Write a program to implement the operations of a four$-$function calculator. The program will first take two real $($floating point$)$ numbers as input from the user. You can safely assume the user will always input two numbers. The program then outputs the following message to prompt another user input:

Please select:

$+$: add two numbers.

$-$: subtract two numbers.

$*$: multiple two numbers.

$/$: divide two numbers.