Write a C++ program that reads the Capacity (in

gallons)of an automobile fuel
tank, and Miles per gallon this
automobile can be driven. It outputs the number
of miles this automobile is driven without refueling .

Sure, here's an example C++ program that prompts the user to enter the capacity of the fuel tank in gallons and the miles per gallon the automobile can be driven. It then calculates and outputs the number of miles the automobile can be driven without refueling.

```cpp
#include <iostream>

int main() {
double tankCapacity, milesPerGallon;

// Prompt the user to enter tank capacity in gallons
std::cout << "Enter the capacity of the fuel tank (in gallons): ";
std::cin >> tankCapacity;

// Prompt the user to enter miles per gallon
std::cout << "Enter the miles per gallon the automobile can be driven: ";
std::cin >> milesPerGallon;

// Calculate the number of miles the automobile can be driven without refueling
double milesWithoutRefueling = tankCapacity * milesPerGallon;

// Output the result
std::cout << "The automobile can be driven " << milesWithoutRefueling << " miles without refueling.\n";

return 0;
}
```

To execute this code:

1. Open a text editor and copy the code into a new file (e.g., `fuel.cpp`).
2. Save the file with a `.cpp` extension.
3. Compile the code using a C++ compiler (e.g., GCC or Clang) by running the command `g++ fuel.cpp -o fuel` in the terminal.
4. Run the compiled program by executing the command `./fuel`.
5. The program will prompt you to enter the tank capacity and miles per gallon, and then it will output the calculated number of miles without refueling.

Feel free to modify the program as needed to suit your requirements.