write a java program to find sum of even numbers in first 20 natural numbers. anyone answer !!! I will mark brainliest!! friends answer.. ?????
Answers
The positive integers 1, 2, 3, 4 etc. are known as natural numbers. Here we will see three programs to calculate and display the sum of natural numbers.
First Program calculates the sum using while loop
Second Program calculates the sum using for loop
Third Program takes the value of n(entered by user) and calculates the sum of n natural numbers
To understand these programs you should be familiar with the following concepts of Core Java Tutorial:
Java For loop
Java While loop
Example 1: Program to find the sum of natural numbers using while loop
public class Demo {
public static void main(String[] args) {
int num = 10, count = 1, total = 0;
while(count <= num)
{
total = total + count;
count++;
}
System.out.println("Sum of first 10 natural numbers is: "+total);
}
}
Output:
Sum of first 10 natural numbers is: 55
Example 2: Program to calculate the sum of natural numbers using for loop
public class Demo {
public static void main(String[] args) {
int num = 10, count, total = 0;
for(count = 1; count <= num; count++){
total = total + count;
}
System.out.println("Sum of first 10 natural numbers is: "+total);
}
}
Output:
Sum of first 10 natural numbers is: 55
Example 3: Program to find sum of first n (entered by user) natural numbers
import java.util.Scanner;
public class Demo {
public static void main(String[] args) {
int num, count, total = 0;
System.out.println("Enter the value of n:");
//Scanner is used for reading user input
Scanner scan = new Scanner(System.in);
//nextInt() method reads integer entered by user
num = scan.nextInt();
//closing scanner after use
scan.close();
for(count = 1; count <= num; count++){
total = total + count;
}
System.out.println("Sum of first "+num+" natural numbers is: "+total);
}
}
Output:
Enter the value of n:
20
Sum of first 20 natural numbers is: 210
Answer:
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