我将如何提示用户让他们选择在 C++ 中重新运行程序

Question

The option could look like: "To run the program again enter 'y', to exit enter 'n'. In my program I ask the user to enter a package A,B, or C. Then I calculate the price based on different factors. But I have to give the user the option to select another package an rerun the entire program?

#include <iostream>

using namespace std;

int main() {
bool finished = false;
char choice;
int choice_a = 995;
int choice_b = 1995;
int choice_c = 3995;
int message_units;
int price;
bool selected = false;

do {

    do {          //Prompt user to enter package
        cout << "Which package do you choose (enter A, B or C)" << endl;

        cin >> choice;

        if (choice == 'A') { price = choice_a; selected = true; }
        else if (choice == 'B') { price = choice_b; selected = true; }
        else if (choice == 'C') { price = choice_c; selected = true; }
        cout << endl;
    }

    while (selected == false);
            //Prompt user to enter message units
    cout << "How many message units (enter 1 - 672)" << endl;

    cin >> message_units;

           //calculate message units
    if((message_units > 5) && (choice == 'A')){
        price += 100 * (message_units - 5);
    }
      if((message_units > 15) && (choice == 'B')){
        price += 50 * (message_units - 15);
    }



                    //Total Cost
    cout << "Your total cost is " << price/100 << "." << price%100 << 

Answer 1

#include <iostream>

using namespace std;

int main() {
    bool finished = false;
    char choice;
    int choice_a = 995;
    int choice_b = 1995;
    int choice_c = 3995;
    int message_units;
    int price;
    bool selected = false;
    char rerunp;

rerunprog:
    do {
        do {          //Prompt user to enter package
            cout << "Which package do you choose (enter A, B or C)" << endl;
            cin >> choice;

            if (choice == 'A') { price = choice_a; selected = true; }
            else if (choice == 'B') { price = choice_b; selected = true; }
            else if (choice == 'C') { price = choice_c; selected = true; }
            cout << endl;
        }
        while (selected == false);

        //Prompt user to enter message units
        cout << "How many message units (enter 1 - 672)" << endl;
        cin >> message_units;

        //calculate message units
        if((message_units > 5) && (choice == 'A')){
            price += 100 * (message_units - 5);
        }
        if((message_units > 15) && (choice == 'B')){
            price += 50 * (message_units - 15);
        }

        cout<<"Do you want to run again?(y/n)";
        cin >> rerunp;
        while(rerunp == 'y')
            goto rerunprog;

        //Total Cost
        cout << "Your total cost is " << price/100 << "." << price%100 << ;

        cout<<"Do you want to run again?(y/n)";
        cin >> rerunp;
        while(rerunp == 'y')
            goto rerunprog;

Answer 2

Try this:

#include <iostream>

using namespace std;

static const int choice_a = 995;
static const int choice_b = 1995;
static const int choice_c = 3995;

int main()
{
    char choice;
    int message_units;
    int price;

    do
    {
        // Prompt user to enter package
        do
        {
            cout << "Which package do you choose - A, B or C? Or X to exit" << endl;
            cin >> choice;
            cout << endl;

            switch (choice)
            {
                case 'a': 
                    choice = 'A'; 
                case 'A': 
                    price = choice_a;
                    break;

                case 'b': 
                    choice = 'B';
                case 'B': 
                    price = choice_b;
                    break;

                case 'c': 
                    choice = 'C';
                case 'C': 
                    price = choice_c;
                    break;

                case 'x':
                case 'X':
                    return 0;

                default:
                    continue;
            }

            break;
        }
        while (true);

        // Prompt user to enter message units
        cout << "How many message units (enter 1 - 672)" << endl;
        cin >> message_units;

        // calculate message units
        if ((message_units > 5) && (choice == 'A')) {
            price += (100 * (message_units - 5));
        }
        if ((message_units > 15) && (choice == 'B')) {
            price += (50 * (message_units - 15));
        }

        //Total Cost
        cout << "Your total cost is " << price/100 << "." << price%100 << endl;

        // Prompt user to enter another package
        cout << "Do you want to enter another package? (Y/N)" << endl;
        cin >> choice;
    }
    while ((choice == 'y') || (choice == 'Y'));

    return 0;
}