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asking for input after computation

tdleanz (8)
So i ask for input, user enters 50, then program displays 1-55 and outputs the sqrt of pi. After I display the sqrt of pi, how do i bring up the "Please enter an integer or 'q' to quit" again and ask for input? Right now i have to enter s, but i don't want to have to do that. Thanks

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#include <iostream>
#include <cstdlib>
#include <cmath>
#include <iomanip>
#include <string>
#include <cstring>
#include <thread>

#define PI 3.14

using namespace std;

bool thread_done = false;

void number_output(int n){
    bool thread_break = false;
    double calculatePi;

	for(int i = 0; i < n; i++){
        std::cout << (i+1) << std::endl;

        if(thread_done == true){
      		thread_break = true;
            break;
        }

    }

     //   std::cout << "The square root of PI is " << setprecision(3) << calculatePi << "." << std::endl;
    std::cout << "The square root of PI is 1.77"<< std::endl;

    if(thread_break == false)
        cout<<"Program Done. Enter 's' to continue... ";
    thread_done = true;
}


int main(){
    // for the program to keep executing until control + c is pressed, or 'q' is entered
    bool done = false;
    string choice;
    string input;
    double calculatePi;

    while(!done){

        std::cout << "Please enter an integer or 'q' to quit" << std::endl;

        // user input
        cin >> choice;

        if(choice == "q"){
            done = true;
        }else{
            int input = atoi(choice.c_str());     // Converting string to integer
            thread_done = false;

            std::cout << "You have asked to compute the square root of PI " << input <<  " times:" << std::endl;
		
			// for loop to increment number output
		//	for(int i = 0; i < input; i++){
		//		std::cout << (i+1) << std::endl;
		//	}

				for(int j = 0; j <= input; j++){
					calculatePi= sqrt(PI);

			}
           // std::cout << "The square root of PI is " << setprecision(3) << calculatePi << "." << std::endl;

			if(input == 0){
				std::cout << "squre root of PI is 0" << std::endl;
			}
			
			
            std::thread t1 (number_output, input);
            string validate = "";

            while(true){
                std::getline(std::cin, validate);
                if(validate == "s"){
                    cout<<"Program Terminated Gracefully!"<<endl;
                    thread_done = true;
                    t1.detach();
                    break;
                }
            }
		}
	}
}
coder777 (8439)
If you don't want to enter "s" just remove the entire loop on line 80.
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