How can I improve this program?
I am a newbie programmer learning some C++. One of the exercises in my book asked me to write a basic console calculator that takes 2 numbers and an operation as input, I have done so and the program compiles (both with clang++ and g++) and runs fine.
I would like to know if:
-I am making mistakes in my code that the compiler is allowing me to get away with.
-If my code can be made more resource efficient and/or shorter in length.

Here is the program:
    
    #include <iostream>
    using namespace std;
    int main()
    {
	char operation;
	double first_number;
	double second_number;
	double solution = 0;

	cout << "This is a basic calculator program, enter the first number.\n";
	cout << "First number:";
	cin >> first_number;

	cout << "Enter second number:";
	cin >> second_number;

	cout << "\nEnter an operation to perform, choose one from this list: +,-,/,*\n";
	cout << "Enter your operation:";
	cin >> operation;
	cin.ignore();

	if (operation != '+' && operation != '-'&& operation != '/'&& operation != '*')
		{
			cout << "\nInvalid operation! Aborting!";
			cout << "\nPress Enter to exit.";
			cin.get();
			return 1;
		}//end if

	if (operation == '+')
		{
			solution = first_number + second_number;
			cout << "\nYour answer is: " << solution << "\nPress Enter to exit.\n";
			cin.get();
			return 0;
		}//end if

	if (operation == '-')
		{
			solution = first_number - second_number;
			cout << "\nYour answer is: " << solution << "\nPress Enter to exit.\n";
			cin.get();
			return 0;
		}//end if

	if (operation == '*')
		{
			solution = first_number * second_number;
			cout << "\nYour answer is: " << solution << "\nPress Enter to exit.\n";
			cin.get();
			return 0;
		}//end if

	if (operation == '/')
		{
			if ( second_number == 0 )
			{
				cout << "\nYou can't divide by zero! Aborting!";
				cout << "\nPress Enter to exit.";
				cin.get();
				return 2;
			}//end if
			solution = first_number / second_number;
			cout << "\nYour answer is: " << solution << "\nPress Enter to exit.\n";
			cin.get();
			return 0;
		}//end if

	
	return 0;
    }//end main
How can I improve this program?
===

I am a newbie programmer learning some C++. One of the exercises in my book asked me to write a basic console calculator that takes 2 numbers and an operation as input, I have done so and the program compiles (both with clang++ and g++) and runs fine.
I would like to know if:
-I am making mistakes in my code that the compiler is allowing me to get away with.
-If my code can be made more resource efficient and/or shorter in length.

Here is the program:
    
    #include <iostream>
    using namespace std;
    int main()
    {
	char operation;
	double first_number;
	double second_number;
	double solution = 0;

	cout << "This is a basic calculator program, enter the first number.\n";
	cout << "First number:";
	cin >> first_number;

	cout << "Enter second number:";
	cin >> second_number;

	cout << "\nEnter an operation to perform, choose one from this list: +,-,/,*\n";
	cout << "Enter your operation:";
	cin >> operation;
	cin.ignore();

	if (operation != '+' && operation != '-'&& operation != '/'&& operation != '*')
		{
			cout << "\nInvalid operation! Aborting!";
			cout << "\nPress Enter to exit.";
			cin.get();
			return 1;
		}//end if

	if (operation == '+')
		{
			solution = first_number + second_number;
			cout << "\nYour answer is: " << solution << "\nPress Enter to exit.\n";
			cin.get();
			return 0;
		}//end if

	if (operation == '-')
		{
			solution = first_number - second_number;
			cout << "\nYour answer is: " << solution << "\nPress Enter to exit.\n";
			cin.get();
			return 0;
		}//end if

	if (operation == '*')
		{
			solution = first_number * second_number;
			cout << "\nYour answer is: " << solution << "\nPress Enter to exit.\n";
			cin.get();
			return 0;
		}//end if

	if (operation == '/')
		{
			if ( second_number == 0 )
			{
				cout << "\nYou can't divide by zero! Aborting!";
				cout << "\nPress Enter to exit.";
				cin.get();
				return 2;
			}//end if
			solution = first_number / second_number;
			cout << "\nYour answer is: " << solution << "\nPress Enter to exit.\n";
			cin.get();
			return 0;
		}//end if

	
	return 0;
    }//end main