bitmask

This is a discussion on bitmask within the C Programming forums, part of the General Programming Boards category; Can anyone tell me how to use a bitmask to convert uppercase letters to lowercase thank you...

  1. #1
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    bitmask

    Can anyone tell me how to use a bitmask to convert uppercase letters to lowercase thank you

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    Try one of these:
    tolower(int); I believe it is defined in types.h
    or
    char tolower(char in) {
    if(in >= 'A' && in <= 'Z')
    return in + 'a' - 'A';
    else return in;
    }

    In the ASCII character set, upper case is before lower case, so the difference between the an upper case and its lower case counter part is 'a' - 'A'.

    You can use a bit mask if necessary, but it will be a little more complicated. Think of how you would add and subtract two bits together using only boolean operators. I have done it in the past a bit at a time.

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    Do an OR operation on the uppercase letter with a bitmask of hex 20.

    char bitmask = 0x20;

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    Thank you. I'll try that.

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