Kotlin Output

Printing to the Console

The println() function is the most common way to produce output in Kotlin. It writes its argument to the standard output stream and then moves to a new line, so the next thing you print starts fresh below it.

fun main() {
    println("Line one")
    println("Line two")
    println("Line three")
}

println vs print

print() behaves just like println() except that it does not add a newline afterward. That means anything printed next will continue on the same line, which is useful when you want to build up a single line of output from several pieces.

fun main() {
    print("Name: ")
    println("Ada Lovelace")
    print("Role: ")
    print("Programmer")
}

Printing Variables and Expressions

Rather than concatenating strings with the + operator, Kotlin lets you embed values directly inside a string using string templates. A simple $variableName inserts a variable's value, while ${expression} lets you insert the result of any expression, including function calls and property access.

fun main() {
    val product = "Keyboard"
    val price = 49.99
    val quantity = 2
    println("$quantity x $product = ${price * quantity}")
}

• Use println when each piece of output should start on its own line
• Use print when you're assembling one line from multiple statements
• Prefer string templates ($var or ${expr}) over manual string concatenation
• Escape a literal dollar sign with \$ when you need one in your output