getline() function reading blank lines in recursive call in c++

Question

#include <iostream>

using namespace std;

string input() {
    string str;
    char ch;

    cout << "Enter string: ";
    getline(cin, str);
    cout << "\n" << str;

    cout << "\nChange the string? ";
    cin >> ch;

    if (tolower(ch) == 'y')
        input();

    return str;
}

int main() {
    string str;
    str = input();

    //some other code
}

When trying to change the string, the getline() function is reading some whitespace or blank line. I am not getting how to resolve this issue. I know that getline() is used to read the entire line (including white spaces).

The first time it is working fine, but for the next recursive call, getline() is reading something blank. How to make getline() wait for user input?

In your recursive call, what do you do with the value the call returns? — Some programmer dude, Aug 12 '18 at 17:15
No, I mean `if (...) input();` What happens with the value that *this* call to `input()` returns? — Some programmer dude, Aug 12 '18 at 17:17
I know what happens after entering character into ch, but how to prevent that from happening — Arihant Bedagkar, Aug 12 '18 at 17:19
Nothing happens there... the next recursive call overwrites it... — Arihant Bedagkar, Aug 12 '18 at 17:20
Then you don't know how scoping and variable life-time works. Please [get a few good books](https://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list/388282#388282) and read them. In short, local variables in a function are local to *the specific call* of the function. Calling a function twice (even recursively) will create a completely *new* set of local variables for each call. — Some programmer dude, Aug 12 '18 at 17:21

getline() function reading blank lines in recursive call in c++

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