Question

Write a java code to find the following. For numbers 501 to 999, how many numbers will have the sum of the digits equal to 10.

501, sum of digits=6
502, sum of digits=7
503, sum of digits=8
504, sum of digits=9
505, sum of digits=10
506, sum of digits=11

Answer 1

Here i am writing the code in the java. after this // i will explain about that line

First what is the logic for this program;

logic will be we will make a function or method in java which gives us sum of digit then after getting sum of digit we will compare and if match then we will count it.

code : ( Note: make sure your java program file name and in the code name should be same )

public class Main

{

    public static void main(String[] args) {     //program starts now

       int count=0;               // declaring the variable count which will count the sum of digit is equal to 10

       int temp=0;           // temp variable which will store sum of digit

       for(int i=501;i<=999;i++)      // for loop declaration 501 to 999

       {

           temp = sumFunction(i);   // calling sum function which is created in the below and store the sumfunction value in temp variable

           if(temp==10)             //now checking for equal to 10 if match then it will increment the value of count by 1

           {

               count++;

           }

       }

       System.out.print(count);      // after all done print the value of count then we get how many number are there in the range which sum of digit is equal to 10

    }

public static int sumFunction(int x)      // creating function and taking x variable

{

    int sum=0;           // declaring sum variable where sum will store

    while(x!=0)         // till x not equal to 0 the loop will run

    {

        sum=sum+x%10; // sum of digit algorithm,   

        x=x/10;     

    }

    return sum;         // when loop complete the function will return sum.

}

}

Output is 20