[internationalization] decimal point and comma of application development

Antecedents feed ： Many countries express decimals , It is not a universal decimal point '.', Instead, use a comma ','. This seemingly harmless setting , Sometimes fatal bug.

The story ： A domestic game developer is google play On the shelves of a game app, The main release area is Southeast Asia , Everything was fine for the first few days . Suddenly one day , A player released a game video with a major BUG, The attack of players has doubled several times , The attack speed has also accelerated a lot , The originally difficult level , He walked past , Planners who don't know the truth , Crying in the toilet .. And as a BUG The procedures of manufacturing experts , A steady expression like a dog , In fact, I'm already in a panic , The hand that knocks code is shaking . For several days , No clue ,BOSS After knowing , fly into a rage , Give an ultimatum ,24 The battle must be resolved within hours （ No BUG）, or , All staff dog belt ..

This story is pure fiction , any similarity , It's a coincidence , Of course, some plots still happen .

Intermediate screening （ Have you checked the unknown ..） Things are not on the table , Let's go straight to the conclusion . Cause this BUG The culprit of , It is the comma mentioned in the preceding paragraph that indicates the decimal point . Because some countries （ Like France , Germany , Brazil , Indonesia, etc ） Have this special hobby , Lead to players in this area , By default, the mobile phone environment is set according to this area . so what , Games generally have configuration data , For example, some battle elements are set , Skill Bonus , Kung Fu or something , When the configuration , Decimals are used , Then read it into the program , It is directly converted to decimal in local format , such as 3.1415926 Was turned into 3,1415926 So . In some languages, the comma operator can also perform operations , Some languages , Or interface , When it comes to data like this , The application may collapse directly , This will lead to various unexpected operating results .

terms of settlement ：

Found the reason , It can be traced after processing ：

1. Since it is caused by decimals , Then don't use decimals , This is simple and rough , Actually, game operation , It is better to perform integer operation , Decimal operations , Different programming languages will differ , There may be inconsistencies in accuracy , There is also a performance problem , There are some CPU, Decimal operations are not as fast as integers .

2. In a word, it is caused by the program running in different environments , Some areas can operate normally , Such as China , Japan, etc , Then set the operating environment as an area that can run according to the decimal point , The more common one is to set it as an English speaking country , such as C# You can call the interface CultureInfo.CreateSpecificCulture(string) To set . Although such a setting can solve this problem , But there are also hidden dangers that cannot be localized .

3. Turn it directly in the place of use , This... , laborious .