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:

#!/usr/bin/awk -f
BEGIN {
	str="Mary had a # lamb."
	gsub(/#/, "little", str)
	print str
}