Java program to check whether number is prime or not code example
Example 1: making list of prime numbers java
Now let’s see print first 10 prime numbers in java.
public class FirstTenPrimeNumbers
{
public static void main(String[] args)
{
int count = 0, number = 0, a = 1, b = 1;
while(number < 10)
{
b = 1;
count = 0;
while(b <= a)
{
if(a%b == 0)
count++;
b++;
}
if(count == 2)
{
System.out.printf("%d ", a);
number++;
}
a++;
}
}
}
Example 2: prime in java
public class Prime {
public static void main(String[] args) {
int num = 29;
boolean flag = false;
for(int i = 2; i <= num/2; ++i){
if(num % i == 0){
flag = true;
break;
}
}
if (!flag)
System.out.println(num + " is a prime number.");
else
System.out.println(num + " is not a prime number.");
}}
Source:www.progra
Example 3: program to know if a number is prime
#include<bits/stdc++.h>
using namespace std;
bool Is_Prime(long long x){
if(x%2==0)return false;
for(int i=3;i*i<=x;i+=2)
if(x%i==0)return false;
return true;
}
int main(){
long long x;
cin>>x;
if(Is_Prime(x))cout<<"Is Prime";
else cout<<"Is not Prime";
}
Example 4: checking if a given integer is a prime number java
public class Prime {
public static void main(String[] args) {
int num = 29;
boolean flag = false;
for(int i = 2; i <= num/2; ++i)
{
if(num % i == 0)
{
flag = true;
break;
}
}
if (!flag)
System.out.println(num + " is a prime number.");
else
System.out.println(num + " is not a prime number.");
}
}
Example 5: Java program to check whether number is prime or not
public class PrimeNumberInJava
{
public static void main(String[] args)
{
int a, b = 0, flag = 0;
int number = 66;
b = number / 2;
if(number == 0 || number == 1)
{
System.out.println(number + " is not prime number");
}
else
{
for(a = 2; a <= b; a++)
{
if(number % a == 0)
{
System.out.println(number + " is not prime number.");
flag = 1;
break;
}
}
if(flag == 0)
{
System.out.println(number + " is prime number.");
}
}
}
}