Programming Examples

Java program to input a positive integer number and prints the possible consecutive number combinations


A positive natural number , (for example 27) can be represented as follows:

2+3+4+5+6+7

8+9+10

13+14

where every row represents a combination of consecutive natural numbers, which add up to 27.

Write a program which inputs a positive natural number N and prints the posibale consecutive  number combinations, which when added given N.

Test your program for the following data and some random data.

Solutions 1:

import java.util.*;
public class Consecutive
{
    public static void main(String arr[])
    {
        Scanner sc=new Scanner(System.in);
        int i,j,k,n,sum;
        System.out.println("Enter a number");
        n=sc.nextInt();
        for(i=1;i<=n/2+1;i++)
        {
            sum=0;
            for(j=i;j<=n/2+1;j++)
            {
                sum=sum+j;
                if(sum==n)
                break;
            }
            if(j<=n/2+1)
            {
                for(k=i;k<=j;k++)
                System.out.print(k+" ");
                System.out.println();
            }
        }
    }
}
Solution 2: (Using Function)
import java.util.*;
class number
{
   
    int sum(int i,int num)
    {
        int s1=0;
        for(int x=i;s1<num;x++)
        {
           
                s1=s1+x;
            
        }
        return (s1);
    }
    public static void main(String args[])
    {
        Scanner sc=new Scanner (System.in);
        System.out.println("Enter a number");
        int n=sc.nextInt();
        int s;
        number obj=new number();
        for(int j=1;j<=n;j++)
        {    
        int ans=obj.sum(j,n);
        s=0;
        if(ans==n)
        {
            for(int y=j;s<n;y++)
            {
                s=s+y;
                System.out.print(y+"  ");
            }
            System.out.println();
        }
        
    }
}
}
Output

Enter a number

21

1  2  3  4  5  6  

6  7  8  

10  11  

21  


Test 2:

Enter a number
15
1 2 3 4 5 
4 5 6 
7 8 
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