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java
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import java.util.Scanner;
public class Main {
static Scanner scan = new Scanner(System.in);
public static void main(String[] args) {
/*
System.out.println("Enter the size of array: ");
int size = scan.nextInt();
int [] arr = new int[size];
System.out.println("Enter the numbers: ");
for(int i =0; i<arr.length; i++){
arr[i] = scan.nextInt();
}
int [] insertarray = new int[size +1];
System.out.println("Enter the position to insert the number: ");
int position = scan.nextInt();
System.out.println("Enter the number you like: ");
int number = scan.nextInt();
for (int i = 0; i<arr.length+1; i++){
if(i < position){
insertarray[i] = arr[i];
}
else if (i == position){
insertarray [i] = number;
}
else{
insertarray[i] = arr[i-1];
}
}
for (int i =0; i<arr.length+1;i++){
System.out.println(insertarray[i]);
}
//int [] deletearray = new int[size+1];
int [] deletearray = insertarray;
System.out.println("Enter the position index where you want to remove the number: ");
position = scan.nextInt();
for(int i =0; i<insertarray.length; i++){
if(i < position){
deletearray[i] = insertarray[i];
}
else if (i == position){
continue;
}
else {
deletearray[i-1]= insertarray[i];
}
}
for(int i = 0; i<insertarray.length-1; i++){
System.out.println(deletearray[i]);
}
*/
/*
System.out.println("Enter the size of array: ");
int size = scan.nextInt();
int [] arr = new int[size];
System.out.println("Enter the numbers: ");
for(int i =0; i<arr.length; i++){
arr[i] = scan.nextInt();
}
int pos =0, num= 0;
arr = insert(arr, pos, num);
display(arr);
arr = remove(arr, pos);
display(arr);
}
////////////// insert method array ////////////////////////////////////
public static int[] insert(int [] arr, int position, int number ){
System.out.println("In which position you want to enter the number: ");
position = scan.nextInt();
System.out.println("Which number you want to enter: ");
number = scan.nextInt();
int [] newarray = new int[arr.length+1];
for(int i=0; i<newarray.length;i++){
if(i<position){
newarray[i] = arr[i];
}
else if (i == position){
newarray[position] = number;
}
else {
newarray[i] = arr[i-1];
}
}
return newarray;
}
//// remove method array //////////////////////////////////////////////////////
public static int [] remove(int[] arr, int position){
System.out.println("Enter the position in order to remove the number: ");
position = scan.nextInt();
int [] deletearray = new int[arr.length-1];
for(int i =0,j=0; i<arr.length; i++){
if(i==position){
continue;
}
else {
deletearray[j++] = arr[i];
}
}
return deletearray;
}
//////////display array method ////////////////////////////
public static void display(int [] arr){
for(int i =0; i<arr.length; i++){
System.out.println(arr[i]);
}
*/
CourseCSC225 csc225 = new CourseCSC225("Data Structure");
csc225.addStudent("alma",89);
csc225.addStudent("john",98);
csc225.addStudent("baez",77);
csc225.addStudent("michael",88);
/// csc225.addStudent("james", 87);
String students1[] = csc225.getStudents();
for(int i = 0; i<students1.length; i++){
System.out.println("index is: " + (i)+ " --- > " + students1[i]);
}
///// insert or add more students ./////////
System.out.println("Enter the name of student: ");
String student = scan.next();
System.out.println("Enter the student grade: ");
int grade1 = scan.nextInt();
//System.out.println("Enter the student grade: ");
//double grade1 = scan.nextDouble();
csc225.addStudent(student,grade1);
students1 = csc225.getStudents();
for(int i =0; i<students1.length; i++){
System.out.println("index is: " + (i)+ " --- > " + students1[i]);
}
/// remove student from the course///////
System.out.println("Enter the name of student to remove: ");
student = scan.next();
csc225.dropStudent(student);
students1=csc225.getStudents();
for(int i =0; i<students1.length; i++){
System.out.println("index is: " + (i)+ " --- > " + students1[i]);
}
