Compilare: user.cpp: In function ‘int main()’: user.cpp:108:31: warning: format ‘%d’ expects argument of type ‘int’, but argument 2 has type ‘i64 {aka long long int}’ [-Wformat=] printf("%d\n", sum); ^ user.cpp: In function ‘char nextch()’: user.cpp:23:36: 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:87:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma5.in", "r", stdin); ^ user.cpp:88:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("suma5.out", "w", stdout); ^