Compilare: main.cpp: In function 'int read_int()': main.cpp:47:35: warning: array subscript has type 'char' [-Wchar-subscripts] while(!isDigit[c = read_char()] && c != '-'); ^ main.cpp:49:20: warning: array subscript has type 'char' [-Wchar-subscripts] while(isDigit[c]) ^ main.cpp: In function 'int main()': main.cpp:188:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < vp.size(); i++) ~~^~~~~~~~~~~ main.cpp: In function 'char read_char()': main.cpp:20:54: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buffer, sizeof(char), BUFFER_SIZE, fin); ^