This C++ program is a **Calorie Calculator**.
* It has a small **database of foods** (Apple, Banana, Bread, Rice, Meat, Fish, Egg) stored in a `map`, with each food linked to its calories per 100 grams.
* The user can repeatedly:
1. **Choose a food item** from the list.
2. **Enter the quantity in grams**.
3. The program **calculates and adds the calories** for that portion to the running total.
* If the user enters a food that is not in the list, it shows an error message.
* The loop continues until the user types **‘n’** when asked if they want to add more food.
* Finally, the program displays the **total calories consumed**.