System.out.println("Enter the name of student to remove: ");
student = scan.next();
csc225.dropStudent(student);
students1=csc225.getStudents();
for(int i =0; i<students1.length; i++){
System.out.println("index is: " + (i)+ " --- > " + students1[i]);
}
//////////// insert by position //////////////////////////
System.out.println("Enter the postion of index to add the student: ");
int position = scan.nextInt();
System.out.println("Enter the name of student: ");
String insertname = scan.next();
String arr[] = new String[students1.length+1];
for (int i =0; i< arr.length;i++){
if(i < position){
arr[i]= students1[i];
}
else if (i == position){
arr[position] = insertname;
}
else{
arr[i] = students1[i-1];
}
}
System.out.println("----------------------\n");
for(int i =0; i<arr.length; i++){
System.out.println("index is: " + (i)+ " --- > " + arr[i]);
}
///////////////remove student by index //////////////////////
System.out.println("From which position you want to remove the student: ");
int index = scan.nextInt();
String [] removearray = new String[arr.length-1];
for(int i =0, j=0; i<removearray.length;i++,j++){
if (i == index){
j++;
}
removearray[i]=arr[j];
}
System.out.println("--------------------------\n");
for(int i =0; i<removearray.length;i++){
System.out.println("index is: " + (i)+ " --- > " + removearray[i]);
}
///////////////////////////////////////////////////////////////////////////
insertArray(csc225);
display(csc225);
}
public static void insertArray(CourseCSC225 asd){
Scanner scan = new Scanner(System.in);
System.out.println("Enter student name: ");
String name = scan.next();
System.out.println("Enter student grade1: ");
int grade1 = scan.nextInt();
asd.addStudent(name, grade1);
}
public static void display(CourseCSC225 asd){
for(int i =0; i<asd.getStudents().length; i++){
System.out.printf("%2d %7s %7d\n",i,asd.getStudents()[i], asd.getScore1()[i]);
}
}
}
//// end of main class //////////////////////////
//////////// suggestion how to include class instead of using all parameters one by one///////////
class Coursecsc22501{
String name;
int score1;
int score2;
// do the getters for each variable, too
}
/////////////////////////////////////////////////////////////////////////////////////////////
class CourseCSC225{
private String courseName;
private String [] students = new String[1];
private int [] score1 = new int[1];
private int numberOfStudents;
public CourseCSC225(String courseName){
this.courseName = courseName;
}
public String[] getStudents(){
return students;
}
public int[] getScore1(){
return score1;
}
public int getNumberOfStudents(){
return numberOfStudents;
}
public String getCourseName(){
return courseName;
}
///////////////// add students method ///////////////////
public void add(Coursecsc22501 student){
}
public void addStudent(String student, int grade1){
String [] a = new String[students.length+1];
int [] tempScore1 = new int[score1.length+1];
if(numberOfStudents == students.length){
for (int i = 0; i<numberOfStudents; i++){
a[i] = students[i];
tempScore1[i] = score1[i];
}
students = a;
score1 = tempScore1;
}
students[numberOfStudents] = student;
score1[numberOfStudents]= grade1;
numberOfStudents++;
}
/////////////////////////////////////
public void dropStudent(String student){
int position = findStudent(student);
if(position >=0){
dropStudent(position);
}
else{
System.out.println("The student doesnt exists in this course.. try again");
}
}
private void dropStudent(int position){
String [] s = new String[students.length -1];
int [] removestudent = new int[score1.length-1];
for(int i =0, j=0; i<s.length; i++,j++){
if(i == position){
j++;
}
s[i]=students[j];
removestudent[i] = score1[j];
}
this.students=s;
this.score1 = removestudent;
numberOfStudents--;
}
//////////
/////////
private int findStudent(String student){
for(int i =0; i<numberOfStudents; i++){
if(students[i].equals(student)){
return i;
}
}
return -1;
}
}
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