Compilare: user.c: In function ‘main’: user.c:19:2: warning: passing argument 1 of ‘fscanf’ from incompatible pointer type [enabled by default] fscanf("%d%d", &a, &b); ^ In file included from /usr/include/features.h:346:0, from /usr/include/stdio.h:28, from user.c:1: /usr/include/stdio.h:425:12: note: expected ‘struct FILE * restrict’ but argument is of type ‘char *’ extern int __REDIRECT (fscanf, (FILE *__restrict __stream, ^ user.c:19:2: warning: passing argument 2 of ‘fscanf’ from incompatible pointer type [enabled by default] fscanf("%d%d", &a, &b); ^ In file included from /usr/include/features.h:346:0, from /usr/include/stdio.h:28, from user.c:1: /usr/include/stdio.h:425:12: note: expected ‘const char * restrict’ but argument is of type ‘int *’ extern int __REDIRECT (fscanf, (FILE *__restrict __stream, ^ user.c:20:2: warning: passing argument 1 of ‘fprintf’ from incompatible pointer type [enabled by default] fprintf("%d", cmmdc(a,b)); ^ In file included from user.c:1:0: /usr/include/stdio.h:333:12: note: expected ‘struct FILE * restrict’ but argument is of type ‘char *’ extern int fprintf (FILE *__restrict __stream, ^ user.c:20:2: warning: passing argument 2 of ‘fprintf’ makes pointer from integer without a cast [enabled by default] fprintf("%d", cmmdc(a,b)); ^ In file included from user.c:1:0: /usr/include/stdio.h:333:12: note: expected ‘const char * restrict’ but argument is of type ‘int’ extern int fprintf (FILE *__restrict __stream, ^