2024 Getline not working in while loop

Getline not working in while loop

Author: eytb

August undefined, 2024

WebAfter constructing and checking the sentry object, performs the following: 1) Calls str.erase () 2) Extracts characters from input and appends them to str until one of the following occurs (checked in the order listed) a) end-of-file condition on input, in … WebNov 16, 2024 · Use this loop condition instead: while ( (ctr < (Nrow*Ncol)) && std::getline (myFile1, line)) This will end the loop when EITHER Nrow*Ncol items have been stored in the array OR std::getline () fails to read the next line in the file. That being said, consider using a std::vector instead of new [].

Why is cin.getline not working in for loop? – ITQAGuru.com

WebSep 22, 2024 · Your current program is looping endlessly because getline returns std::basic_istream, so while (getline ()) will never equate to 'false'. As @0x499602D2 has stated, your program is working as intended, but the extraction from getline can only end in two ways, as indicated by the reference here: WebApr 21, 2011 · Try cin.ignore () when you use cin before getline () function void inputstu () { cout << "Enter roll Number:"; cin >> roll_no; cin.ignore (); //ignore the withspace and enter key cout << "Enter name:"; getline (cin, stu_name); } Share Improve this answer Follow edited Dec 9, 2024 at 16:11 Zoe stands with Ukraine ♦ 26.6k 21 117 149 floor standing gas combi boiler

Problem with getline() after cin >> - GeeksforGeeks

WebDec 23, 2013 · getline, as it name states, read a whole line, or at least till a delimiter that can be specified. So the answer is "no", getline does not match your need. But you can do something like: inFile >> first_name >> last_name >> age; name = first_name + " " + last_name; Share Improve this answer Follow answered Dec 23, 2013 at 8:19 Johan … WebJan 13, 2014 · Std::getline itself does move the file towards the end – Gasim Jan 13, 2014 at 1:25 1 @Gasim, click on the link that chris provided to see why while (!eof ()) is "wrong". More specifically, it's not a good way to check this kind of loop since one must attempt to read the EOF before eof () is true. It doesn't tell you if you are "at" the EOF. WebMay 2, 2024 · You are you using variable x while it is commented. Un-comment it & code will compile. Second, to make the code quit when name is quit, need to change it to: while (stu [i-1].name != "quit") Notice the i-1 instead of i, and != instead of == Third, I guess you don't need want to print on last for loop the name "quit" - so need to print up to i-1 floor standing giraffe head ornament

c++ - Using getline in loop, storing to an array - Stack Overflow

Break in getline loop c++ - Stack Overflow

WebNov 4, 2012 · Now, your problem with getline has nothing to do with it being in a while loop. Look up getline in your VC++ Help Search and notice the example. and the … WebDec 30, 2011 · getline (cin, option); Since there's already a newline character in the buffer, getline has what it's looking for, and doesn't need to prompt the user. There are a few … floor standing gas boilers prices floor standing gas boilers

"WebTo do this, I used getline() in a while loop. With short circuiting, I have a flag. Here is my code: vector booktitles; string title; while (getline(cin, title) && title != "stop") { cin.ignore(50, '\n'); booktitles.push_back(title); cin.ignore(50, '\n'); } But this does not work as expected. Instead, I have to type "stop" multiple times. " - Getline not working in while loop

Getline not working in while loop

Why using while(!input.eof()) loop twice not working?

WebSep 2, 2012 · There are two overloads for std::getline: istream& getline ( istream& is, string& str, char delim ); istream& getline ( istream& is, string& str ); Three of your calls pass a literal string constant as the third parameter, where a single char is required. Use ' rather than " for character constants. WebMar 12, 2015 · Your problem is that stream's error flags get set when getline finds more characters than the maximum set. (see the description at std::basic_istream::getline count-1 characters have been extracted (in which case setstate (failbit) is executed). and If the function extracts no characters (e.g. if count < 1), setstate (failbit) is executed.

