fscanf return value

Question

What does fscanf return when it reads data in the file. For example,

int number1, number2, number3, number4, c;

c = fscanf (spFile, \"%d\", &number1);
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Answer 1

I quote from cplusplus.com .

On success, the function returns the number of items of the argument list successfully filled. This count can match the expected number of items or be less (even zero) due to a matching failure, a reading error, or the reach of the end-of-file.

If a reading error happens or the end-of-file is reached while reading, the proper indicator is set (feof or ferror). And, if either happens before any data could be successfully read, EOF is returned.

--EDIT--

If you are intention is to determine the number of bytes read to a string.

int bytes;
char str[80];
fscanf (stdin, "%s%n",str,&bytes);
printf("Number of bytes read = %d",bytes);