Scala | Format and Formatted Method

Last Updated : 29 Mar, 2019

Sometimes in Competitive programming, it is essential to print the output in a given specified format. Most users are familiar with printf function in C. Let us see discuss how we can format the output in Scala. When a String contains values as well as texts succeeding it then formatting is required for changing values and adding texts enclosing it. Example :

I have written 30 articles

Note:

In Scala Formatting of strings can be done utilizing two methods namely format() method and formatted() method.
These methods have been approached from the Trait named StringLike.

Format method

Format method can be utilized for format strings and you can even pass parameters to it, where %d is used for Integers and %f is used for floating-points or Doubles. Example :

Scala

// Scala program of format 
// method

// Creating object
object GFG
{

    // Main method
    def main(args: Array[String])
    {

        // Creating format string
        val x = "There are %d books and" + 
                    "cost of each book is %f"

        // Assigning values 
        val y = 15
        val z = 345.25

        // Applying format method
        val r = x.format(y, z)

        // Displays format string 
        println(r)
    }
}

Output:

There are 15 books and cost of each book is 345.250000

Example :

Scala

// Scala program of format for
// strings and characters.

// Creating object
object GFG
{

    // Main method
    def main(args: Array[String])
    {

        // Creating format string
        val x = "Geet%c is a %s."

        // Assigning values 
        val a = 'a'
        val b = "coder"

        // Applying format method
        val r = x.format(a, b)

        // Displays format string 
        println(r)
    }
}

Output:

Geeta is a coder.

Here, %s is used for strings and %c is used for characters.

Formatted method

This method can be utilized on Integer, Double as well as Strings, as it can apply on any object. Example :

Scala

// Scala program for formatted
// method

// Creating object
object GFG
{

    // Main method
    def main(args: Array[String])
    {

        // Assigning values 
        val x = 30

        // Applying formatted method
        val r = x.formatted("I have written %d articles.")

        // Displays format string 
        println(r)
    }
}