Display prime numbers from 1 to 100 in java

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Display prime numbers from 1 to 100 in java

Display prime numbers from 1 to 100 in java

Here’s the prime numbers from 1 to 100,

Also read – prime number java

public class PrimeNumbersJava
{
public static void main(String[] args)
{
int a = 0;
int number = 0;
String strPrimeNumber = "";
for(a = 1; a <= 100; a++)
{
int counter = 0;
for(number = a; number >= 1; number--)
{
if(a % number == 0)
{
counter = counter + 1;
}
}
if(counter == 2)
{
strPrimeNumber = strPrimeNumber + a + " ";
}
}
System.out.println("Prime numbers from 1 to 100 : ");
System.out.println(strPrimeNumber);
}
}

Output:

Prime numbers from 1 to 100 : 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

Similarly we can display from 1 to n,

import java.util.Scanner;

public class PrimeNumber
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
int a = 0;
int number = 0;
String strPrimeNumber = "";
System.out.println("Please enter the value of n : ");
int n = sc.nextInt();
for(a = 1; a <= n; a++)
{
int count = 0;
for(number = a; number >= 1; number--)
{
if(a % number == 0)
{
count = count + 1;
}
}
if(count == 2)
{
strPrimeNumber = strPrimeNumber + a + " ";
}
}
System.out.println("Prime numbers from 1 to " + n + " are : ");
System.out.println(strPrimeNumber);
sc.close();
}
}

Output:

Please enter the value of n : 200
Prime numbers from 1 to 200 are :
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199

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