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Coursework.java
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Coursework.java
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import java.util.*;
class Coursework{
static String[] sID=new String[0];
static String[] sName=new String[0];
static int[] prfmarks=new int[0];
static int[] dbmmarks=new int[0];
static int[] studentTot;
static double[] studentAvg;
static int[] studentRank;
static String sid="";
public static int checkSId(final int opt){ //to get index num [1] | to check sid in array [2]
Scanner input=new Scanner(System.in);
L1:while(true){
System.out.print("\nEnter student ID : ");
sid=input.next();
int i=search(sID,sid);
while(opt==1){
if(i==-1){
System.out.print("Invalid Student ID.");
while(true){
System.out.print("Do you want to search again? (Y/n) : ");
String ans=input.next();
if(ans.equals("y") || ans.equals("Y")){
continue L1;
}else if(ans.equals("n") || ans.equals("N")){
return -1;
}else{
System.out.println("Invalid Option");
continue;
}
}
}
return i;
}
while(opt==2){
char ch=sid.charAt(0);
if(ch!='S' || sid.length()!=4){
System.out.println("The student ID Invalid! Try again\n");
continue L1;
}
if(checkDuplicate(sID,Coursework.sid)){
System.out.println("The student ID already exists\n");
continue L1;
}
return -1;
}
}
}
public static void printTitle(String t){
int len=78,x,y;
x=(len-t.length())/2;
if(t.length()%2==1){
y=x+1;
}else{
y=x;
}
System.out.println("+------------------------------------------------------------------------------+");
System.out.printf("|%"+x+"s%s%"+y+"s|\n","",t,"");
System.out.println("+------------------------------------------------------------------------------+\n\n");
}
public final static void clearConsole() {
try {
final String os = System.getProperty("os.name");
if (os.contains("Windows")) {
new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();
} else {
System.out.print("\033[H\033[2J");
System.out.flush();
}
} catch (final Exception e) {
e.printStackTrace();
// Handle any exceptions.
}
}
public static String[] addIndex(String[] a){
String[] temp=new String[a.length+1];
for (int i = 0; i < a.length ; i++){
temp[i]=a[i];
}
return temp;
}
public static int search(String[] a,String s){
for (int i = 0; i < a.length; i++){
if(a[i].equals(s)){
return i;
}
}
return -1;
}
public static int[] addIndex(int[] a){
int[] temp=new int[a.length+1];
for (int i = 0; i < a.length ; i++){
temp[i]=a[i];
}
return temp;
}
public static boolean checkDuplicate(String[] ar,String s){
for(String i:ar){
if(i.equals(s)){
return true;
}
}
return false;
}
public static void addStudent(){ //1.Add new student
Scanner input=new Scanner(System.in);
L1:do{
printTitle("ADD NEW STUDENT");
checkSId(2);
System.out.print("Enter student name : ");
String sname=input.next();
sID=addIndex(sID);
sName=addIndex(sName);
prfmarks=addIndex(prfmarks);
dbmmarks=addIndex(dbmmarks);
sID[sID.length-1]=sid;
sName[sName.length-1]=sname;
prfmarks[prfmarks.length-1]=-1;
dbmmarks[dbmmarks.length-1]=-1;
System.out.print("Student has been added successfully.");
L2:do{
System.out.print("Do you want to add a new student (Y/n): ");
String ans=input.next();
clearConsole();
if(ans.equals("y") || ans.equals("Y")){
continue L1;
}else if(ans.equals("n") || ans.equals("N")){
return;
}else{
System.out.println("Invalid Option...!");
continue L2;
}
}while(true);
}while(true);
}
public static void addStudentWithMarks(){ //2.Add new student with marks
Scanner input=new Scanner(System.in);
L1:do{
printTitle("ADD NEW STUDENT WITH MARKS");
checkSId(2);
System.out.print("Enter student name : ");
String sname=input.next();
System.out.println();
sID=addIndex(sID);
sName=addIndex(sName);
prfmarks=addIndex(prfmarks);
dbmmarks=addIndex(dbmmarks);
sID[sID.length-1]=sid;
sName[sName.length-1]=sname;
prfmarks[prfmarks.length-1]=addPrfMarks();
dbmmarks[dbmmarks.length-1]=addDbmMarks();
System.out.print("Student has been added successfully.");
while(true){
System.out.print("Do you want to add a new student (Y/n): ");
String ans=input.next();
clearConsole();
if(ans.equals("y") || ans.equals("Y")){
continue L1;
}else if(ans.equals("n") || ans.equals("N")){
return;
}else{
