C++ code for CS162 class isn't adding user inputs to the total

Question

This code is designed to take an order, add that to the total_price variable, apply discounts based on the total price, then add a tip and echo all the information back to the user.

1. For some reason when I run the code, it isn't taking input from the user. I think it's related to the while statement but it outputs that my total_price is 0 after entering integers.

2. The tip calculation at the bottom isn't working correctly. It prompts the user to enter a tip value, but then skips to the end and says the final total is 0, without the user being able to enter any tip.

Thanks so much for the help!!

#include <iostream>
using namespace std;

int main()
{
    int total_price{0}; // This variable will contain the price for all orders
    int tip{0};
    int discount_total{0};
    int tip_total = tip + discount_total;

    cout << "Welcome!\nThis program is designed to help take your order.\n";
    cout << "Our discounts availible today are: \n10 percent off orders over $50, and 5 percent off orders between $25 and $50.\n";

    // This is where the user is prompted to enter the price of their order
    cout << "Please enter the price of your item: ";
    cin >> total_price;

    // No negative numbers will be accepted
    if (total_price <= 0)
    {
        cout << "Invalid number, please re-enter the price of your item: ";
    }
    // User can continue ordering unless typing No
    while (total_price > 0)
    {
        cout << "Is there anything else? If not type No: ";
        cin >> total_price;
    }
    // Once the user types No, it brings them to the tip section
    // Marks the end of the order
    if ("No")
    {
        cout << "Thank you. Your total price is " << total_price << endl;
    }

    // Discount modifications
    if (total_price >= 50)
    {
        discount_total = total_price * .05;
        cout << "Your new total is " << discount_total << " with the 10 percent   discount.\n";
    }

    else if (total_price >= 25 && total_price <= 50)
    {
        discount_total = total_price * .05;
        cout << "Your new total is " << total_price << " with the 5 percent discount.\n";
    }

    else
    {
        total_price = discount_total;
        cout << "Your total is the same, " << total_price << "\n";
    }

    // Tip calculation
    cout << " Feel free to add a tip! Please enter here: ";
    cin >> tip;

    if (tip > 0)
    {
        cout << "Your final total is: " << tip_total << " dollars";
    }
    else if (tip < 0)
    {
        cout << "Your tip is invalid, please enter a valid tip: ";
    }

    return 0;
}