Getting whole line from files - c++

Question

My program Can read strings and integer, but the problem is when I add spaces for strings like names it does not execute the viewOrder() function. I am New to programming and start learning c++ as my frist language at 19 years old, hoping that someone can help me. I am doing an uniform ordering system.
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
struct orderDetails{
string name;
int studentNumber;
string address;
string dressCode;
int quantity;
};
void takeOrder(){
orderDetails order;
ofstream file ("database.dat" , ios::app);
cin.ignore();
cout << "Enter name: ";
getline(cin,order.name);
cout << "Enter Student Number: ";
cin >> order.studentNumber;
cin.ignore();
cout << "Enter Address: ";
getline(cin,order.address);
cout << "Enter Dress Code: ";
cin >> order.dressCode;
cout << "Enter Quantity: ";
cin >> order.quantity;
file << order.name << endl
<< order.studentNumber << endl
<< order.address << endl
<< order.dressCode << endl
<< order.quantity << endl;
file.close();
}
void viewOrder(){
ifstream database("database.dat");
orderDetails order;
while(database >> order.name >> order.studentNumber >> order.address >> order.dressCode >> order.quantity){
cout << endl << order.name << endl << order.studentNumber << endl << order.address << endl << order.dressCode << endl << order.quantity << endl;
}
}
int main(){
cout << "1.Take Order \n2.View Order \n3.Exit \nPlease Choose A Number: ";
int choice;
cin >> choice;
switch(choice){
case 1:
system("CLS");
takeOrder();
break;
case 2:
system("CLS");
viewOrder();
break;
default:
break;
}
return 0;
}

Answer 1

This is an old problem. You need to learn about the difference between formatted and unformatted input.
If you have a line of text like
abc def
and you read this into std::strings with
inputFileStream >> s1 >> s2
Then the input "abc" and "def" will be read into the to string-variables. Ok. But, the newline ('\n') at the end of the line will not be consumed. If you write an additional
inputFileStream >> s1 >> s2
to read the next line, then the inserter operator >> will skip the whitespace '\n' and read the strings as you would expect.
But, if you use std::getline after the initial formatted input, then, and remember that there is still a not-consumed '\n' at the end of the line, only an empty string and the newline will be read.
To overcome this situation, you can use std::ws. Please see here for a description. So, you simply add this in your std::getline statement.
Like this:
std::getline(ifs >> std::ws, line);
This will eat up all white spaces (including '\n') in front of the next text that you want to read.
To explain it better. This is a nested statement. So, first ifs >> std::ws is executed. This operation returns again ifs and then the std::getline will be done. You can of course also use ifs >> std::ws outside of the std::getline. That is in most cases better than calling ignore.
But remember. This is only necessary, if you switch from formatted to unformatted input.