a simple "printf" function

Question

Hi all,

Why all of my "printf" lines have these kind of errors:

stray "\302" in program

stray "\250" in program

stray "\" in program

I deleted the lines and typed again but still the same. I do not think there are some typo error as all the lines with the "printf" have errors.

Thanks,

Clem

bprewit · Accepted Answer

Hi, Clem: On line 58 of your program the "quote" marks are encoded as 0xC2 0xA8 (Octal 302 and 250) rather than as 0x22 (the normal ascii quotation mark) .. actually, all of the quotation marks within the printf statements are that way, but as all of the other printf statements are commented out they're ignored by the compiler Interestingly enough the other quote marks were as expected. HTH, Bruce

iagorubio · Answer

Most likely, you've got a non-printable character in your code.

You can see it opening the file in an hex editor.

Long time ago when I wrote a developer text editor, I had a lot of troubles with weird text people copied from the web, and then reported problems in how my program managed those chars.

Also many people using shift+space and shift+ ... combinations inadvertently, ended up with weird non printable characters in their documents.

To help me debug those I did a tiny executable to dump the offending parts. I'm posting it here but for a whole document the hex editor is much better.

#include <stdio.h>

#include <string.h>

#include <errno.h>

int main (int argc, char **argv)

{

FILE *f;

int c, i=1;

if( argc != 2 ){

printf("Ussage: %s file\n", argv[0]);

return 0;

}

f = fopen(argv[1],"r");

if( f == NULL ){

printf("%s\n", strerror(errno));

return -1;

}

printf("%d: ",i);

while((c = fgetc(f))!= EOF){

if( c == '\n') printf("\n%d:", ++i);

else printf( "'%c'=>'%d' ", c, c);

}

printf("\n");

return 0;

}

It just dumps the decimal value of the character and the printable representation of that character.

As example the output for a file containing the word "test", it would be:

1: 't'=>'116' 'e'=>'101' 's'=>'115' 't'=>'116'

It may help or not, and will for sure fail with UTF-8 or any multi byte encoding, but most source code is ascii.

It helped me when trying to deal with those pesky non printable characters.

Use it at your convenience.

iagorubio · Answer

Clem, you can cross compile in your desktop and then load the code on the pi. As you are using Eclipse, you just need the C plugin. C plugin (CDT) - Eclipse CDT The cross compiler - https://github.com/raspberrypi/tools/archive/master.zip .If you have git or load git on the Eclipse - EGit - you can clone the cross compiler from here https://github.com/raspberrypi/tools And then setup it to use the pi cross compiler on Eclipse - GuruCoding.com - Raspberry Pi Eclipse Tutorial - Setting Up Cross-Compilation In Eclipse After that you can compile your code for arm in the workstation, and load it on the Pi.