code works but doesn't verify

Question about the task

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I did everything according to the conditions but it doesn't verify. The code works as it should. Maybe I'm overlooking something but I just can't find it. I would be grateful if you could find the problem!

The public static toOctal(int) method must convert the integer received as an input parameter from the decimal numeral system into octal. And conversely, the public static toDecimal(int) method converts from the octal system into decimal.
The methods only work with positive numbers. If the input parameter is less than or equal to 0, the methods return 0.
Your task is to implement these methods.

One algorithm for converting a decimal number to octal is as follows:


i is equal to 0
while (the decimal number is not 0) {
the octal number = the octal number + (remainder of the division of the decimal number by 8) * 10 to the power of i
the decimal number = the decimal number / 8
increase i by 1
}

One algorithm for converting an octal number to decimal is as follows:


i is equal to 0
while (the octal number is not 0) {
the decimal number = the decimal number + (remainder of the division of the octal number by 10) * 8 to the power of i
the octal number = the octal number / 10
increase i by 1
}

The main() method is not involved in testing.

Hint: You can use the Math.pow(number, degree) method to raise a number to a power.

Requirements:

The toOctal(int) method needs to be implemented as outlined in the task conditions.
The toDecimal(int) method needs to be implemented as outlined in the task conditions.
The Integer.toOctalString(int) and Long.toOctalString(int) methods cannot be used.
The Integer.parseInt(String, int) and Long.parseLong(String, int) methods cannot be used.
The Integer.toString(int, int) and Long.toString(long, int) methods cannot be used.
You cannot use a BigInteger object.
You cannot use a BigDecimal object.

package en.codegym.task.pro.task09.task0905; /* Octal converter */ public class Solution { public static void main(String[] args) { int decimalNumber = 21; System.out.println("Decimal number " + decimalNumber + " is equal to octal number " + toOctal(decimalNumber)); int octalNumber = 25; System.out.println("Octal number " + octalNumber + " is equal to decimal number " + toDecimal(octalNumber)); } static int decimalNumber = 0; static int octalNumber = 0; public static int toOctal(int decimalNumber) { if (decimalNumber <= 0){ return 0; } int i = 0; while (decimalNumber != 0) { octalNumber = (int) (octalNumber + (decimalNumber % 8) * Math.pow(10, i++)); decimalNumber = decimalNumber / 8; } return octalNumber; } public static int toDecimal(int octalNumber) { if (octalNumber <= 0){ return 0; } int i = 0; while (octalNumber != 0) { decimalNumber = (int) (decimalNumber + (octalNumber % 10) * Math.pow(8, i++)); octalNumber = octalNumber / 10; } return decimalNumber; } }

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drAcs

Level 26 , Germany, Germany

7 December 2023, 19:34

Thanks a lot! I found the problem

Thomas

Level 41 , Bayreuth, Germany

7 December 2023, 13:47

Codegym not only verifies if the test cases in the main method give a proper result. Instead they (probably) run a good bunch of tests. And if you run several tests the results get wrong. Try yourself if with eg.

System.out.println(toOctal(10));
System.out.println(toOctal(11));
System.out.println(toOctal(12));

inside the main method. Only the first call returns a correct result. The rest is faulty. The reason for that is the usage of static variables for decimalNumber and octalNumber.