Strange .C file - c

Question

Don't ask where and why I got it, but I have a lot of lines like these in .c file:
0005080: 3465 3434 2035 6635 6620 2064 6c65 2e5f 4e44 5f5f dle._
0005090: 5f44 544f 525f 454e 445f 5f0a 3030 3031 _DTOR_END__.0001
00050a0: 3334 303a 2030 3035 6620 3566 3663 2036 340: 005f 5f6c 6
00050b0: 3936 3220 3633 3566 2036 3337 3320 3735 962 635f 6373 75
00050c0: 3566 2036 3936 6520 3639 3734 2020 2e5f 5f 696e 6974 ._
00050d0: 5f6c 6962 635f 6373 755f 696e 6974 0a30 _libc_csu_init.0
What can I do with it? Is this a program?

Answer 1

That's not a C file. That's not a C file at all!
What appears to have happened here is that someone flipped some parameters trying to compile a file; something like gcc -o my_file.c my_file.c, or something to that effect.
If you're on Linux, you can run the file utility to figure out what it is.
Note:
This might well also be a piece of malware: The enterprising would-be attacker sent you the file, hoping you would double-click it in the file manager, causing it to execute and do something nasty.
Edit:
Also, is that the literal content of the file, or the file as seen through xxd? If it's the former, it's more likely a mistake of some kind; but if it's the latter: Beware.

Answer 2

This looks like the output of the hexdump command.
If you have a file temp.c with the following code:
#include<stdio.h>
int main()
{
printf("Hello World!\n");
return 0;
}
Then, hexdump -C temp.c will produce the output as:
00000000 23 69 6e 63 6c 75 64 65 3c 73 74 64 69 6f 2e 68 |#include<stdio.h|
00000010 3e 0a 69 6e 74 20 6d 61 69 6e 28 29 0a 7b 0a 09 |>.int main().{..|
00000020 70 72 69 6e 74 66 28 22 48 65 6c 6c 6f 20 57 6f |printf("Hello Wo|
00000030 72 6c 64 21 5c 6e 22 29 3b 0a 09 72 65 74 75 72 |rld!\n");..retur|
00000040 6e 20 30 3b 0a 7d 0a |n 0;.}.|
00000047
The last few lines of the compiled output file (a.out generally) for the above program reads:
\00__data_start\00__gmon_start__\00__dso_handle\00_IO_stdin_used\00__libc_csu_init\00_end\00_start\00__bss_start\00main\00_Jv_RegisterClasses\00__TMC_END__\00_ITM_registerTMCloneTable\00_init\00
In your case, it looks like the hexdump (or a similar) command was used on an a.out (i.e. object code file) file and those are the last few lines of the output.
Good luck!