How to store multiple inputs into a list C++

Question

I am new to C++ programming and am trying to create a program that asks the user questions. For example,

std::string siblings;
std::cout << "How many siblings do you have?";  //Let's say the user inputs 2
std::cin >> siblings;

for (int x=0;x<n;x++){
    std::string current;
    std::string sibling_info;
    std::cout << "What is the name + age of sibling #" << (x+1) << ": ";
    std::cin >> current;                    
    sibling_info.emplace_back(current);

I want the user to input "John 13" with a space in between, but whenever I put a space the program does not run the way I want it to and doesn't ask the user twice.

`std::getline(std::cin, current);` but you still have to parse the name from the number somewhere - you don't show us that code though — user3125280, Jan 19 '14 at 07:18
The same question: http://stackoverflow.com/questions/5838711/c-cin-input-with-spaces — Igor, Jan 19 '14 at 07:20

Alex · Accepted Answer · 2014-01-25T16:41:05.100

input from cin is white space delineated which includes spaces. std::cin >> current stores only the first word which was typed. In order to get two words you'd have to call cin twice, or switch to a different way of getting user input.

std::string current;
std::string age;
std::string sibling_info;
std::cout << "What is the name + age of sibling #" << (x+1) << ": ";
std::cin >> current; //you were missing a semicolon :p
std::cin >> age;    //added
current += " " + age;      //added       
sibling_info.emplace_back(current);

or using getline (you need to #include<string>)

std::string current;
std::string sibling_info;
std::cout << "What is the name + age of sibling #" << (x+1) << ": ";
current = getline(cin,current); //changed                      
sibling_info.emplace_back(current);

score 1 · Answer 2 · answered Jan 19 '14 at 07:20

1

One way to do it:

std::string current[2];
...
std::cin >> current[0] >> current[1];
sibling_info.emplace_back(current[0]+" "+current[1]);

answered Jan 19 '14 at 07:20

barak manos

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herohuyongtao · Answer 3 · 2014-01-19T07:42:33.097

1

Function emplace_back() can be used for vector, but not for string. So you need to change

std::string sibling_info;

to

std::vector<std::string> sibling_info;

Then you can call:

sibling_info.emplace_back(current);

At the same time, it will enable you to input any number of multiple inputs.

Check out here for more info.

edited Jan 19 '14 at 07:42

answered Jan 19 '14 at 07:23

herohuyongtao

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How to store multiple inputs into a list C++

3 Answers3