Compilare: main.cpp: In function 'int main()': main.cpp:172:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(auto it : precPrimes) ^~~ main.cpp:196:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' if(x != 1) ^~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:19:29: 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, 4096, fin); ^