␡
- 2.1 Conditional Expressions
- 2.2 Statement Termination
- 2.3 Block Expressions and Assignments
- 2.4 Input and Output
- 2.5 Loops
- 2.6 Advanced for Loops and for Comprehensions
- 2.7 Functions
- 2.8 Default and Named Arguments L1
- 2.9 Variable Arguments L1
- 2.10 Procedures
- 2.11 Lazy Values L1
- 2.12 Exceptions
- Exercises
This chapter is from the book
This chapter is from the book
This chapter is from the book
This chapter is from the book
2.4 Input and Output
To print a value, use the print or println function. The latter adds a newline character after the printout. For example,
print("Answer: ")
println(42)
yields the same output as
println("Answer: " + 42)
There is also a printf function with a C-style format string:
printf("Hello, %s! You are %d years old.\n", "Fred", 42)
You can read a line of input from the console with the readLine function. To read a numeric, Boolean, or character value, use readInt, readDouble, readByte, readShort, readLong, readFloat, readBoolean, or readChar. The readLine method, but not the other ones, takes a prompt string:
val name = readLine("Your name: ")
print("Your age: ")
val age = readInt()
printf("Hello, %s! Next year, you will be %d.\n", name, age + 1)