revised edition of textcount.c

textcount_revised.c

#include <stdio.h>

int main()
{
        // Initialize to some arbitrary value so we avoid memory and comparison problems right off the bat
        char currentChar = '\t';
        int symbolCount = 0;
        int numberCount = 0;
        int firstTime = 1;

        while (currentChar != EOF)
        {
                // Get the first character, or if it looped back around, the next character because we ran into a whitespace or something.
                currentChar = fgetc(stdin);

                // If two consecutive characters are "0x", consume characters until we hit a non-hexadecimal character (G-Z)
                if (currentChar == '0')
                {
                        // We know the currentChar is a number, so it's safe to increment numberCount here.
                        numberCount++;

                        // Grab the next character and see if it's an 'x'
                        currentChar = fgetc(stdin);
                        if (currentChar == 'x')
                        {
                                // Aha! It's an 'x', meaning that the next sequence of alphanumeric characters indicate a hexadecimal number
                                // Keep consuming characters until we find one that isn't one.
                                currentChar = fgetc(stdin);

                                while ( ((currentChar >= 'A') && (currentChar <= 'F')) ||
                                                ((currentChar >= 'a') && (currentChar <= 'f')) ||
                                                ((currentChar >= '0') && (currentChar <= '9')) )
                                        currentChar = fgetc(stdin);
                        }
                        else
                        {
                                // Not an 'x', so check to see if it's a number and consume digits until we're done if it is
                                while ( (currentChar >= '0' && currentChar <= '9'))
                                        currentChar = fgetc(stdin);
                        }

                }

                firstTime = 1;

                // Note that, even if we entered the last if statement, that we did not check the currentChar.
                // Check to see if it's a symbol at this point
                while ( ((currentChar >= 'A') && (currentChar <= 'Z')) ||
                        ((currentChar >= 'a') && (currentChar <= 'z')) )
                {
                        if (firstTime == 1)
                                symbolCount++;
                        firstTime = 0;
                        currentChar = fgetc(stdin);
                }

                firstTime = 1;

                // Still need to check for the normal number case. The one inside the special case only handle cases where a zero appears first.
                while ((currentChar >= '0' && currentChar <= '9'))
                {
                        if (firstTime == 1)
                                numberCount++;
                        firstTime = 0;
                        currentChar = fgetc(stdin);
                }
        }
        printf("\nThe symbol count is %d and the number count is %d\n", symbolCount, numberCount);
        return 0;
}