# Java program to display prime numbers from 1 to 100 and 1 to n

The number which is only divisible by itself and 1 is known as prime number. For example 2, 3, 5, 7…are prime numbers. Here we will see two programs: 1) First program will print the prime numbers between 1 and 100 2) Second program takes the value of n (entered by user) and prints the prime numbers between 1 and n. If you are looking for a program that checks whether the entered number is prime or not then see: Java Program to check prime number.

## Program to display the prime numbers from 1 to 100

It will display the prime numbers between 1 and 100.

```class PrimeNumbers
{
public static void main (String[] args)
{
int i =0;
int num =0;
//Empty String

for (i = 1; i <= 100; i++)
{
int counter=0;
for(num =i; num>=1; num--)
{
if(i%num==0)
{
counter = counter + 1;
}
}
if (counter ==2)
{
//Appended the Prime number to the String
}
}
System.out.println("Prime numbers from 1 to 100 are :");
}
}```

Output:

```Prime numbers from 1 to 100 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```

## Program to display prime numbers from 1 to n

It will display all the prime numbers between 1 and n (n is the number, entered by user).

```import java.util.Scanner;
{
public static void main (String[] args)
{
Scanner scanner = new Scanner(System.in);
int i =0;
int num =0;
//Empty String
System.out.println("Enter the value of n:");
int n = scanner.nextInt();
scanner.close();
for (i = 1; i <= n; i++)
{
int counter=0;
for(num =i; num>=1; num--)
{
if(i%num==0)
{
counter = counter + 1;
}
}
if (counter ==2)
{
//Appended the Prime number to the String
}
}
System.out.println("Prime numbers from 1 to n are :");
```Enter the value of n: