eof

问题 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

问题 I have a CSV file (24.1 MB) that I cannot fully read into my R session. When I open the file in a spreadsheet program I can see 112,544 rows. When I read it into R with read.csv I only get 56,952 rows and this warning: cit <- read.csv("citations.CSV", row.names = NULL, comment.char = "", header = TRUE, stringsAsFactors = FALSE, colClasses= "character", encoding= "utf-8") Warning message: In scan(file, what, nmax, sep, dec, quote, skip, nlines, na.strings, : EOF within quoted string I can read

问题 To read some text file, in C or Pascal, I always use the following snippets to read the data until EOF: while not eof do begin readline(a); do_something; end; Thus, I wonder how can I do this simple and fast in Python? 回答1: Loop over the file to read lines: with open('somefile') as openfileobject: for line in openfileobject: do_something() File objects are iterable and yield lines until EOF. Using the file object as an iterable uses a buffer to ensure performant reads. You can do the same

问题 I am currently reading K&R's book and typing in the examples from the first section, and there are a couple of examples such as this: while((c = getchar()) != EOF) { //do something } I am testing these examples on a Windows box and thus running the compiled exe files from the cmd prompt. To test the example above, how do I simulate an EOF ? That is, basically how can I make the loop stop when testing the example from the command prompt? 回答1: To enter an EOF, use: ^Z ( Ctrl Z ) in Windows ^D

问题 I'm writing a library to simplify my network programming in future projects. I'm wanting it to be robust and efficient because this will be in nearly all of my projects in the future. (BTW both the server and the client will be using my library so I'm not assuming a protocol in my question) I'm writing a function for receiving strings from a network stream where I use 31 bytes of buffer and one for sentinel. The sentinel value will indicate which byte if any is the EOF. Here's my code for

问题 I serialize multiple objects into a binary archive with Boost. When reading back those objects from a binary_iarchive , is there a way to know how many objects are in the archive or simply a way to detect the end of the archive ? The only way I found is to use a try-catch to detect the stream exception. Thanks in advance. 回答1: I can think of a number of approaches: Serialize STL containers to/from your archive (see documentation). The archive will automatically keep track of how many objects

问题 i was studying EOF character in c and came across a program : #include <stdio.h> main() { int c= 0; while((c = getchar())!=EOF) putchar(c); } its all good it is giving proper o/p but how do i come out of the loop by entering a EOF character which i entered and it did nothing. 回答1: To stimulate EOF in stdin , If you are on windows or DOS press CTRL+Z Or if you are running linux or some other OS, press CTRL+D 回答2: I dont think there is an EOF character,and CTRL+Z and CTRL+D are used to inform

问题 Can feof(stdin) and cin.eof() produce discordant results? I would expect them not to do so, but I guess I am missing something. Does the standard say anything about this? Consider the following example, when no input is given. This can either be done by typing the shortcut for EOF in the terminal, or by redirecting the input on /dev/null (Unix), or with empty stdin sequence on ideone.com... #include <cstdio> #include <iostream> int main() { using namespace std; char ch; cin >> ch; cin.clear()

问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . I have a BASH project for university and I have two errors that I don't understand here is my script BASH : #!/bin/bash proc_name=`cat /proc/cpuinfo | grep 'model name' | cut -d':' -f2 |cut -d'@' -f1 | uniq`; proc_freq=`cat /proc/cpuinfo | grep 'model name' | cut -d':' -f2 |cut -d'@' -f2 | uniq`; proc_core=`cat

问题 I was working on an example for this answer and I noticed that http://ideone.com will let me read till EOF from cin but Visual Studio 2015 will not. For example, given the program: string i; while(cin >> i) cout << i << endl; I can give the input: Lorem Ipsum And http://ideone.com will terminate: http://ideone.com/22uNOr Visual Studio 2015 will continue waiting for input however until I press Ctrl + Z and hit Enter Is this a gcc/Visual Studio difference or just something http://ideone.com is