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Thread: adding numbers
 03092011, 03:57 AM #1Senior Member
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adding numbers
i am trying to add every number (i had 141062). i broke them apart, and convert them to ints. then i can add them. am i going about this the right way? here is what i have so far:
Java Code:for (count = 0; i<doubledDigits.length(); i++) { numbersToAdd2 = doubledDigits.charAt(i); // gets 2610 as a string numbers4 = Integer.parseInt(numbersToAdd2); //string==>int numbers3 = numbers3 + numbers4; }
 03092011, 04:05 AM #2
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Are you trying to calculate digit sum of a number?
Looks like it's correct though, does it compile and run?
 03092011, 04:13 AM #3Senior Member
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yes, i am.
sorry, maybe this is better?...
Java Code:for (count = 0; i<doubledDigits.length(); i++) { numbers2 = doubledDigits.charAt(i); numbers3 = numbers2 + numbers3; }
 03092011, 04:17 AM #4
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It should work if you loop through, parse each and add it to the sum.
You can also do it with a number directly using / and %.
 03092011, 04:21 AM #5Senior Member
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here is what i have:
Java Code:for (i = 0; i < lengthCC ; i += 2) // get every other number (start 1 from the right) { nextDigit = (Character.getNumericValue(creditCardNumber.charAt(i))); doubledNextDigit = (nextDigit*2); // multiply that number at i by 2 numbers = Integer.toString (doubledNextDigit); doubledDigits = doubledDigits + numbers; // doubledDigits is in string form... } System.out.println("Your double digits are: " + doubledDigits); //WORKS!!! (261014) String string = ""; for (count = 0; i<doubledDigits.length(); i++) { numbersToAdd2 = doubledDigits.charAt(i); // gets 2610 as a string numbers4 = Integer.parseInt(numbersToAdd2); //string==>int numbers3 = numbers3 + numbers4; }
numbersToAdd2 was initialized as a int... doubledDigits is a string... so numbersToAdd2 should be an int, right?Last edited by droidus; 03092011 at 04:25 AM.
 03092011, 04:24 AM #6
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In the original part try using the strong substring method instead. Then parse to integer and add it to the sum. What is the goal of the first loop?
 03092011, 04:26 AM #7Senior Member
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to double each of the digits. i then set it to a string
i did this:
Java Code:String string = ""; String doubledDigits = ""; int numbers5 = 0; int numbers3 = 0; for (count = 0; i<doubledDigits.length(); i++) { string = doubledDigits.substring(i); // gets 2610 as a string numbers5 = Integer.parseInt(string); //string==>int numbers3 = numbers3 + numbers5; }
Last edited by droidus; 03092011 at 04:33 AM.
 03092011, 05:26 AM #8
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