Write a Java program to find the sum of the first n prime numbers

Write a Java program to find the sum of the first n prime numbers

In this article, we will discuss the concept of Write a Java program to find the sum of the first n prime numbers

In this code, we are going to learn how to write to calculate sum of the first n prime numbers  using different methods in Java program.

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

Code to calculate first n prime numbers

Code to calculate first n prime numbers using for loop

In this program, we will calculate sum of the  first n  prime numbers using for loop in Java language

Program 1

import java.util.*;
public class PrimeSum_firstN{
public static void main(String args[]){
  Scanner sc=new Scanner(System.in);
  //scanner class for input
int i=1,sum=0;
System.out.println("Please Enter value for n: ");
int n=sc.nextInt();
int temp=n;
while(n!=0)
{
  int count=0;
  for(int j=1; j<=i; j++){
    if(i%j==0)
    {
      count++;
    }
  }
  if(count==2){
    sum=sum+i;
    n--;
  }
  i++;
}
  System.out.println("Sum of first "+temp+" Prime numbers are : "+sum);
}

}

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

Please Enter value for n:
25
Sum of first 25 Prime numbers are :1060

 

Code to calculate first n prime numbers using while loop

In this program, we will calculate sum of the  first n  prime numbers using while loop in Java language

Program 2

import java.util.*;
public class PrimeSum_firstNWhile{
public static void main(String args[]){
  Scanner sc=new Scanner(System.in);
  //scanner class for input
int i=1,sum=0;
System.out.println("Please Enter value for n: ");
int n=sc.nextInt();
int temp=n;
while(n!=0)
{
  int count=0;
  int j=1;
  while(j<=i){
    if(i%j==0)
    {
      count++;
    }
     j++;
  }
  if(count==2){
    sum=sum+i;
    n--;
  }
  i++;
}
  System.out.println("Sum of first "+temp+" Prime numbers are : "+sum);
}

}

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

Please Enter value for n:
10
Sum of first 10 Prime numbers are :129

 

Code to calculate first n prime numbers using do-while loop

In this program, we will calculate sum of the  first n  prime numbers using do-while loop in Java language

Program 3

import java.util.*;
public class PrimeSum_firstNDoWhile{
public static void main(String args[]){
  Scanner sc=new Scanner(System.in);
  //scanner class for input
int i=1,sum=0;
System.out.println("Please Enter value for n: ");
int n=sc.nextInt();
int temp=n;
while(n!=0)
{
  int count=0;
  int j=1;
  do{
    if(i%j==0)
    {
      count++;
    }
     j++;
  }while(j<=i);
  if(count==2){
    sum=sum+i;
    n--;
  }
  i++;
}
  System.out.println("Sum of first "+temp+" Prime numbers are : "+sum);
}

}

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

Please Enter value for n:
50
Sum of first 10 Prime numbers are :5117

Code to calculate first n prime numbers using method

In this program, we will calculate sum of the  first n  prime numbers using method in Java language

Program 4

//find sum of prime numbers from 1 to n using method
import java.util.*;
public class PrimeSum_Method{
public static void main(String args[]){
  Scanner sc=new Scanner(System.in);
  //scanner class for input
int num=2,count=0, sum=0;
System.out.println("Please Enter maximum value: ");
int maxValue=sc.nextInt();

System.out.println("Sum of Prime numbers between 1 to "+maxValue+" are : ");
while(count<maxValue){
  if(isprimeNumber(num)){
    sum+=num;
    count++;
  }
  num++;
  }
  System.out.println(sum);
}
private static boolean isprimeNumber(int num){
  for(int i=2; i<=num/2; i++){
    if(num%i==0){
      return false;
  }
}
return true;
}
}

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

Please Enter maximum value:
100
Sum of Prime numbers between 1 to 100 are :
24133

 

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