Rounding Issue Causing Incorrect Latitude Value

[حسن حربي‎]

Dear All,

I would like to highlight an issue related to rounding that can lead to incorrect results.

For example, the latitude value is 30.8761. When the system rounds this value to two decimal places, it becomes 30.88. This rounding changes the actual value and can cause logical or validation mistakes in  calculations.

we need a proper way to control digits ,This will help ensure accuracy 

code example :

tolerance = 0.005
lat = 30.8761
see tolerance + nl
see lat + nl

-------------------------------------------------

the rustle :

0.01
30.88

Greetings,

Hassan Harby  

[Bert Mariani]

Hello ...

Unfortunately Floating Point is not precise and has rounding errors.

Back in the days of Main Frame computers .... The Hardware  had BCD Binary Coded Decimal  instructions and data format that was completely accurate.

Ring only supports Long Floating Point.

Regards

Bert Mariani 

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[Mansour Ayouni]

Hello Hassan,

May decimals(4) resolves your issue:

Best,

Mansour

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[Bert Mariani]

Hello Hassan

+6

The Intel x86 architecture supports Binary-Coded Decimal (BCD)

, but this support is considered legacy and is not available in 64-bit mode (x86-64). The instructions were designed to assist in financial and commercial applications requiring precise decimal arithmetic, allowing for packed (two digits per byte) and unpacked (one digit per byte) BCD formats. 

[Ilir Liburn]

Hello Hassan,

number is rounded because decimals is 2. Just us decimals(4) before calling print.

BTW, Ring2C supports long double type, result is still rounded

tolerance = 0.005
lat = 30.8761:long_double
see tolerance + nl
see lat + nl // prints 30.88

Greetings,

Ilir

[حسن حربي‎]

Hello All,

Thanks for your support. after decimals function , i can control in digits.  

Greetings,

Hassan Harby