Program to display prime numbers from 1 to 100 or 1 to n in Java

Program to display prime numbers from 1 to 100 or 1 to n in Java

In this article, we will discuss the concept of Program to display prime numbers from 1 to 100 or 1 to n in Java

In this program, we are going to learn how to write the code to display prime numbers 1 to n using several ways in Java language.

This is done using for loop , while loop , do-while loop and method in Java language

Print prime numbers from 1 to 100 or 1 to n in Java

Print prime numbers from 1 to 100 or 1 to n using for loop

In this program, we will print prime numbers from 1 to 100 or 1 to n  using a for loop in Java language

Program 1

import java.util.Scanner;
public class DisplayPrime{
public static void main(String args[]){
  int i,count;
  Scanner sc=new Scanner(System.in);
  
  System.out.println("Please Enter value for n: ");
int n=sc.nextInt();

System.out.println("Prime numbers between 1 to "+n+" are : ");

for(int j=2; j<=n; j++){
  count=0;
  for(i=1; i<=j; i++){
    if(j%i==0){
      count++;
    }
}
if(count==2)
  System.out.print(j+" ");
}
}
}

When the above code is executed, it produces the following result

Case 1

Please Enter value for n:
100
Prime numbers between 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

Case 2

Please Enter value for n:
25
Prime numbers between 1 to 25 are :
2 3 5 7 11 13 17 19

 

Print prime numbers from 1 to 100 or 1 to n using while loop

In this program, we will print prime numbers from 1 to 100 or 1 to n  using a while loop in Java language

Program 2

import java.util.Scanner;
public class DisplayPrimeWhile{
public static void main(String args[]){
  int i,count;
  Scanner sc=new Scanner(System.in);
  
  System.out.println("Please Enter value for n: ");
int n=sc.nextInt();

System.out.println("Prime numbers between 1 to "+n+" are : ");

int j=2;
while(j<=n){
  count=0;
  i=1; 
  while(i<=j){
    if(j%i==0){
      count++;
    }
     i++;
}
if(count==2)
  System.out.print(j+" ");
 j++;
}
}
}

When the above code is executed, it produces the following result

Case 1

Please Enter value for n:
100
Prime numbers between 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

Case 2

Please Enter value for n:
50
Prime numbers between 1 to 50 are :
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47

 

Print prime numbers from 1 to 100 or 1 to n using do-while loop

In this program, we will print prime numbers from 1 to 100 or 1 to n  using a do-while loop in Java language

Program 3

import java.util.Scanner;
public class DisplayPrimeDoWhile{
public static void main(String args[]){
  int i,count;
  Scanner sc=new Scanner(System.in);
  
  System.out.println("Please Enter value for n: ");
int n=sc.nextInt();

System.out.println("Prime numbers between 1 to "+n+" are : ");

int j=2;
do{
  count=0;
  i=1;
  do{
    if(j%i==0){
      count++;
    }
     i++;
}while(i<=j);
if(count==2)
  System.out.print(j+" ");
 j++;
}while(j<=n);
}
}

When the above code is executed, it produces the following result

Case 1

Please Enter value for n:
100
Prime numbers between 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

Case 2

Please Enter value for n:
70
Prime numbers between 1 to 70 are :
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67

 

Print prime numbers from 1 to 100 or 1 to n using method

In this program, we will print prime numbers from 1 to 100 or 1 to n  using a method in Java language

Program 4

import java.util.Scanner;
public class DisplayPrimemethod{
public static void main(String args[]){
  int i,count;
  Scanner sc=new Scanner(System.in);
  
  System.out.println("Please Enter value for n: ");
int n=sc.nextInt();

System.out.println("Prime numbers between 1 to "+n+" are : ");

for(i=2; i<=n; i++){
  if(printPrime(i)){
  System.out.print(i+" ");
}

}
}

public static boolean printPrime(int n)
{
  boolean flag =true;
  if(n<=1)
    flag =false;
  for(int i=2; i<=n/2; i++){
    if(n%i==0){
      flag =false;
      break;
    }
  
}
return flag;
}
}

When the above code is executed, it produces the following result

Case 1

Please Enter value for n:
100
Prime numbers between 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

Case 2

Please Enter value for n:
60
Prime numbers between 1 to 60 are :
2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59

 

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