How do you sum up numbers from 1 to n?

Answer 1

1. import java.util.Scanner;
2. public class average {
3. static int i=0;
4. static double sum = 0;
5. static double average = 0;
6. public static double calcSum(double sum){
7. double count;
8. Scanner input = new Scanner(System.in);
9. while(i < 5){
10. count = input.nextDouble();
11. sum = sum + count;
12. i++;
13. }
14. return sum;
15. }
16. public static double calcAverage(double average){
17. double sum = calcSum(sum);
18. average = calcSum(sum) / 5;
19. return average;
20. }
21. public static void main(String[] args) {
22. System.out.println("Please enter 5 numbers.");
23. System.out.println("Sum is: "+calcSum(sum));
24. System.out.println("Average is: "+calcAverage(average));
25. }
26. }

Answer 2

sumOfOneToN(int n)
{
if(n <= 1)
return n;
else
return( n + sumOfOneToN( n - 1 ) );

}

Answer 3

Numbers from 1 to n can be summed up in Perl using the code below: BEGIN { $/ = "n"; $ = "n"; } LINE: while (defined($_ = )) { chomp $_; $sum += $_; } sub END { print $sum; } -e syntax OK