How to input an integer followed by a String in C++?

Question

I am stuck on how to use std::cin to read in an integer, followed by a space, and a String that comes after it.

Here is the store.txt file:

2 Hello how are you
6 Oh no
1 Welcome
5 We are closed

How do I read in a number at the start, followed by a space, and then read in the string after it?

For example, when I cin everything, then when I call the number 2, it will give me the string "Hello how are you".

Please [edit] your question to show the actual code you are having trouble with. Calling `operator>>` followed by `std::getline()` should suffice. — Remy Lebeau, Nov 16 '20 at 07:59
your question boils down to "how to read a stirng that contains spaces?" because you can apply what you already know about `cin` to read the number. You just need to give it a try. — 463035818_is_not_a_number, Nov 16 '20 at 08:22
Does this answer your question? https://stackoverflow.com/questions/5838711/stdcin-input-with-spaces — 463035818_is_not_a_number, Nov 16 '20 at 08:22
and if you mix `cin` and `getline` you will sooner or later run into this: https://stackoverflow.com/questions/21567291/why-does-stdgetline-skip-input-after-a-formatted-extraction — 463035818_is_not_a_number, Nov 16 '20 at 08:24

score 0 · Accepted Answer · answered Nov 17 '20 at 06:13

You can use map for storing strings

In the map the keys will be the numbers whereas the values will be the strings

You can simply store them in a map by using cin function for the numbers first then followed by getline function for the string and storing them to map

After doing this you can access the string by numbers in O(1) time by subscripting process

code

#include <bits/stdc++.h>
using namespace std;

int main() {
    map<long long,string> m;
    long long n;
    
    while(cin>>n){
        string s;
        getline(cin,s);
        
        m[n]=s;
    }

   // Accessing strings by numbers before them :)
    
   cout<<m[1]<<"\n";
   cout<<m[2]<<"\n";
   cout<<m[6]<<"\n";
   cout<<m[5]<<"\n";
    
}

[Why should I not #include ?](https://stackoverflow.com/q/31816095/995714), [Why is “using namespace std;” considered bad practice?](https://stackoverflow.com/q/1452721/995714) — phuclv, Nov 17 '20 at 06:33

How to input an integer followed by a String in C++?

1 Answers1

You can use map for storing strings

code