Java:

• Missing fixed tests

• method name should be camelCase, not PascalCase

Refer here on how to enable backward compatability to not invalidate all solutions

Given a number T from interval [1..2147483646], find if it is triangular number or not.

Crystal doesn't have big tests.

Potential floating point errors before rounding in Java.
Unlikely given the limited number of operations but possible.

Fork that fixes it

Description should be changed to either remove "which can be positive or negative," or explicitly state that 0 is an acceptable value. Otherwise, that clause sounds like a constraint on which integers are allowable.

C#: method name should be PascalCase (Please refer to implementation of backward compatibility here )

No random tests in

• C#

• Java

Missing fixed tests in C#

Modifying the input causes actual tests to break.

RISC-V Translation

I dont understand why using floor, round or ceiling does not gives different values
eg.
input 1 km/h => Math.Floor(1 * k) => output 29
input 1 km/h => Math.Round(1 * k) => output 30
input 1 km/h => Math.Ceiling(1 * k) => output 31

D translation