Question

Sum of Numbers Problem:

Write a method that accepts an integer argument and returns the sum of all the integers from 1 up to the number passed as an argument. For example, if 50 is passed as an argument, the method will return the sum of 1, 2, 3, 4, . . . 50. Use recursion to calculate the sum. Demonstrate the method in a program. The program should be called SumOfNumbers.java.

Answer 1

Program:

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class SumOfNumbers
{
  
public static void main(String[] args)
{
int n,j=0;
Scanner s = new Scanner(System.in);
System.out.print("Enter the no.:");
n = s.nextInt();
SumOfNumbers obj = new SumberOfNumbers();
int x = obj.add(n,j);
System.out.println("Sum:"+x);
}
int add(int n,int j)
{
  
if(j <= n)
{
return j + add(n,j+1);
}
else
{
return 0;
}
}
}

Output:

Enter the no.:8

Sum:36