Compilare: main.c: In function 'main': main.c:14:16: warning: passing argument 1 of 'fscanf' from incompatible pointer type [-Wincompatible-pointer-types] fscanf("%d", &x); ^~~~ In file included from /usr/include/features.h:367:0, from /usr/include/stdio.h:27, from main.c:1: /usr/include/stdio.h:443:12: note: expected 'FILE * restrict {aka struct _IO_FILE * restrict}' but argument is of type 'char *' extern int __REDIRECT (fscanf, (FILE *__restrict __stream, ^ main.c:14:22: warning: passing argument 2 of 'fscanf' from incompatible pointer type [-Wincompatible-pointer-types] fscanf("%d", &x); ^ In file included from /usr/include/features.h:367:0, from /usr/include/stdio.h:27, from main.c:1: /usr/include/stdio.h:443:12: note: expected 'const char * restrict' but argument is of type 'int *' extern int __REDIRECT (fscanf, (FILE *__restrict __stream, ^ main.c:14:22: warning: format not a string literal and no format arguments [-Wformat-security] fscanf("%d", &x); ^~ main.c:23:17: warning: passing argument 1 of 'fprintf' from incompatible pointer type [-Wincompatible-pointer-types] fprintf("%d %d\n", nrdiv, suma); ^~~~~~~~~ In file included from /usr/include/stdio.h:936:0, from main.c:1: /usr/include/x86_64-linux-gnu/bits/stdio2.h:95:1: note: expected 'FILE * restrict {aka struct _IO_FILE * restrict}' but argument is of type 'char *' fprintf (FILE *__restrict __stream, const char *__restrict __fmt, ...) ^~~~~~~ main.c:23:28: warning: passing argument 2 of 'fprintf' makes pointer from integer without a cast [-Wint-conversion] fprintf("%d %d\n", nrdiv, suma); ^~~~~ In file included from /usr/include/stdio.h:936:0, from main.c:1: /usr/include/x86_64-linux-gnu/bits/stdio2.h:95:1: note: expected 'const char * restrict' but argument is of type 'int' fprintf (FILE *__restrict __stream, const char *__restrict __fmt, ...) ^~~~~~~ main.c:9:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^~~~~~~~~~~~~~~~~~~ main.c:14:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf("%d", &x); ^~~~~~~~~~~~~~~~