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Thread: Im beginner need a solution for one logic

  1. #1
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    Default Im beginner need a solution for one logic

    Find the largest sum of an individual digit of an element in array
    Ex a=[23,34,56,47,88,12,]
    2+3=5
    3+4=7
    Same way largest sum is 16
    The output should be 88

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Im beginner need a solution for one logic

    http://mattgemmell.com/2008/12/08/what-have-you-tried/

    Be sure to wrap all posted code in code tags.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Im beginner need a solution for one logic

    I would suggest creating 2 arrays, one to store those integers you've listed and one to store the combined values of the digits. To get the values of the combined digits you can use a while loop.

     
     
    while(i<5) {
     
        combined[i]= (digit[i] % 10 ) + (digit[i]/10);
    	i++;
        }


    --- Update ---

    Hey, norm I'm a little new to java as well what do you think of the solution and how would you approach this problem.

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    Super Moderator Norm's Avatar
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    Default Re: Im beginner need a solution for one logic

    @Rango - You need to describe how the code extracts the values of the digits in a base-10 number. Just giving an OP code doesn't always help them learn and/or understand how to solve problems.
    If you don't understand my answer, don't ignore it, ask a question.

  5. The Following User Says Thank You to Norm For This Useful Post:

    Rango (April 24th, 2021)

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    Default Re: Im beginner need a solution for one logic

    The values you've given are/can be stored in an array. The code for the loop I provided above does as such: the loop will run as long as
     i < 5
    the line
     combined[i]= (digit[i] % 10 ) + (digit[i]/10);
    is what adds the digits of the numbers you originally stored in your first array. For this problem you are working with two arrays, "combined" and "digit". "Digit" holds the integers you've listed while "combined" hold the addition of the digits of the numbers. A trick to isolate the digits of a base-10 number is to use "%" and "/". Both operands are divisor, but the "/" gives the whole value of the division ex. 25 / 10 = 2.5, but java will out put only "2", whereas if you do 25%10 it will out put the remainder ie. "5". This line uses that logic to to isolate the digits. Once isolated they are combined and stored in a second array the
     [i]
    is a place holder in the array and is incremented by one each time the loop is excecuted.

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    Default Re: Im beginner need a solution for one logic

    Using a hardcoded 5 in the logic makes the code inflexible. What if the array is changed to have 7 members?
    It is better when working with arrays to use the array's length field: theArray.length to get the length of the array.

    Another inflexible bit: What if the numbers in the array have more than 2 digits? How would you handle that?
    If you don't understand my answer, don't ignore it, ask a question.

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