System.out.println("Invalid Option...!");
continue;
}
}
}while(true);
}
public static void addMarks(){ //3.Add marks
Scanner input=new Scanner(System.in);
L1:do{
printTitle("ADD MARKS");
int i=checkSId(1);
if(i==-1){
return;
}
System.out.println("Student Name : "+sName[i]);
if(prfmarks[i]!=-1){
System.out.println("This student's marks have been already added.\nIf you want to update the marks, please use [5] Update Marks option.\n");
}else{
System.out.println();
prfmarks[i]=addPrfMarks();
dbmmarks[i]=addDbmMarks();
System.out.print("Marks have been added. ");
}
while(true){
System.out.print("Do you want to add marks for another student? (Y/n) : ");
String ans=input.next();
clearConsole();
if(ans.equals("y") || ans.equals("Y")){
continue L1;
}else if(ans.equals("n") || ans.equals("N")){
return;
}else{
System.out.println("Invalid Option...!");
continue;
}
}
}while(true);
}
public static int addPrfMarks(){
Scanner input=new Scanner(System.in);
while(true){
System.out.print("Programming Fundamental Marks : ");
int prfm=input.nextInt();
if(prfm<0 || prfm>100){
System.out.println("Invalid marks, please enter correct marks.");
continue;
}
return prfm;
}
}
public static int addDbmMarks(){
Scanner input=new Scanner(System.in);
while(true){
System.out.print("Database Managenment System Marks : ");
int dbmm=input.nextInt();
if(dbmm<0 || dbmm>100){
System.out.println("Invalid marks, please enter correct marks.\n");
continue;
}
return dbmm;
}
}
public static void updateStudentDetail(){ //4.update student details
Scanner input=new Scanner(System.in);
L1:do{
printTitle("UPDATE STUDENT DETAILS");
int i=checkSId(1);
if(i==-1){
clearConsole();
return;
}
System.out.println("Student Name : "+sName[i]);
System.out.print("\nEnter the new student name: ");
String name=input.next();
sName[i]=name;
System.out.println("\nStudent details has been updated successfuly.");
while(true){
System.out.print("Do you want to update another student details? (Y/n): ");
String ans=input.next();
clearConsole();
if(ans.equals("y") || ans.equals("Y")){
continue L1;
}else if(ans.equals("n") || ans.equals("N")){
return;
}else{
System.out.println("Invalid Option...!");
continue;
}
}
}while(true);
}
public static void updateMarks(){ //5.update marks
Scanner input=new Scanner(System.in);
L1:do{
printTitle("UPDATE MARKS");
int i=checkSId(1);
if(i==-1){
return;
}
System.out.println("Student Name : "+sName[i]);
if(prfmarks[i]==-1){
System.out.println("\nThis student's marks yet to be added.");
}else{
System.out.println("\nProgramming Fundamentals Marks : "+prfmarks[i]);
System.out.println("Database Management System Marks : "+dbmmarks[i]);
System.out.print("\nEnter new ");
prfmarks[i]=addPrfMarks();
System.out.print("Enter new ");
dbmmarks[i]=addDbmMarks();
}
while(true){
System.out.print("Do you want to update marks for another student? (Y/n): ");
String ans=input.next();
clearConsole();
if(ans.equals("y") || ans.equals("Y")){
continue L1;
}else if(ans.equals("n") || ans.equals("N")){
return;
}else{
System.out.println("Invalid Option...!");
continue;
}
}
}while(true);
}
public static void deleteStudent(){ //6.delete student
Scanner input=new Scanner(System.in);
L1:do{
printTitle("DELETE STUDENT");
int i=checkSId(1);
if(i==-1){
clearConsole();
return;
}
sID=deleteIndex(sID,i);
sName=deleteIndex(sName,i);
prfmarks=deleteIndex(prfmarks,i);
dbmmarks=deleteIndex(dbmmarks,i);
System.out.println("Student has been deleted successfully.");
while(true){
System.out.print("Do you want to delete another student? (Y/n): ");
String ans=input.next();
clearConsole();
if(ans.equals("y") || ans.equals("Y")){
continue L1;
}else if(ans.equals("n") || ans.equals("N")){
return;
}else{
System.out.println("Invalid Option...!");
continue;
}
}
}while(true);
}
public static String[] deleteIndex(String[] s,int in){
String[] temp=new String[s.length-1];
for (int i = 0,j=0; j < temp.length; i++,j++){
if(i==in && in!=s.length-1){
i++;
}
temp[j]=s[i];
}
return temp;
}
public static int[] deleteIndex(int[] s,int in){
int[] temp=new int[s.length-1];
for (int i = 0,j=0; j < temp.length; i++,j++){
if(i==in && in!=s.length-1){
i++;
}
temp[j]=s[i];
}
return temp;
}
public static void findTotAvg(){
studentTot=new int[sID.length];
