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Using float variable

king tran

Hello everyone !

I have a problem with the float variables.

For example, i define float a = 123456123456.1234 and char lcd[30];

I used sprintf function to convert a to string and store into lcd (sprintf(lcd,"%0.2f",a);).

Then, i export lcd to LCD 16x2.

Result i see on the LCD is "123456100000.00"

Why this ?

And can everyone show me how to print a on LCD ("123456123456.1234")?

Best regard !

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  • 0 in reply to king tran

    "do you have any solutions ?"

    As I already suggested:
    "If you want to play with lots of value digits, then you need to play with some form of fixed-point arithmetic - and implement or use a big-number library where the value is stored in an array of bytes or integers."

    You did check the manual, to figure out the size for "float" and "double" data types when using the C51 compiler?

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  • 0 in reply to king tran

    "do you have any solutions ?"

    As I already suggested:
    "If you want to play with lots of value digits, then you need to play with some form of fixed-point arithmetic - and implement or use a big-number library where the value is stored in an array of bytes or integers."

    You did check the manual, to figure out the size for "float" and "double" data types when using the C51 compiler?

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