why the "getline" command does not get recognized by VS? - getline

The word "getline" is a red and underlined, which indicate an error:
#include <iostream>
using namespace std;
string ReadName()
{
string Name;
cout << "Please Enter Your Name: " << endl;
getline(cin, Name);
return Name;
}
void PrintName(string Name)
{
cout << "\nYour name is " << Name << endl;
}
int main()
{
PrintName(ReadName());
return 0;
}
The VS Gives an error regarding getline

Related

this vector has vector probelem is not working

The problem is it prints the full name but not the rest of the lines about the person.
Could someone, please guide me?
I do really appreciate your help!
auto itr = find(my_vec.begin(), my_vec.end(), search );
if(itr != my_vec.end())
{
std::cout << "Match found " << search << std::endl;
std::cout << "\nFull name: " << search << std::endl;
} else {
std::cout << "Match not found "<< std::endl;
}
There are a few style problems with your code:
No need to explicitly initialize strings, they will be empty by default (see here).
Keep a consistent style. For example, either always start brackets in the same line as the function signature or in the next line.
No need to close the file explicitly at the end of the function, this is done when the object goes out of scope (see (destructor) here).
No need to include <map> and <iomanip> headers.
Don't keep unused variables.
Give suggestive names to your variables.
Do not return error codes to the OS when the app is working as it should. Not finding a name is not an error, is it?
It seems your file has 6 entries per contact, so all you have to do is print 5 more lines. You do not need to store the lines in a vector, just parse and print them as you go. Here is an example:
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <fstream>
void findContact(std::string fullName, std::string contactListPath) {
std::ifstream inFile{contactListPath};
if (!inFile) {
std::cerr << "File could not be open!" << std::endl;
return;
}
std::string line;
while (std::getline(inFile, line)) {
if (line == fullName) {
std::cout << "Match found: \n";
std::cout << "\nFull name: " << fullName;
std::cout << "\nAddress: " << (std::getline(inFile, line), line);
std::cout << "\nE-mail: " << (std::getline(inFile, line), line);
std::cout << "\nPhone: " << (std::getline(inFile, line), line);
std::cout << "\nBirthday: " << (std::getline(inFile, line), line);
std::cout << "\nNote: " << (std::getline(inFile, line), line) << std::endl;
return;
}
}
std::cout << "Match not found " << std::endl;
}
int main() {
std::string fullName;
std::string contactListPath;
std::cout << "Enter full name to search: ";
std::getline(std::cin, fullName);
std::cout << "Enter path to contact list: ";
std::getline(std::cin, contactListPath);
findContact(fullName, contactListPath);
return 0;
}
If every entry contains 6 lines. Then you can print all the lines starting from the line that you found like:
auto itr = find(my_vec.begin(), my_vec.end(), search );
if(itr != my_vec.end())
{
std::cout << "Match found " << std::endl;
// print the next 6 lines
for(int remaining = 6;remaining > 0 && itr!=my_vec.end(); itr++,remaining--) {
std::cout << *itr << std::endl;
}
} else {
std::cout << "Match not found "<< std::endl;
}

std array too few template arguments

When runnig my project i see these problems. Does anyone know the solution?
'std array': too few template arguments.
cannot use this indirection on type 'std::array'.
too few arguments for class template "std::array".
I tried to remove using namespace std; into std::array or cli::array but it didn't helped a lot
#include "pch.h"
#include "windows.h"
#include <iostream>
#include <string>
using namespace System;
using namespace std;
class Dog
{
public:
Dog();
Dog(int initAge);
~Dog();
int GetAge();
void SetAge(int Age);
void GawGaw(string S);
private: int itsAge;
};
Dog::Dog()
{ }
Dog::Dog(int initAge)
{
itsAge = initAge;
}
Dog::~Dog()
{ }
int Dog::GetAge()
{ return itsAge;
}
void Dog::SetAge(int Age)
{ itsAge = Age;
}
void Dog::GawGaw(string S)
{ cout << S + " -> GawGaw \n";
}
int main(array<System::String ^> ^args)
{
cout << "\n My Favorite dogs \n";
Dog Bob;
cout << "\nBob is a dog who is ";
cout << Bob.GetAge() << " years old. \n";
Bob.SetAge(7);
cout << "No. Bob is a dog who is ";
cout << Bob.GetAge() << " years old. \n";
Bob.GawGaw("Bob");
Dog* Fox = new Dog(10);
cout << "\nFox is a dog who is ";
cout << Fox->GetAge() << " years old. \n";
Fox->SetAge(12);
cout << "No. Fox is a dog who is ";
cout << Fox->GetAge() << " years old. \n";
Fox->GawGaw("Fox");
Dog Rex(5);
cout << "\nRex is a dog who is ";
cout << Rex.GetAge() << " years old. \n";
Rex.SetAge(8);
cout << "No. Rex is a dog who is ";
cout << Rex.GetAge() << " years old. \n";
Rex.GawGaw("Rex");
Console::ReadLine();
return 0;
}

