In a small village in Amman, Jordan, there lives a young child named Omar who loves math. He wants to create a simple calculator to help his friends with basic arithmetic operations. However, he knows that not everyone is familiar with the concept of variables and conditions. So, he needs your help to design a program that can take in two numbers, an operator (+, -, *, /), and display the result. Omar's friend has asked him to make sure the calculator handles division by zero correctly.