Compilare: user.cpp: In function ‘int main()’: user.cpp:71:29: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘i64 {aka long long int}’ [-Wformat=] printf("%d %d\n", --x, y); ^ user.cpp:71:29: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘i64 {aka long long int}’ [-Wformat=] user.cpp: In function ‘char nextch()’: user.cpp:17:36: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, BMAX, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:53:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("3secv.in", "r", stdin); ^ user.cpp:54:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("3secv.out", "w", stdout); ^ user.cpp:71:30: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d\n", --x, y); ^