Why i cant run it?

Question about the task

Utility class: part 2

Java Syntax, Level 8, Lesson 0

Under discussion

Just paid for subscription and the first thing i see " Unable to run"

Use methods of the Math class to correct the methods of the Solution class:

sqrt(double) should return the square root of the input parameter.
cbrt(double) should return the cube root of the input parameter.
pow(int, int) should return the value of the first parameter raised to the power of the second parameter.

Requirements:

Implement the sqrt(double) method in accordance with the task conditions.
Implement the cbrt(double) method in accordance with the task conditions.
Implement the pow(int, int) method in accordance with the task conditions.

package en.codegym.task.pro.task08.task0802; /* Utility class: part 2 */ public class Solution { public static double sqrt(double a) { return Math.sqrt(a); } public static double cbrt(double a) { return a * a * a; } public static double pow(int number, int power) { if (power == 0) { return 1; } int modulus = power < 0 ? power * -1 : power; int result = number; for (int i = 1; i < modulus; i++) { result *= number; } return power < 0 ? 1.0 / result : result; } }

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Danila Hnidko

Level 8 , Philadelphia, United States

1 April, 22:02

Still doesnt work, meanwhile i can run solution without main method and its going go pass the test.whats going on?

Guadalupe Gagnon

Level 37 , Tampa, United States

2 April, 13:23

The validation system does not need a main method in your code as it runs on its own and calls your code from its code. I tested this code on a random other codegym task I have available, with and without the main() method, and it runs without any errors in both cases. My theory is that this specific task has a restriction on it that disallows the 'run' button.

Guadalupe Gagnon

Level 37 , Tampa, United States

1 April, 20:31

Probably because there is a lack of a main() method in this code, which is an entry point for code to run. Java needs a main() method somewhere in a full program (not in every single class that makes up a program) or it won't be able to start.