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The programmer may then use the names TRUE and FALSE in his/her source file, confident that these will be replaced with the constants 1 and 0 upon compilation:

    done = FALSE;
    while (!done)
    {
        if ((c = getchar()) == 'x')
            done = TRUE;
        else
                   .
                   .
    }

It is good programming practice to use this technique whenever a numerical constant is used, to help identify the purpose of this constant and to simplify future changes:





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