Question

write a java code, please do not use method and demo

Consider a four digit number such as 6587. Split it at two digits, as 65 and 87. Sum of 65 and 87 is 152. Sum of the digits of 152 is 8. Given the starting and ending four digit numbers and a given target number such as 10, write a program to compute and print the number of instances where the sum of digits equals the target.

Answer 1

Java code:

import java.util.Scanner;
public class Main
{
   public static void main(String[] args){
       Scanner input=new Scanner(System.in);
       //initializing starting value,ending value,target,first and second half values,sum of them and the total of digits of sum
       int start,end,target,count=0,h1,h2,sum,total;
       //asking for starting and ending value
       System.out.print("Enter starting and ending value: ");
       //accepting starting value
       start=input.nextInt();
       //accepting ending value
       end=input.nextInt();
       //asking for target
       System.out.print("Enter target: ");
       //accepting target
       target=input.nextInt();
       //looping from start to end
       for(int i=start;i<=end;i++){
            //finding first half value
            h1=i/100;
            //finding second half value
            h2=i%100;
            //finding their sum
            sum=h1+h2;
            //initializing it's digits total as 0
            total=0;
            //looping till sum is 0
            while(sum!=0){
                //adding last digit of sum to total
                total+=sum%10;
                //removing last digit of sum
                sum/=10;
            }
            //checking if total equals to target
            if(total==target)
            //incrementing count
                count++;
       }
       //printing count
       System.out.println("Number of instances="+count);
   }
}

Screenshot:

Input and Output: