Compilare: user.c:4:1: warning: return type defaults to ‘int’ [enabled by default] fun(){ ^ user.c: In function ‘fun’: user.c:6:1: warning: zero-length gnu_printf format string [-Wformat-zero-length] printf(""); ^ user.c:8:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:30:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &T); ^ user.c:34:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%s", number); ^