Compilare: user.c: In function ‘main’: user.c:37:5: warning: passing argument 1 of ‘printf’ from incompatible pointer type [enabled by default] printf(fp,"%d",a+b); ^ In file included from user.c:1:0: /usr/include/stdio.h:339:12: note: expected ‘const char * restrict’ but argument is of type ‘struct FILE *’ extern int printf (__const char *__restrict __format, ...); ^ user.c:45:5: warning: passing argument 1 of ‘printf’ from incompatible pointer type [enabled by default] printf(fp,"%d",0); ^ In file included from user.c:1:0: /usr/include/stdio.h:339:12: note: expected ‘const char * restrict’ but argument is of type ‘struct FILE *’ extern int printf (__const char *__restrict __format, ...); ^ user.c:48:5: warning: passing argument 1 of ‘printf’ from incompatible pointer type [enabled by default] printf(fp,"%d",d); ^ In file included from user.c:1:0: /usr/include/stdio.h:339:12: note: expected ‘const char * restrict’ but argument is of type ‘struct FILE *’ extern int printf (__const char *__restrict __format, ...); ^