How to clear multiple bits at once in C?

Question

How would I simplify all of this into one line?

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    REG &= ~BITA;
    REG &= ~BITB;
    REG &= ~BITC;
    REG &= ~BITD;
    REG &= ~BITE;

Answer 1

You can use | (bitwise or) operator.

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REG &= ~(BITA | BITB | BITC | BITD | BITE);