Why does this program close instead of displaying an output?

Question

I am new here and a student in a basic programming class at community college. I am having trouble understanding why this program simply closes instead of displaying the output.

#include <iostream>
#include <iomanip>
using namespace std;

int main()
{
    int quantity;   // contains the amount of items purchased 
    float   itemPrice;        // contains the price of each item
    float   totalBill;        // contains the total bill.
    
    cout << setprecision(2) << fixed << showpoint;  // formatted output 
    cout << "Please input the number of items bought " << endl;
    cin >> quantity;
    // Fill in the prompt to ask for the price.
    cout << "Please enter Item Price" << endl;
    // Fill in the input statement to bring in the price of each item.
    cin >> itemPrice;
    // Fill in the assignment statement to determine the total bill.
    totalBill = quantity * itemPrice;            
    // Fill in the output statement to print total bill, // with a label to the screen.
    cout << "The bill is $" 
         << totalBill << endl;
         
return 0;
}