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WebSince you have not posted any code. I am going to take a guess. A common problem while using getline with cin is getline does not ignore leading whitespace characters.. If getline is used after cin >>, the getline() sees this newline character as leading whitespace, and it just stops reading any further.. How to resolve it? Call cin.ignore() before calling getline() Webwhile (getline(cin, line) && line != "&&") { While successfully got a line AND line is not "&&". Looks good. NOte: The new lines are stripped by the getline function because they're the token delimiter and leaving them in the returned token or leaving them in the stream would just cause problems. message = message + " " + line; Append line to ...

WebSep 6, 2024 · You check if it's not empty. If that's false, then it must be empty. Change your second if in the loop to just an else. Probably won't fix your problem, but it should be pointed out. Also, never omit curly braces. It's a bad habit that will bite you eventually if misused. – Carcigenicate Sep 6, 2024 at 11:38 Add a comment 1 Answer Sorted by: 0 WebThe above code is a C++ program that creates a Student Management System. The program takes in student data such as names, student numbers, DOB, Email and GPA, and stores it in an array. The program can add and remove students from the array, and also modify existing student data. The program can also print out a list of students and their ...

WebJun 18, 2024 · getline() not working second time in a while loop c++while-loop 15,950 Solution 1 cin >> yes; Right there, the user enters a letter, let's say 'y'. Then hits enter. This stores 2 characters in the input buffer, 'y' and '\n'. The 'y' gets stored in yes, but the '\n' remains. When you get to here again: getline (cin, option); WebJul 1, 2024 · The reason is that getline () reads till enter is encountered even if no characters are read. So even if there is nothing in the third line, getline () considers it as a single line. Further observe the problem in the second line. The code can be modified to …

Web2 days ago · It reads a line and discards it. 10 being the confused would-be programmer's way of writing '\n'. The author of GetLine probably intended that it skip until the end of the line, but if the stream is already at the end of a line it will skip the next line. If there is a read error, it enters an infinite loop.

WebMar 1, 2013 · When this offset reaches the end, it stops the first loop, ( eof () returns false). You need to reset this internal position back to the beginning of the file, before reading again. You do that by saying: myFile.clear (); // clear stream flags and error state myFile.seekg (0, ios::beg); // reset read position before the second loop. great pyrenees dog with brown markingsWebMar 31, 2014 · 1 1 ch is indeterminate when first used in this code, and as such even evaluating it is undefined behavior. You may want to fix that second. First, get rid of gets (), a function so vile it has been removed from the standard library. – WhozCraig Mar 31, 2014 at 7:11 1 Where have you used cin.getline (). I can't see it anywhere – coder hacker great pyrenees dog shedWeb1 Answer. The problem is you are at the end of the file when you go to actually store the data. Reads the file all the way to the end and then sets the EOF flag on the string. Then you get to. while (! openFile.eof ()) { for (int i = 0; i < counter; i++) { getline ( openFile, a [i], '/'); getline ( openFile, b [i], '/'); getline ( openFile, c ... floor standing glass shelvesWebFeb 25, 2024 · The getline () function does not ignore leading white space characters. So special care should be taken care of about using getline () after cin because cin ignores white space characters and leaves it in the stream as garbage. Program 1: Below is the C++ program to illustrate the same: C++ #include using namespace std; int main () { great pyrenees eating habitsWebSep 11, 2024 · CS121/main.cpp. # include // allows for reading and writing from a file. //was getting an extra line so had to add an if statement to nullify the extra line from the file. myfile. close (); //closes the txt file. floor standing headboards doubleWebApr 26, 2024 · This is because the Enter/Return you use to submit the info is getting extracted by getline (), which stops at the first '\n' character it sees. One way to fix it is use cin.ignore (), after your custom input. Mind that if reading from file, you should end the line after class input to get the same result as here. floor standing giraffe ornamentsWebNov 1, 2024 · My problem is that I am able to use getline (file, string) to read the lines in the second file in the first pass of the loop but am unable to see the values when i try and run the loop again. here is the code: great pyrenees dog shedding