Grading Students Solution in Kotlin -HackerRank

Problem

HackerLand University has the following grading policy :

• Every student receives a grade in the inclusive range from 0 to 100 .
• Any grade less than 40 is a failing grade.

Sam is a professor at the university and likes to round each student’s grade according to these rules:

• If the difference between the grade and the next multiple of 5 is less than 3, round grade up to the next multiple of 5.
• If the value of grade is less than 38, no rounding occurs as the result will still be a failing grade.

Examples

• grade = 84 round to 85 (85–84 is less than 3)
• grade = 29 do not round (result is less than 40)
• grade = 57 do not round (60–57 is 3 or higher)

Given the initial value of grade for each of Sam’s n students, write code to automate the rounding process.

Function Description

Complete the function gradingStudents in the editor below.
gradingStudents has the following parameter(s):

• int grades[n]: the grades before rounding

Returns

• int[n]: the grades after rounding as appropriate

Input Format
The first line contains a single integer, n, the number of students. Each line of i the n subsequent lines contains a single integer, grade[i].

Sample Input

4 
73 
67 
38 
33

Sample Output

75 
67 
40 
33

ANSWER

fun gradingStudents(grades: Array<Int>): Array<Int> {
var gradeList : MutableList<Int> = ArrayList()
   grades.forEach() { item ->
        if  (item >= 38 && item % 5 > 2 ) {
            val total = item + (5 - item % 5)
            gradeList.add(total)      
        } else {
            gradeList.add(item)      
        }
   }
return gradeList.toTypedArray()
}

Explanation

1. Student 1 received a 73, and the next multiple of 5 from 73 is 75 . Since 75–73 < 3, the student’s grade is rounded to 75.
2. Student 2 received a 67, and the next multiple of 5 from 67 is 70. Since 70–67 = 3, the grade will not be modified and the student’s final grade is 67.
3. Student 3 received a 38, and the next multiple of 5 from 38 is 40. Since 40–38 < 3, the student’s grade will be rounded to 40.
4. Student 4 received a grade below 38, so the grade will not be modified and the student’s final grade is 33.