" system.out.println(n+' is not prime number'); flag="1;" break; } if(flag="=0)" { end of else < pre> <span> Test it Now </span> <p>Output:</p> <pre> 3 is prime number </pre> <h2>Prime Number Program using Method in Java</h2> <pre> public class PrimeExample2{ static void checkPrime(int n){ int i,m=0,flag=0; m=n/2; if(n==0||n==1){ System.out.println(n+&apos; is not prime number&apos;); }else{ for(i=2;i<=m;i++){ if(n%i="=0){" system.out.println(n+' is not prime number'); flag="1;" break; } if(flag="=0)" { end of else public static void main(string args[]){ checkprime(1); checkprime(3); checkprime(17); checkprime(20); < pre> <span> Test it Now </span> <p>Output:</p> <pre> 1 is not prime number 3 is prime number 17 is prime number 20 is not prime number </pre> <h2>Prime Number Program in Java (Another way)</h2> <p>You can also use a method where number is not predefined. Here, user has to put the number to check if the number is prime.</p> <pre> import java.util.Scanner; import java.util.Scanner; public class PrimeExample3 { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print(&apos;Enter a number : &apos;); int n = s.nextInt(); if (isPrime(n)) { System.out.println(n + &apos; is a prime number&apos;); } else { System.out.println(n + &apos; is not a prime number&apos;); } } public static boolean isPrime(int n) { if (n <= 1) { return false; } for (int i="2;" < math.sqrt(n); i++) if (n % 0) true; pre> <p>Output:</p> <strong>Use image PrimeExample1</strong> <h2>Find prime numbers between two numbers</h2> <p>You can also find prime numbers between two specified numbers.</p> <pre> import java.util.Scanner; public class PrimeExample4 { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print(&apos;Enter the first number : &apos;); int start = s.nextInt(); System.out.print(&apos;Enter the second number : &apos;); int end = s.nextInt(); System.out.println(&apos;List of prime numbers between &apos; + start + &apos; and &apos; + end); for (int i = start; i <= end; i++) { if (isprime(i)) system.out.println(i); } public static boolean isprime(int n) (n <="1)" return false; for (int i="2;" % 0) true; pre> <p>Output:</p> <strong>Use image PrimeExample2</strong> </=></pre></=></pre></=m;i++){></pre></=m;i++){>

Pirminio skaičiaus programa naudojant metodą Java

 public class PrimeExample2{ static void checkPrime(int n){ int i,m=0,flag=0; m=n/2; if(n==0||n==1){ System.out.println(n+&apos; is not prime number&apos;); }else{ for(i=2;i<=m;i++){ if(n%i="=0){" system.out.println(n+\' is not prime number\'); flag="1;" break; } if(flag="=0)" { end of else public static void main(string args[]){ checkprime(1); checkprime(3); checkprime(17); checkprime(20); < pre> <span> Test it Now </span> <p>Output:</p> <pre> 1 is not prime number 3 is prime number 17 is prime number 20 is not prime number </pre> <h2>Prime Number Program in Java (Another way)</h2> <p>You can also use a method where number is not predefined. Here, user has to put the number to check if the number is prime.</p> <pre> import java.util.Scanner; import java.util.Scanner; public class PrimeExample3 { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print(&apos;Enter a number : &apos;); int n = s.nextInt(); if (isPrime(n)) { System.out.println(n + &apos; is a prime number&apos;); } else { System.out.println(n + &apos; is not a prime number&apos;); } } public static boolean isPrime(int n) { if (n <= 1) { return false; } for (int i="2;" < math.sqrt(n); i++) if (n % 0) true; pre> <p>Output:</p> <strong>Use image PrimeExample1</strong> <h2>Find prime numbers between two numbers</h2> <p>You can also find prime numbers between two specified numbers.</p> <pre> import java.util.Scanner; public class PrimeExample4 { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print(&apos;Enter the first number : &apos;); int start = s.nextInt(); System.out.print(&apos;Enter the second number : &apos;); int end = s.nextInt(); System.out.println(&apos;List of prime numbers between &apos; + start + &apos; and &apos; + end); for (int i = start; i <= end; i++) { if (isprime(i)) system.out.println(i); } public static boolean isprime(int n) (n <="1)" return false; for (int i="2;" % 0) true; pre> <p>Output:</p> <strong>Use image PrimeExample2</strong> </=></pre></=></pre></=m;i++){>

Pirminio skaičiaus programa „Java“ (kitas būdas)

Taip pat galite naudoti metodą, kai skaičius nėra iš anksto nustatytas. Čia vartotojas turi įdėti skaičių, kad patikrintų, ar skaičius yra pirminis.

 import java.util.Scanner; import java.util.Scanner; public class PrimeExample3 { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print(&apos;Enter a number : &apos;); int n = s.nextInt(); if (isPrime(n)) { System.out.println(n + &apos; is a prime number&apos;); } else { System.out.println(n + &apos; is not a prime number&apos;); } } public static boolean isPrime(int n) { if (n <= 1) { return false; } for (int i="2;" < math.sqrt(n); i++) if (n % 0) true; pre> <p>Output:</p> <strong>Use image PrimeExample1</strong> <h2>Find prime numbers between two numbers</h2> <p>You can also find prime numbers between two specified numbers.</p> <pre> import java.util.Scanner; public class PrimeExample4 { public static void main(String[] args) { Scanner s = new Scanner(System.in); System.out.print(&apos;Enter the first number : &apos;); int start = s.nextInt(); System.out.print(&apos;Enter the second number : &apos;); int end = s.nextInt(); System.out.println(&apos;List of prime numbers between &apos; + start + &apos; and &apos; + end); for (int i = start; i <= end; i++) { if (isprime(i)) system.out.println(i); } public static boolean isprime(int n) (n <="1)" return false; for (int i="2;" % 0) true; pre> <p>Output:</p> <strong>Use image PrimeExample2</strong> </=></pre></=>