Looping back again to Start

now I'm Having problem in repeating the loop after it finished doing the first and i want to try it again without exiting the program? I've been using while loop to do it but still no joy. so i decided to do the if statement. But the Array only accept 4 strings then it exit. Any one who can help? TIA.
#include "stdafx.h"
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
using namespace std;
template <typename T>
void GetContents(T& Input);
template <typename T>
void DisplayContents(const T& Input);
int main()
{
int PASS = 0;
// To Display the unsorted and sorted Book Titles
std::vector<std::string> books;
GetContents(books);
std::cout << "\nMy original library (number of books: " << books.size() << "):\n\n";
DisplayContents(books);
std::sort(books.begin(), books.end());
std::cout << "\nMy sorted library (number of books: " << books.size() << "):\n\n";
DisplayContents(books);
std::cout << "Press 1 to try again, else to quit: ";
std::cin >> PASS;
std::cout << "\n";
if (PASS == 1)
{
GetContents(books);
}
else
{
return 0;
}
// to input All book titles
template <typename T>
void GetContents(T& Input)
{
const int MAX = 5;
string bookName;
std::cout << "Enter a Book Titles:\n> ";
for (int i = 0; i < MAX; i++)
{
std::getline(std::cin, bookName);
Input.push_back(bookName);
std::cout <<">";
}
}
//Display All input book titles
template <typename T>
void DisplayContents(const T& Input)
{
for (auto iElement : Input)
{
std::cout << iElement << '\n';
}
std::cout << '\n';
system("pause");
}

How to enter 'quit' to close program?

How do I instead of entering a name, enters 'quit' and it will close the program?
string name;
cout << "Enter a name: "<< " ";
std::getline (std::cin,input);
input[0] = toupper (input[0]);
C++ is rusty something like this...
string name;
cout << "Enter a name: "<< " ";
std::getline (std::cin,input);
input[0] = toupper (input[0]);
if (input[0] == 'quit')
{
std::exit;
}
Using Visual C++
#include "stdafx.h"
#include <iostream>
#include <string>
using namespace std;
int main(int argc, char* argv[])
{
string strinput;
while (strinput != "quit")
{
cout << "Enter a name: " << endl;
cin.clear();
cin >> strinput;
if(strinput =="quit")
exit(0);
}
return 0;
}

Can't find the error

This program is a nightmare, it wont even give me errors when ran, visual studios tells me nothing and i need some help
#include <iostream>
using namespace std;
class Textbook
{
private:
char *aPtr;
char *tPtr;
int yearPub;
int numPages;
char bookType;
public:
Textbook(char *, char *, int, int, char);
void display();
void operator=(Textbook&);
};
Textbook::Textbook(char*string = NULL, char*string2 = NULL, int ypub = 0, int npages = 0, char btype = 'X')
{
aPtr = new char[strlen(string) +1];
strcpy(aPtr, string);
tPtr = new char[strlen(string2) +1];
strcpy(tPtr, string2);
yearPub = ypub;
numPages = npages;
bookType = btype;
}
void Textbook::display()
{
cout << "The name of the author is: " << *aPtr << endl;
cout << "The Title of the book is: " << *tPtr << endl;
cout << "The year it was published is: " << yearPub << endl;
cout << "The number of pages is: " << numPages << endl;
cout << "The initial of the title is: " << bookType << endl;
return;
}
void Textbook::operator=(Textbook& newbook)
{
if(aPtr != NULL) //check that it exists
delete(aPtr);// delete if neccessary
aPtr = new char[strlen(newbook.aPtr) + 1];
strcpy(aPtr, newbook.aPtr);
if(tPtr != NULL) //check that it exists
delete(tPtr); // delete if neccessary
tPtr = new char[strlen(newbook.tPtr) + 1];
strcpy(tPtr, newbook.tPtr);
yearPub = newbook.yearPub;
numPages = newbook.numPages;
bookType = newbook.bookType;
}
void main()
{
Textbook book1("sehwag", "Programming Methods", 2009, 200, 'H');
Textbook book2("Ashwin", "Security Implementation", 2011, 437, 'P');
Textbook book3;
book1.display();
book2.display();
book3.display();
book3 = book1;
book2 = book3;
book1.display();
book2.display();
book3.display();
}
im not sure if the problem lies in the default constructor but that's about the only thing i could think of, but im not sure at all on how to fix it.
Problem is with the default-parameters in the constructor.
You can't do those kind of operations with NULL-pointers.
Textbook book3;
crashes your program.
Change:
cout << "The name of the author is: " << *aPtr << endl;
cout << "The Title of the book is: " << *tPtr << endl;
to:
cout << "The name of the author is: " << aPtr << endl;
cout << "The Title of the book is: " << tPtr << endl;
Also change:
aPtr = new char[strlen(string) +1];
strcpy(aPtr, string);
to:
if (string != NULL)
{
aPtr = new char[strlen(string) +1];
strcpy(aPtr, string);
}
else
{
aPtr = new char[1];
aPtr[0] = '\0';
}
and ditto for tptr and string2.
The reason you need this checking is because you have NULL as a default value for your two string inputs, so when you call the constructor with no arguments (as is the case with book3) these strings are just NULL pointers. Calling functions such as strlen or strcat with a NULL pointer will result in an exception as you have seen.
Ideally you should not be using C-style strings with C++ - use C++ strings instead - this will help to avoid problems such as the above.

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