Compilare: main.c: In function 'main': main.c:16:13: warning: passing argument 1 of 'fprintf' from incompatible pointer type [-Wincompatible-pointer-types] fprintf("%d", div); ^~~~ 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:16:19: warning: passing argument 2 of 'fprintf' makes pointer from integer without a cast [-Wint-conversion] fprintf("%d", div); ^~~ 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:16:5: warning: format not a string literal and no format arguments [-Wformat-security] fprintf("%d", div); ^~~~~~~ main.c:4:16: warning: variable 'out' set but not used [-Wunused-but-set-variable] FILE *in, *out; ^~~ main.c:7:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &a); ^~~~~~~~~~~~~~~~~~~~ main.c:8:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &b); ^~~~~~~~~~~~~~~~~~~~