print() vs println()
print(value) // no newline
println(value) // adds a newlineUsing print()
print() writes text to standard output without adding a newline afterward, so the next thing printed continues right where the previous output left off.
Example: Using print()
// Entry point: execution of the program starts here
fun main() {
// Print "Hello, " to the console
print("Hello, ")
// Print "World!" to the console
print("World!")
// Print " No newline between these." to the console
print(" No newline between these.")
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Using println()
println() behaves like print() but appends a newline character at the end, so each call starts fresh on the next line of output.
Example: Using println()
// Entry point: execution of the program starts here
fun main() {
// Print "First line" to the console, with a trailing newline
println("First line")
// Print "Second line" to the console, with a trailing newline
println("Second line")
// Print "Third line" to the console, with a trailing newline
println("Third line")
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Printing Non-String Values
Both print() and println() accept numbers, booleans, and other types directly -- Kotlin converts them to their string representation automatically before printing.
Example: Printing Non-String Values
// Entry point: execution of the program starts here
fun main() {
// Print `42` to the console, with a trailing newline
println(42)
// Print `3.14` to the console, with a trailing newline
println(3.14)
// Print `true` to the console, with a trailing newline
println(true)
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Mixing print() and println()
Combining both lets you build a single line piece by piece with print() and then finish it with a println() call, which is useful for formatting output that has multiple parts.
print() for multi-part lines can get confusing -- string templates (covered later) are often clearer.Example: Mixing print() and println()
// Entry point: execution of the program starts here
fun main() {
// Print "Score: " to the console
print("Score: ")
// Print `95` to the console
print(95)
// Print "/100" to the console, with a trailing newline
println("/100")
// Print "Done!" to the console, with a trailing newline
println("Done!")
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- Using
print()repeatedly and being surprised that output runs together on one line without spaces or newlines. - Forgetting to add a space or separator manually when chaining several
print()calls together. - Assuming
println()with no arguments does nothing, when it actually prints just a newline.
print()outputs text with no trailing newline; the next output continues on the same line.println()outputs text followed by a newline, moving subsequent output to the next line.- Both functions can print numbers, booleans, and other types by converting them to their string form automatically.
println()called with no arguments simply prints an empty line.
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