[Solved] How would I allow user to use program again? [closed]

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If you want an operation to be preform *untill something you should use a loop

#include <iostream>
using namespace std;

int main()

{


    double bill, ten, fifteen, twenty, end, end2, end3;
    bool done = false;
    while(!done){
      cout << "Enter your bill's total: ";
        cin >> bill;

        ten = 0.1;
        fifteen = 0.15;
        twenty = 0.2;

        end = ten * bill;
        end2 = fifteen * bill;
        end3 = twenty * bill;

        cout << "10%: " << end << endl;
        cout << "15%: " << end2 << endl;
        cout << "20%: " << end3 << endl;
        cout << "again? y/n";
        char res;
        cin >> res;
        if(res == 'n')
            done=true;
       }
     system("pause");
     return 0;
    }

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solved How would I allow user to use program again? [closed]