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fun printCircumferenceAndArea(radius: Double): Unit {
 
    fun calCircumference(radius:Double)= (2 * Math.PI) * radius
    val circumference = "%.2f".format(calCircumference())
 
    fun calArea(radius:Double)= (Math.PI) * Math.pow(radius, 2.0)
    val area = "%.2f".format(calArea())
    // ... 
}

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class Student {
    var kotlinScore = 0.0
     
    infix fun addKotlinScore(score: Double): Unit {
        this.kotlinScore = kotlinScore + score
    }
}

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val student = Student()
student addKotlinScore 95.00
print(student.kotlinScore) // will print "95.0"

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"Chike" should startWith("ch")
myList should contain(myElement) 
"Chike" should haveLength(5)
myMap should haveKey(myKey)

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public infix fun <A, B> A.to(that: B): Pair<A, B> = Pair(this, that)

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val nigeriaCallingCodePair = 234 to "Nigeria"
val nigeriaCallingCodePair2 = Pair(234, "Nigeria") // Same as above

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val nigeriaCallingCodePair3 = 234.to("Nigeria") // same as using 234 to "Nigeria"

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val callingCodesMap: Map<Int, String> = mapOf(234 to "Nigeria", 1 to "USA", 233 to "Ghana")

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val callingCodesPairMap: Map<Int, String> = mapOf(Pair(234, "Nigeria"), Pair(1, "USA"), Pair(233, "Ghana"))

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map(
  1 to "one",
  2 to "two",
  3 to "three"
)