Thread: Allowed number bases for uint8_t variables

  1. #1
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    Question Allowed number bases for uint8_t variables

    I know this is a simple question, but I'm having trouble finding the answer. Example function:
    I2C_Mode I2C_Master_ReadReg(uint8_t dev_addr, uint8_t reg_addr, uint8_t count)
    Because the parameters are mainly register addresses, is it possible to give the parameters as hexidecimal or binary? Or does uint8_t only accept decimal values? Will putting 0x68 or 1101000 instead of 104 cause an error during execution or be syntactically incorrect?

    I can give more details if needed.

    Thanks

  2. #2
    and the hat of int overfl Salem's Avatar
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    Variables don't care about bases. It's all binary to the machine.

    It makes no difference if you say
    var = 104;
    var = 0x68;

    But your average desktop oriented compiler doesn't understand binary constants, but they are common for compilers targeting embedded / small devices.
    So you might also be able to say
    var = 0b1101000;
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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