Write a VBA code to convert an arbitrary decimal integer number to equivalent binary number.

Specific requirements:

1. Use InputBox function to request the input for an arbitrary decimal integer;

2. Convert the decimal integer to equivalent binary number;

3. Return the binary number in a message box.

Below functions and symbol may be useful in your VBA code: Cstr( ): can convert a number in ( ) to a string; Int( ): can trim off fractional part and just return integer part of the number in ( ); & : can combine multiple strings into one string.