Printing Output

print is the everyday way to show output. It can take several values, and two options change how they're joined and ended.

Example

print("Hello")
print("A", "B", "C")
print("A", "B", "C", separator: "-")
print("Loading...", terminator: "")
print(" done")
print(42)
print([1, 2, 3])
print()
print("End")

Expected output

Hello
A B C
A-B-C
Loading... done
42
[1, 2, 3]

End

Line by line:

• Several values are separated by a space by default.
• separator: changes what goes between them.
• terminator: changes what goes at the end (a new line by default). terminator: "" keeps the next output on the same line.
• print() with nothing prints an empty line.

separator: and terminator: are argument labels — named arguments. You'll see these throughout Swift, and the Functions lessons explain how they work.

Practice

Print the numbers 1, 2, and 3 on one line separated by |.

print(1, 2, 3, separator: " | ")

1 | 2 | 3