The solution of Homework day 10/20/2021

src/main/kotlin/Courses.kt

@@ -0,0 +1,36 @@
+class Courses constructor(var CourseName: String, var number_of_lectures: String,
+              var students: List<String>,var professor: String) {
+
+
+    fun numberOfStudents(): Int{
+
+        return students.size
+    }
+
+    fun assignProfessor(prof: Professors): Boolean{
+        prof.courses.forEach{
+            return it == CourseName
+        }
+
+        return false
+    }
+
+    fun professorName(): String{
+
+        return professor
+    }
+
+    fun enroll(student: Students): Boolean{
+        student.courses.forEach{
+            return it == CourseName
+        }
+
+        return false
+    }
+
+    fun courseInfo(): String{
+        return "\ncourse name: $CourseName\nNumber of lectures: $number_of_lectures\n" +
+                "Professor: $professor\nStudents: $students"
+    }
+
+}

src/main/kotlin/Main.kt

@@ -1,6 +1,88 @@
+import kotlin.random.Random
+
 fun main(args: Array<String>) {
 
-    // write your code here
+    // initialize the students, professors and courses
+
+    val professor = Professors("Mohammed","Ahmed", listOf("Algorithms"),"055555555")        // add professor
+    val student1 = Students("Ibrahim", "Alfaifi", listOf("Algorithms"))                             // add student
+    val course = Courses( "Algorithms", "12", listOf("Ibrahim Alfaifi","Ahmed Alfaifi"), "Mohammed Ahmed")  // add professor
+    val student2 = Students("Ahmed", "Alfaifi", listOf("Data Structure"))          // add another student
+
+
+
+
+
+//---------------------------------------------------------------------------------//
+                                            // using the course class //
+
+    //check if this course has a teacher
+    if (!course.assignProfessor(professor)){
+        println("This professor is not teacher to this course")
+        course.professor = professor.fullName()
+    }else{
+        println("This course has already a professor")
+    }
+
+
+
+    //check if this student has enrolled in this course
+    if (!course.enroll(student1)){
+        println("This student has not enrolled in this course")
+        course.students = listOf(student1.fullName())
+    }else{
+        println("This student has already enrolled in this course")
+    }
+
+
+
+
+    //check if this student has enrolled in this course
+    if (!course.enroll(student2)){
+        println("This student has not enrolled in this course")
+        course.students = listOf(student2.fullName())
+    }else{
+        println("This student has already enrolled in this course")
+    }
+
+
+
+
+    // print the number of students in a course
+    println("Number of students in this course: ${course.numberOfStudents()}")
+
+    // print the professor name for a course
+    println("the professor for this course: ${course.professorName()}")
+
+    // print the course info
+    println("the course information: ${course.courseInfo()}")
+
+    println("-------------------------------------------------------------")
+
+
+
+
+//-----------------------------------------------------------------------------------//
+                         // using student class //
+
+
+    // print all students in this collage
+    println("All students in this collage:\n 1- ${student1.fullName()} \n 2- ${student2.fullName()}")
+
+    println("-------------------------------------------------------------")
+
+
+
+
+
+//-----------------------------------------------------------------------------------//
+                            // using professor class //
+
+
+    // print all professors in this collage
+    println("All professors in this collage:\n 1- ${professor.fullName()}")
+
+
 
 
 }

src/main/kotlin/Professors.kt

@@ -0,0 +1,10 @@
+class Professors (var firstName: String, var lastName: String,
+                  var courses: List<String>, var telephone: String){
+
+
+    fun fullName(): String{
+
+        return "$firstName $lastName"
+    }
+
+}

src/main/kotlin/Students.kt

@@ -0,0 +1,9 @@
+class Students(var firstName: String, var lastName: String, var courses: List<String>) {
+
+    fun fullName(): String{
+
+        return "$firstName $lastName"
+    }
+
+
+}