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User is offline Mar 07 2013 02:38 PM
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  1. In Topic: filter program to remove comments

    Posted 7 Mar 2013

    View PostJackOfAllTrades, on 07 March 2013 - 02:27 PM, said:

    I would suspect that if the assignment was to "create a filter", SOMETHING about creating a filter would have been covered in the class or the textbook.

    EDIT: Like snoopy11 intimates, could it be something like this?

    % a.out < inputfile > outputfile
    ?


    Yea, I guess you are right. The professor wants me to do something line a < a.txt and then prints to stdout.

    
#include <stdio.h>
#include <stdlib.h>

int main(int argc, char * argv[])
{
    char c;
    while ((c=getchar() != EOF))
    {
      	if (c == '/')
	{
	    c = getchar();
	    if (c == '/')
	    {
		while (1)
		{
		    c = getchar();
		    if (c == '\n')
			goto label;
		}		
	    }
	    
	    if (c == '*')
	    {
		while (1)
		{
		    c = getchar();
		    if (c == '*')
		    {
			c = getchar();
			if (c == '/')
			{
			    while (1)
			    {
				c = getchar();
				goto label;
			    }
			}
		    }
		}
	    }
	}
      label: putchar(c);
    }
    return EXIT_SUCCESS;
}

    Here is my code. I changed it from opening file from fopen. But now the output is just a mass, seems something wrong with memory.

  2. In Topic: gcc warn uninitialized string

    Posted 4 Mar 2013

    View Postsepp2k, on 04 March 2013 - 10:03 PM, said:

    View Postungeilimage, on 05 March 2013 - 05:56 AM, said:

    OK, I added a malloc to the pointer and it worked.


    Since MAX_INPUT looks to be a #defined constant, you can just use a static array rather than malloc: char input[MAX_INPUT];. If you do use malloc, make sure to call free on it afterwards.

    Quote

    However, strcmp does not work now, whatever I enter, it always returns a non-zero number.


    From man fgets:

    Quote

    If a newline is read, it is stored into the buffer.


    So if the user enters "y", input will contain the string "y\n", not just "y".


    YES!! Added y\n and it worked!! Thanks a lot!

  3. In Topic: gcc warn uninitialized string

    Posted 4 Mar 2013

    OK, I added a malloc to the pointer and it worked. However, strcmp does not work now, whatever I enter, it always returns a non-zero number.

  4. In Topic: gcc warn uninitialized string

    Posted 4 Mar 2013

    The last line is meaningless, can ignore it. (printf("%s", input))

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