如何在 C++ 中输入一个整数后跟一个字符串？

Question

我无法理解如何使用 std::cin 读取整数，然后是 space，然后是字符串。

这是 store.txt 文件：

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

如何在开头读入数字，然后读入 space，然后读入后面的字符串？

例如，当我cin一切，那么当我拨打号码2时，它会给我字符串"Hello how are you"。

Answer 1

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";
    
}

如何在 C++ 中输入一个整数后跟一个字符串？

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

c++

user-input

You can use map for storing strings

code