Hola Benedict usa un compilador de este tipo para ayudarte en los errores.
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En tu caso saltan todos estos:
main.c:1:2: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘^’ token
x^2 si (xmod4)=0
^
In file included from /usr/include/stdio.h:74:0,
from main.c:15:
/usr/include/libio.h:306:3: error: unknown type name ‘size_t’
size_t __pad5;
^
/usr/include/libio.h:310:67: error: ‘size_t’ undeclared here (not in a function)
char _unused2[15 * sizeof (int) - 4 * sizeof (void *) - sizeof (size_t)];
^
/usr/include/libio.h:338:62: error: expected declaration specifiers or ‘...’ before ‘size_t’
typedef __ssize_t __io_read_fn (void *__cookie, char *__buf, size_t __nbytes);
^
/usr/include/libio.h:347:6: error: expected declaration specifiers or ‘...’ before ‘size_t’
size_t __n);
^
/usr/include/libio.h:469:19: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘_IO_sgetn’
extern _IO_size_t _IO_sgetn (_IO_FILE *, void *, _IO_size_t);
^
In file included from main.c:15:0:
/usr/include/stdio.h:337:20: error: expected declaration specifiers or ‘...’ before ‘size_t’
int __modes, size_t __n) __THROW;
^
/usr/include/stdio.h:386:44: error: expected declaration specifiers or ‘...’ before ‘size_t’
extern int snprintf (char *__restrict __s, size_t __maxlen,
^
/usr/include/stdio.h:390:45: error: expected declaration specifiers or ‘...’ before ‘size_t’
extern int vsnprintf (char *__restrict __s, size_t __maxlen,
^
/usr/include/stdio.h:709:15: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fread’
extern size_t fread (void *__restrict __ptr, size_t __size,
^
/usr/include/stdio.h:715:15: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fwrite’
extern size_t fwrite (const void *__restrict __ptr, size_t __size,
^
In file included from /usr/include/stdio.h:937:0,
from main.c:15:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:23:61: error: expected declaration specifiers or ‘...’ before ‘size_t’
extern int __sprintf_chk (char *__restrict __s, int __flag, size_t __slen,
^
/usr/include/x86_64-linux-gnu/bits/stdio2.h:25:62: error: expected declaration specifiers or ‘...’ before ‘size_t’
extern int __vsprintf_chk (char *__restrict __s, int __flag, size_t __slen,
^
/usr/include/x86_64-linux-gnu/bits/stdio2.h:52:50: error: expected declaration specifiers or ‘...’ before ‘size_t’
extern int __snprintf_chk (char *__restrict __s, size_t __n, int __flag,
^
/usr/include/x86_64-linux-gnu/bits/stdio2.h:53:7: error: expected declaration specifiers or ‘...’ before ‘size_t’
size_t __slen, const char *__restrict __format,
^
/usr/include/x86_64-linux-gnu/bits/stdio2.h:55:51: error: expected declaration specifiers or ‘...’ before ‘size_t’
extern int __vsnprintf_chk (char *__restrict __s, size_t __n, int __flag,
^
/usr/include/x86_64-linux-gnu/bits/stdio2.h:56:8: error: expected declaration specifiers or ‘...’ before ‘size_t’
size_t __slen, const char *__restrict __format,
^
In file included from /usr/include/features.h:374:0,
from /usr/include/stdio.h:27,
from main.c:15:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:61:1: error: expected declaration specifiers or ‘...’ before ‘size_t’
__NTH (snprintf (char *__restrict __s, size_t __n,
^
/usr/include/x86_64-linux-gnu/bits/stdio2.h:74:1: error: expected declaration specifiers or ‘...’ before ‘size_t’
__NTH (vsnprintf (char *__restrict __s, size_t __n,
^
In file included from /usr/include/stdio.h:937:0,
from main.c:15:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:227:39: error: expected declaration specifiers or ‘...’ before ‘size_t’
extern char *__gets_chk (char *__str, size_t) __wur;
^
/usr/include/x86_64-linux-gnu/bits/stdio2.h:241:49: error: expected declaration specifiers or ‘...’ before ‘size_t’
extern char *__fgets_chk (char *__restrict __s, size_t __size, int __n,
^
In file included from /usr/include/features.h:374:0,
from /usr/include/stdio.h:27,
from main.c:15:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:246:14: error: expected declaration specifiers or ‘...’ before ‘size_t’
extern char *__REDIRECT (__fgets_chk_warn,
^
In file included from /usr/include/stdio.h:937:0,
from main.c:15:
/usr/include/x86_64-linux-gnu/bits/stdio2.h: In function ‘fgets’:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:260:20: error: expected ‘)’ before ‘__n’
if ((size_t) __n > __bos (__s))
^
/usr/include/x86_64-linux-gnu/bits/stdio2.h: At top level:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:266:15: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘__fread_chk’
extern size_t __fread_chk (void *__restrict __ptr, size_t __ptrlen,
^
In file included from /usr/include/features.h:374:0,
from /usr/include/stdio.h:27,
from main.c:15:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:269:15: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘__fread_alias’
extern size_t __REDIRECT (__fread_alias,
^
/usr/include/x86_64-linux-gnu/bits/stdio2.h:273:15: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘__fread_chk_warn’
extern size_t __REDIRECT (__fread_chk_warn,
^
In file included from /usr/include/stdio.h:937:0,
from main.c:15:
/usr/include/x86_64-linux-gnu/bits/stdio2.h:282:1: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘fread’
fread (void *__restrict __ptr, size_t __size, size_t __n,
^
main.c:17:1: warning: return type defaults to ‘int’ [-Wimplicit-int]
main(){
^
main.c: In function ‘main’:
main.c:29:8: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘int *’ [-Wformat=]
printf("%d",&f1);
^
main.c:33:8: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘int *’ [-Wformat=]
printf("%d",&f2);
^
main.c:37:8: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘int *’ [-Wformat=]
printf("%d",&f3);
^
main.c:41:8: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘int *’ [-Wformat=]
printf("%d",&f4);
^
main.c:21:1: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&x);
^