Reimplement the programs below in the CPS style Convert helloUp, doubleUp and mainFun into the CPS functions helloUp_k , doubleUp_k , mainFun_k .

INSTRUCTIONS TO CANDIDATES

ANSWER ALL QUESTIONS

Name: WRITE YOUR NAME HERE
1 / TEST HELPER
2 def passed(points: Int) {
3 require(points >=0)
4 if (points == 1) print(s"\n*** Tests Passed (1 point) ***\n")
5 else print(s"\n*** Tests Passed ($points points) ***\n") 6 }

Problem 1 (20 points): CPS Style Transformation
Reimplement the programs below in the CPS style.

A (10 points)
Convert helloUp, doubleUp and mainFun into the CPS functions helloUp_k , doubleUp_k , mainFun_k . They should take continuations that are of type String => String .

def helloUp(x: String): String = { "Hello " + x
}

def doubleUp(x: String): String = { x + x
}

def mainFun(x: String): String = { doubleUp(helloUp(x) + "World")
}

1 ??? // YOUR CODE HERE

I
1 //BEGIN TEST
2 assert(helloUp_k("World", x => x) == "HelloWorld", "Test 1, Set  1
3 assert(doubleUp_k("World", x => x) == "WorldWorld", "Test 2 Set  1
4 assert(mainFun_k("Donkey", x => x) == "HelloDonkeyWorldHelloDonke
5 passed(5)
6 //END TEST

1 //BEGIN TEST
2 assert(helloUp_k("Hello", x => ("*"+x+"*")) == "*HelloHello*", "T
3 assert(doubleUp_k("HelloWorld", x => ("*"+x+"*")) == "*HelloWorld
4 assert(mainFun_k("Cruel", x => ("*"+x+"*")) == "*HelloCruelWorldH
5 passed(5)
6 //END TEST

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