Java Exercises: Compute the sum of first n given prime numbers
Java Basic: Exercise-232 with Solution
Write a Java program to compute the sum of first n given prime numbers.
Input:
n ( n ≤ 10000). Input 0 to exit the program.
Pictorial Presentation:
Sample Solution:
Java Code:
import java.util.*;
public class Main {
public static void main(String[] args) throws java.io.IOException{
Scanner scan = new Scanner(System.in);
int count=0;
int sum=0;
System.out.println("Input a number (n<=10000) to compute the sum:");
int n=scan.nextInt();
for(int i=2;;i++){
if(prime(i)){
count++;
sum+=i;
if(count==n)break;
}
}
System.out.println("Sum of first "+n+" prime numbers:");
System.out.println(sum);
}
public static boolean prime (int n){
if(n==1)return false;
for(int i=2;i<=Math.sqrt(n);i++)
if(n%i==0)return false;
return true;
}
}
Sample Output:
Input a number (n<=10000) to compute the sum: 100 Sum of first 100 prime numbers: 24133
Flowchart:
Java Code Editor:
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Previous: Write a Java program to find the difference between the largest integer and the smallest integer which are created by 8 numbers from 0 to 9. The number that can be rearranged shall start with 0 as in 00135668.
Next: Write a Java program that accept a even number (n should be greater than or equal to 4 and less than or equal to 50,000, Goldbach number) from the user and create a combinations that express the given number as a sum of two prime numbers. Print the number of combinations.
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Java: Tips of the Day
How to sort an ArrayList?
Collections.sort(testList); Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
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