if (triple.rgbtRed == 255)
            triple.rgbtRed = 0;
            triple.rgbtBlue = 100;
            triple.rgbtGreen = 60;
        // write RGB triple to outfile
        fwrite(&triple, sizeof(RGBTRIPLE), 1, outptr);

I have this code but the error it shows me is this:

whodunit.c:77:40: error: invalid digit 'f' in octal constant if (triple.rgbtRed == 0000ff) ^

whodunit.c:79:36: error: use of undeclared identifier 'ffff'; did you mean 'feof'? triple.rgbtRed == ffff; ^~~~ feof

/usr/include/stdio.h:828:12: note: 'feof' declared here extern int feof (FILE __stream) __THROW __wur; ^ whodunit.c:79:33: error: comparison between pointer and integer ('int' and 'int ()(FILE )' (aka 'int ()(struct _IO_FILE *)')) [-Werror] triple.rgbtRed == ffff; ~~~~~~~~~~~~~~ ^ ~~~~

whodunit.c:79:33: error: equality comparison result unused [-Werror,-Wunused-comparison] triple.rgbtRed == ffff; ~~~~~~~~~~~~~~~^~~~~~~

whodunit.c:79:33: note: use '=' to turn this equality comparison into an assignment triple.rgbtRed == ffff; ^~ =

  • 1
    Possible duplicate of why cant i use the hexadecimal codes in my program? – Blauelf Jun 15 '18 at 10:06
  • Blau, I thought of that too, but it had an incomplete explanation of hex and octal representation. – Cliff B Jun 15 '18 at 10:08
  • Your error messages don't match the code you've shown us, so either you didn't save your source code before running make or you've compiled a different version than you are showing us. – curiouskiwi Jun 15 '18 at 10:39
  • I did save that code before compiling it. but shows me the same. I even did update50 for that reason but I am getting the same error...The I have changed my code and that's what I have posted above – Asha Thomas Jun 15 '18 at 11:05
  • sry, I got was I went wrong. Actually, I had two files of whodunit and in one of that code used hexa value and so I guess it was the reason of that error. But now it shows me this: clang: error: linker command failed with exit code 1 (use -v to see invocation) help me with this!!! – Asha Thomas Jun 15 '18 at 11:11

Hexadecimal numbers must start with 0x, as in 0x0000ff. Octal numbers start with just a 0, which is NOT part of the number. Octals also only use digits 0 to 7.

Also, if the error says that the line if (triple.rgbtRed == 0000ff) is in the file, I would ask if you saved the updated code, and saved it to the correct file in the correct directory before compiling it.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .