Basic Calculator (School project)

#include <iostream>
using namespace std;
int main()
{
    char symbol;
    double a, b, answer;
    cout << "Enter your first number: ";
    cin >> a;
    cout << "Enter your second number: ";
    cin >> b;
    cout << "Enter the symbol of the operation you wish to perform.\n " << endl;
    cout << "Symbols:\n " << endl;
    cout << "Addition : +\n \nSubtraction: -\n \nMultiplication: *\n \nDivision: /" << endl;
    cout << "-----------------" << endl;
    cin >> symbol;

    if(symbol == '/' && b == 0){
        cout << "Are you trying to implode the universe? No? Then don't divide by zero.";
    }
    else if(symbol == '+'){
        answer = a + b;
        cout << " \nThe answer is: " << answer;
    }
    else if(symbol == '-'){
        answer = a - b;
        cout << " \nThe answer is: " << answer;
    }
    else if(symbol == '*'){
        answer = a * b;
        cout << " \nThe answer is: " << answer;
    }
    else if(symbol == '/'){
        answer = a / b;
        cout << " \nThe answer is: " << answer;
    }

    int x;
    cin>>x;
    return(0);
}