Problem Statement

Given a string and defined variables or values, string interpolation is the replacement of defined character sequences in the string by values or variable values.

Note: The task is not to create a string interpolation routine, but to show a language's built-in capability.

Let's start with the solution:

"a$ = Mary had a X lamb."
a$ = word$(a$,1,"X")+"little"+word$(a$,2,"X")
print a$