C++ getline function continuous loop

Question

I am trying to use a getline function in the following code, however it just enters an indefinite loop. Should I enter 1, it will then jump to the another iteration of the loop and ask for my menu choice again, rather than asking for my name.

Does anyone have any idea where I'm going wrong?

#include <iostream>
#include <string>
#include <ncurses.h>

using namespace std;
// DECLARE

void menu();
void menu_act_on_choice();
void string_function();


// CODE

void menu_act_on_choice(int choice_in) {
    switch (choice_in) {
        case 1:
            string_function();
            break;
            
        default:
            break;
    }
}

void string_function() {
    string user;
    cout << "Enter your first and last: ";
    getline(cin, user);
    cout << user << endl;
}


void menu() {
    int choice = 0;
    do {
    cout << "1. String functions" << endl;
    cout << "2. Array functions" << endl;
    cout << "3. Exit" << endl;
    cout << "Enter choice: ";
    cin >> choice;
    menu_act_on_choice(choice);
    } while(choice != 3);
    
}

//EXECUTE
int main() {
    menu();
}

Answer 1

When you enter the menu choice which is read by

cin >> choice;

you ended that with the Enter key right?

That Enter key will be added to the input buffer as a newline. But cin >> choice will not read it, instead that happens with the getline call which reads it as an empty line.

The simple solution is to ignore all input until (and including.) the newline after getting the menu choice.

cin >> choice;
cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');

Answer 2

Add cin.ignore(); before getline line.