Solution of inputting whole line string after inputting integer

The solution of entering an integer and then an entire line of string

When the input is an integer , Then when you need to input the whole line of string later , It will be very troublesome to deal with , And I have met several times in the competition , This time, make a good arrangement of the methods .

First, let's talk about my own mistakes , When inputting as follows ：

2
4
hello worl d
hello cpp ++a

The input content is two integers , Then two whole lines of string , This situation , If we use string and cin Under normal circumstances, it is necessary to use getline Of ：

signed main(){
    
    int a,b;
    string t;
    string s;
    cin>>a>>b;
    getline(cin,s);
    getline(cin,t);
    cout<<a<<" "<<b<<"\n";
    cout<<s<<"\n"<<t;
    return 0;
}

In this case, the output is as follows ：

2 4

hello worl d

We will find that 4 The following carriage return will be used as the end sign of the first string . So we have to find a way to get rid of this carriage return , Then I use it getchar()：

signed main(){
    
    int a,b;
    string t;
    string s;
    cin>>a>>b;
    getchar();
    getline(cin,s);
    getline(cin,t);
    cout<<a<<" "<<b<<"\n";
    cout<<s<<"\n"<<t;
    return 0;
}

But sometimes there will be some problems , Sometimes something goes wrong , This is also a problem that has been bothering me .

What if this problem is solved , It's better to use cin.get()：

signed main(){
    
    int a,b;
    string t;
    string s;
    cin>>a>>b;
    cin.get();
    getline(cin,s);
    getline(cin,t);
    cout<<a<<" "<<b<<"\n";
    cout<<s<<"\n"<<t;
    return 0;
}

Output ：

2 4
hello worl d
hello cpp ++a