Compilare: main.cpp: In function 'int main()': main.cpp:177:13: warning: unused variable 'el' [-Wunused-variable] int el = 0, el2 = 0; ^~ main.cpp:177:21: warning: unused variable 'el2' [-Wunused-variable] int el = 0, el2 = 0; ^~~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:16:29: 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); ^