Compilare: main.c: In function 'main': main.c:10:10: warning: passing argument 1 of 'fscanf' from incompatible pointer type [-Wincompatible-pointer-types] fscanf( "%d", &b); ^~~~ 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:10:16: warning: passing argument 2 of 'fscanf' from incompatible pointer type [-Wincompatible-pointer-types] fscanf( "%d", &b); ^ 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:10:16: warning: format not a string literal and no format arguments [-Wformat-security] fscanf( "%d", &b); ^~ main.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &a); ^~~~~~~~~~~~~~~~ main.c:10:2: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf( "%d", &b); ^~~~~~~~~~~~~~~~~