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val pi = 3.14159
val formatted = f"The value of pi is approximately $pi%.2f."
println(formatted) // Output: The value of pi is approximately 3.14.
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val name = "Alice"
val age = 30
val message = s"My name is $name and I'm $age years old."
println(message) // Output: My name is Alice and I'm 30 years old.