C prog, null strings question

hk20 · 08-30-2008, 03:07 PM

Hello, I am having a problem determining when a string is empty:

ex: input file

"Test1"
"Test2"
""
"Test4"
"Test5"
""
"Test7"

How can I detect those 2 empty strings?

Note: The input has quotes around the letters.

#define QUOTES ""
int i;

while(fscanf(testStream, "%s", &testnum[i]) == 1)
i++;

for(i=0; i<20; i++)
{
result = strcmp(QUOTES, testnum[i]);
if(result == 0)
printf("found string\n"); //print i number of times quotes found.
}

the above only detects 5 strings, not the other 2.

Any ideas? Thank You.

ErV · 08-30-2008, 03:50 PM

about this:

Code:

#define QUOTES ""

This is empty string (length is zero), not string containing two quotes.
If you want two quotes, then you declare string like this:

Code:

const char* str = "\"\"";

or

Code:

#define QUOTES "\"\""

You can also try loading strings line-by-line using fgets.

hk20 · 08-30-2008, 03:57 PM

Thanks for the help! That fixed it