I have a loop that reads each line in a file using getline(). istream is; string line; while (!getline(is, line).eof()) { } I noticed that calling getline() like this also seems to work: while (getline(is, line)) What's going on here? getline() returns a stream reference. Is it being converted to a pointer somehow? Is this actually...
Firstly, I'm pretty new to C++. I believe that getline() isn't a standard C function, so #define _GNU_SOURCE is required to use it. I'm now using C++ and g++ tells me that _GNU_SOURCE is already defined: $ g++ -Wall -Werror parser.cpp parser.cpp:1:1: error: "_GNU_SOURCE" redefined <command-line>: error: this is the location of the previ...
I have this code, int main() { std::string st; std::stringstream ss; ss<<"hej hej med dig"<<std::endl; std::getline(ss,st,' '); std::cout <<"ss.rdbuf()->str() : " << ss.rdbuf()->str(); std::cout <<"ss.rdbuf() : " << ss.rdbuf(); return 0; } Giving me this output ss.rdbuf()->str() : hej hej med dig ...
The experiment I am currently working uses a software base with a complicated source history and no well defined license. It would be a considerable amount of work to rationalize things and release under a fixed license. It is also intended to run a a random unixish platform, and only some of the libc's we support have GNU getline, but ...
Just for clarification, I'm referring to the global getline() function in the string class. What I want to do is to have something like this: int main() { wifstream in(L"textfile.txt"); someFunc(in); return 0; } void someFunc(const wistream& read) { wstring buff; while(getline(read, buff)) { //do some proces...
Is there a reason why if in my program I am asking the user for input, and I do: int number; string str; int accountNumber; cout << "Enter number:"; cin >> number; cout << "Enter name:"; getline(cin, str); cout << "Enter account number:"; cin >> accountNumber; Why after inputting the first number, it outputs "Enter Name", followed im...
I am trying to read a csv using get line to extract three variables separated by commas. Name, Course, and Grade. I am reading in the first line fine but it puts in weird new line breaks and sends the format into a cluster. Here is my code : #include "header.h" string student::GetCourse() { return course; } string student::GetNa...
Hello there, I'm trying to collect user's input in a string variable that accepts whitespaces for a specified amount of time. Since the usual cin >> str doesn't accept whitespaces, so I'd go with std::getline from <string> Here is my code: #include <iostream> #include <vector> #include <string> #include <algorithm> using namespace st...
I am writing a program that will read lines from an infile using getline into strings, convert the strings to c-strings containing the first m nonwhitespace characters of the string, then concatenate the c-strings into a single char array. A sample file might look something like this: 5 //number of rows and columns in a grid 2 //...
This is driving me insane. All I want to do is pass a command to the terminal from awk, where the command is a string concatenated together made from other variables. The documentation for awk says that something like "echo" $1 | getline var should put the value of $1 into var. But this is not the case. What am I missing here? I sh...
I'm trying to use std:getline() but getting a strange runtime error: malloc: * error for object 0x10000a720: pointer being freed was not allocated * set a breakpoint in malloc_error_break to debug This is the code that produces this error: //main.cpp #include <iostream> #include <sstream> int main (int argc, char * const argv[]...
Hi, how do I check for end-of-file using the string::getline function? Coz, using .eof() is not recommended as it wont signal eof until I attempt to read beyond eof. ...
Hi! I'm attempting to convert dates from one format to another: From e.g. "October 29, 2005" to 2005-10-29. I have a list of 625 dates. I use Awk. The conversion works -- most of the time. Hovewer, sometimes the conversion won't happen at all, and the variable supposed to hold the (converted) date remains undefined. This always happen...
In my program, fin is an ifstream object and song is a string. When the program runs, it opens music.txt and reads from the file. I try to read each line with: getline(fin,song); I've tried all variations of getline but it keep ignoring the first 10 or so characters of each line before it starts picking up characters. For instance, if ...
So I am writing a program that deals with reading in and writing out to a file. I use the getline() function because some of the lines in the text file may contain multiple elements. I've never had a problem with getline until now. Here's what I got. The text file looks like this: John Smith // Client name 123...
Here's my program so far: int main() { char choice = 'D'; string inputString; cout << "Please input a string." << endl; getline(cin, inputString); LetterCount letterCount(inputString); while(choice != 'E') { cout << "Please choose from the following: " << endl << "A) Count the number o...
Ok so I have a problem with getline. I have a file that contains a couple strings. I created it by myself and I have each string on a seperate line. Ex. textfile.txt Line 1 Line 2 Line 3 Line 4 //Little snip of code ifstream inFile("textfile.txt"); getline(inFile, string1); When I debug the program and ask it...
Here is my code: #include <iostream> #include <stdlib.h> #include <fstream> using namespace std; int main() { string line; ifstream inputFile; inputFile.open("input.txt"); do { getline(inputFile, line); cout << line << endl; } while (line != "0"); return 0; } input.txt content: 5 9 2 9 3 8 ...
A common piece of code I use for simple string splitting looks like this: inline std::vector<std::string> split(const std::string &s, char delim) { std::vector<std::string> elems; std::stringstream ss(s); std::string item; while(std::getline(ss, item, delim)) { elems.push_back(item); } return elems; } S...
Basically my task is having to sort a bunch of strings of variable length ignoring case. I understand there is a function strcasecmp() that compares cstrings, but doesn't work on strings. Right now I'm using getline() for strings so I can just read in the strings one line at a time. I add these to a vector of strings, then convert to cst...