getline

问题 i have spent hours trying to get this to work and have been all over your website and nothing is working for me..... basically i am working on a banking system for an assignment and this is the final thing that i need to do in order to complete my unit. i am trying to read multiple lines from within a text file so i can output them. these will be my previous transactions. i have managed to get it to store my values but i cannot, for the life of me, read the lines due to the fact that the

问题 This question already has answers here : cin and getline skipping input [duplicate] (4 answers) Closed 4 years ago . Im doing exercices from c++ primer, and trying to do a program that recieves as input a word and a line. If when i ask for a word (with cin) I press enter, then the program just skips the next lines and doest ask for a line (with the getline)... and if i write an entire phrase in the cin (like "hello beautifull world") then the first word ("hello") is captured by the cin and

问题 There are several questions on this site referring to getline not working, the apparent solution is that there are remaining newline characters in the buffer that need to be cleared, supposedly with cin.ignore() . I've tried so many variations of this and nothing seems to work, all I'm trying to do is simple console input and cin >> string isn't an option because the string might have spaces. Here is my code. void prompt(std::string * str) { cout << "> "; cin.sync(); cin.get(); cin.ignore(256

问题 I tested following codes to clarify my understanding to istream::getline() : #include <iostream> #include <sstream> using namespace std; int main() { string s("abcd efgh\nijklmnopqrst"); string s1; stringstream ss(s); ss >> s1; cout << s1 << endl; ss.getline(&s1[0], 250, '\n'); cout << s1 << endl; ss >> s1; cout << s1 << endl; getchar(); return 1; } then the console printed: abcd efg ijklmnopqrst but in my opinon it should be abcd efgh ijklmnopqrst Besides, I found the size of s1 after

问题 Using c++14. I have read many posts regarding the problem. If I run this code below, it jumps over the getline lines. #include <iostream> #include "main_menu.h" void MainMenu::AddTest() { std::string courseName = ""; std::string testName = ""; std::string date = ""; std::cout << "Enter course name: " << std::endl; std::getline(std::cin, courseName); std::cout << "Enter test name: " << std::endl; std::getline(std::cin, testName); std::cout << "Enter test date: " << std::endl; std::getline(std:

问题 I know that getline(cin,_string); works perfectly but this dosen't: char* _chArr = new char; getline(cin,_chArr); Even this alson doesn't work: char* _chArr = new char[30]; getline(cin,_chArr); Isn't char* a string?? 回答1: Well think of it logically. the char* is just a pointer to a character type memory block. You have to assign it some amount of dynamic memory and then copy data into it using strcpy() or manually. Direct input is not supported in C++. Strings are in fact objects which

问题 I am trying to figure out how to take a string that a user enters with space as a single string . Moreover, after that, the user will include other strings separated by commas. For example, foo,Hello World,foofoo where foo is one string followed by Hello World and foofoo . What I have right now, it would split Hello World into two strings instead of combining them into one. int main() { string stringOne, stringTwo, stringThree; cout << "Enter a string with commas and a space"; cin >>

问题 class MovieData { private: string Title; string Director; int Year; int Time; public: MovieData(); void setTitle(string Title); void setDirector(string Director); void setYear(int Year); void setTime(int Time); string getTitle(); string getDirector(); int getYear(); int getTime(); }; MovieData::MovieData() { Title = ""; Director = ""; Year = 0; Time = 0; } void MovieData::setTitle(string title) { Title = title; } void MovieData::setDirector(string director) { Director = director; } void

问题 okay i'm stumped on how to do this. I managed to get to the line I want to replace but i don't know how to replace it. say a file called file.txt containts this: 1 2 3 4 5 and I want to replace line 3 so that it says 4 instead of 3. How can I do this? #include <Windows.h> #include <iostream> #include <fstream> #include <string> using namespace std; fstream file; string line; int main(){ file.open("file.txt"); for(int i=0;i<2;i++){ getline(file,line); } getline(file,line); //how can i replace?

问题 string add_text() { const int string_size(30); string add_string; cin.getline (add_string,string_size,'\n'); return add_string; } When I compile the program with the function above, I get an error. Note that I am using using namespace std; earlier in the program. If it helps I am using Code Blocks and have also tried compiling the program using the Visual Studio 11 Professional Beta. The Error: C:\Users\Jonathan\Documents\Code_Blocks\test_12\main.cpp|32|error: no matching function for call to