eof

I know that EOF and '\0' are of type integers, but if so shouldn't they have a fixed value? I printed both and got -1 for EOF and 0 for '\0' . But are these values fixed? I also had this int a=-1; printf("%d",a==EOF); //printed 1 Are the value for EOF and '\0' fixed integers? CB Bailey EOF is a macro which expands to an integer constant expression with type int and an implementation dependent negative value but is very commonly -1. '\0' is a char with value 0 in C++ and an int with the value 0 in C. The reason why printf("%d",a==EOF); resulted in 1 was because you didn't assign the value EOF

fp = open("a.txt") #do many things with fp c = fp.read() if c is None: print 'fp is at the eof' Besides the above method, any other way to find out whether is fp is already at the eof? fp.read() reads up to the end of the file, so after it's successfully finished you know the file is at EOF; there's no need to check. If it cannot reach EOF it will raise an exception. When reading a file in chunks rather than with read() , you know you've hit EOF when read returns less than the number of bytes you requested. In that case, the following read call will return the empty string (not None ). The

This question already has an answer here: How do I check to see if a text file is empty or does not exist in c++? 2 answers Is there an easy way to check if a file is empty. Like if you are passing a file to a function and you realize it's empty, then you close it right away? Thanks. Edit, I tried using the fseek method, but I get an error saying 'cannot convert ifstream to FILE *'. My function's parameter is myFunction(ifstream &inFile) Perhaps something akin to: bool is_empty(std::ifstream& pFile) { return pFile.peek() == std::ifstream::traits_type::eof(); } Short and sweet. With concerns to

I have a n X 2 matrix stored in a text file as it is. I try to read it in C++ nb_try=0; fin>>c_tmp>>gamma_tmp; while (!fin.eof( )) //if not at end of file, continue reading numbers { // store cs_bit.push_back(c_tmp); gammas_bit.push_back(gamma_tmp); nb_try++; // read fin>>c_tmp; assert(!fin.fail( )); // fail at the nb_try=n if(fin.eof( ))break; fin>>gamma_tmp; // get first number from the file (priming the input statement) assert(!fin.fail( )); } The first assert failes, i.e. fin.fail( ) is true, when nb_try==n, which happens when it tries to read the first number which does not exist. But how