public/subjects/foldint.en.md

foldint

WARNING! VERY IMPORTANT!

For this exercise a function will be tested with the exam own main. However the student still needs to submit a structured program:

This means that:

• The package needs to be named package main.
• The submitted code needs one declared function main(func main()) even if empty.
• The function main declared needs to also pass the Restrictions Checker\(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
• Every other rules are obviously the same than for a program.

Instructions

Write a function called FoldInt that simulates the behavior of reduce from JavaScript.

The function should have as parameters a function, f func(int, int) int a slice of integers, slice []int and an int acc int. You should apply for each element of the slice the arithmetic function, saving and printing it. The function will be tested with our own functions Add, Sub, and Mul.

Expected function

func FoldInt(f func(int, int) int, arr []int, n int) {

}

Usage

Here is a possible program to test your function:

package main

func main() {
	table := []int{1, 2, 3}
	ac := 93
	FoldInt(Add, table, ac)
	FoldInt(Mul, table, ac)
	FoldInt(Sub, table, ac)
	fmt.Println()

	table = []int{0}
	FoldInt(Add, table, ac)
	FoldInt(Mul, table, ac)
	FoldInt(Sub, table, ac)
}

And its output :

student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
99
558
87

93
0
93
student@ubuntu:~/[[ROOT]]/test$