Java Program to print Sum of N Even numbers
Get input n and print n even numbers.
Sample Input 1:
7
Sample Output 1:
The sum of N Even numbers:56
Program or Solution
import java.util.*;
class SumOfNEven
{
public static void main(String args[])
{
int i,j,N,sum=0;
System.out.println("Enter The Value Of N");
Scanner sc=new Scanner(System.in);
N=sc.nextInt();
for(j=1,i=2;j<=N;i=i+2,j++)
{
sum=sum+i;
}
System.out.println("The Sum Of N Even Numbers: "+sum);
}
}
Program Explanation
1. Get input N (How many even numbers to be summed)
2. Instruction(s) inside the for block{} are executed repeatedly till the second expression (j<=N) is true.
for(j=1,i=2;j<=N;i=i+2,j++)
3. Here i is initialized to 2 and j is initialized to 1 and i is incremented by 2 and j is incremented by 1 for each iteration.
instructions inside the for block are executed in every iteration and iteration stops when j becomes greater than N. so value of i (2,4,6... ) will be added to sum.
so even numbers (i) are added to the sum for j --> 1 to N times
sum = sum + j
sum = 0 + 2
sum = 2 + 4
sum = 6 + 6
sum = 12 + 8
..................
..................
after adding all N even numbers to sum, sum will be printed using system.out.println().
Comments
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