Need Help!!!!!!!!!

**robwhit** · 01-31-2008

%d is for ints. %c is for chars. If you output a char with a %d, you will get a number. If you read in a %d into an int and output it with a %d, you will get a number. If you input a %c and output a %c, you will get a character. If you read in with fgetc and output with %c, you will get a character. If you read in with getc and output with %c, you will get a character.

**Aia** · 01-31-2008

Originally Posted by leiming

Maybe it's better to use fscanf than getc here.

Code:

	while( !feof(fp) && fscanf(fp, "%d\n", &c) != 0){
		printf( "%d\n", c);
	}

Why do I always get put off when I see the use of the function feof() as a condition to stop a loop?

**leiming** · 01-31-2008

Originally Posted by Aia

Why do I always get put off when I see the use of the function feof() as a condition to stop a loop?

I think the two conditions work together will not produce an error.

**Elysia** · 02-01-2008

But I believe the example should work if there are only integers on the lines.
Of course, it will also read the newlines and probably choke when reading it, so the code isn't perfect.

**mike_g** · 02-01-2008

but dosent this:

Code:

fscanf(fp, "&#37;d\n", &c)

Specify the input format as an integer followed by a new line?

**Elysia** · 02-01-2008

Dunno. I have no freakin' idea how fscanf works. That's why I hate the thing.
But then there's really nothing to complain about, is there?

**mike_g** · 02-01-2008

Well the scanf part of it reminds me of that horrible method of getting user input, but that dosent necessarily mean that fscanf is bad. After all parsing text from a file is generally quite a picky thing anyway.

Still I dont know if it would be as good for error handling as reading in strings, then using srttol to convert them, but that would require a load of extra code.

**tabstop** · 02-01-2008

Originally Posted by mike_g

but dosent this:

Code:

fscanf(fp, "%d\n", &c)

Specify the input format as an integer followed by a new line?

Not quite:

Originally Posted by ISO C, 7.19.6.2

A directive composed of white-space character(s) is executed by reading input up to the first non-white-space character (which remains unread), or until no more characters can be read.

So, an integer, then some kind of white-space.

Thread: Need Help!!!!!!!!!

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