studentAvg=new double[sID.length];
for (int i = 0; i < sID.length; i++){
studentTot[i]=prfmarks[i]+dbmmarks[i];
studentAvg[i]=studentTot[i]/2d;
}
}
public static int[] findRank(int[] a){
int[] temp=new int[sID.length];
int[] rank=new int[sID.length];
for (int i = 0; i < sID.length; i++){
temp[i]=a[i];
rank[i]=i;
}
for (int i = sID.length-1; i > 0; i--){
for(int j=1; j<=i; j++){
if(temp[j-1]<temp[j]){
int t=temp[j-1];
int in=rank[j-1];
temp[j-1]=temp[j];
rank[j-1]=rank[j];
temp[j]=t;
rank[j]=in;
}
}
}
return rank;
}
public static int checkRank(int in){
int rank=-1;
for (int i = 0; i < sID.length; i++){
if(studentRank[i]==in){
rank=i+1;
break;
}
}
return rank;
}
public static String rankPlace(int rank){
String p="";
int count=0;
for(int i:studentTot){
count+=i==-2 ? 1 : 0;
}
rank+=rank==(sID.length-count) ? 100 : 0;
p=rank==1 ? "1 (First)"
:rank==2 ? "2 (Second)"
:rank==3 ? "3 (Third)"
:rank==4 ? "4 (Fourth)"
:rank==5 ? "5 (Fifth)"
:rank==6 ? "6 (Sixth)"
:rank==7 ? "7 (Seventh)"
:rank==8 ? "8 (Eighth)"
:rank==9 ? "9 (ninth)"
:rank==10 ? "10 (tenth)"
:rank==11 ? "11 (eleventh)"
:rank==12 ? "12 (twelth)"
:rank==13 ? "13 (Thirteenth)"
:rank==14 ? "14 (Fourteenth)"
:rank==15 ? "15 (Fifteenth)"
:rank==16 ? "16 (Sixteenth)"
:rank==17 ? "17 (Seventeenth)"
:rank==18 ? "18 (Eighteenth)"
:rank==19 ? "19 (Nineteenth)"
:rank==20 ? "20 (Twentieth)"
: rank-100+" (Last)";
return p;
}
public static void printStuDetail(){ //7.Print student details
Scanner input=new Scanner(System.in);
L1:do{
printTitle("PRINT STUDENT DETAILS");
int i=checkSId(1);
if(i==-1){
clearConsole();
return;
}
System.out.println("Student Name : "+sName[i]);
if(prfmarks[i]==-1){
System.out.println("\nMarks yet to be added!\n");
}else{
System.out.println("+-----------------------------------+--------------------+");
String row=String.format("|%-35s|%20d|","Programming Fundamentals Marks",prfmarks[i]);
System.out.println(row);
row=String.format("|%-35s|%20d|","Database Management System Marks",dbmmarks[i]);
System.out.println(row);
int tot=dbmmarks[i]+prfmarks[i];
row=String.format("|%-35s|%20d|","Total Marks",tot);
System.out.println(row);
double avg=tot/2d;
row=String.format("|%-35s|%20.2f|","Avg. Marks",avg);
System.out.println(row);
findTotAvg();
studentRank=findRank(studentTot);
row=String.format("|%-35s|%20s|","Rank",rankPlace(checkRank(i)));
System.out.println(row);
System.out.println("+-----------------------------------+--------------------+");
}
do{
System.out.print("Do you want to search another student? (Y/n): ");
String ans=input.next();
clearConsole();
if(ans.equals("y") || ans.equals("Y")){
continue L1;
}else if(ans.equals("n") || ans.equals("N")){
return;
}else{
System.out.println("Invalid Option...!");
continue;
}
}while(true);
}while(true);
}
public static void printStuRank(){ //8. Print student details rankes
Scanner input=new Scanner(System.in);
L1:do{
printTitle("PRINT STUDENT RANKS");
findTotAvg();
studentRank=findRank(studentTot);
System.out.println("+----+----+--------------------+-----------+-----------+");
String row=String.format("|%-4s|%-4s|%-20s|%11s|%11s|","Rank","ID","Name","Total Marks","Avg. Marks");
System.out.println(row);
System.out.println("+----+----+--------------------+-----------+-----------+");
for(int i:studentRank){
if(studentTot[i]==-2){
break;
}
row=String.format("|%-4s|%-4s|%-20s|%11d|%11.2f|",checkRank(i),sID[i],sName[i],studentTot[i],studentAvg[i]);
System.out.println(row);
}
System.out.println("+----+----+--------------------+-----------+-----------+");
do{
System.out.print("Do you want to go back to main menu?(Y/n): ");
String ans=input.next();
clearConsole();
if(ans.equals("n") || ans.equals("N")){
continue L1;
}else if(ans.equals("y") || ans.equals("Y")){
return;
}else{
System.out.println("Invalid Option...!");
continue;
}
}while(true);
}while(true);
}
public static void printBestInASub(int[] a,int[] b){ //9.Print best in subject
Scanner input=new Scanner(System.in);
L1:do{
String s1="PRF Marks",s2="DBM Marks",s3="";
if(a==dbmmarks){
s3=s1;
s1=s2;
s2=s3;
printTitle("BEST IN DATATBASE MANAGEMENT SYSTEM");
}else{
printTitle("BEST IN PROGRAMMING FUNDAMENTALS");
}
System.out.println("+----+--------------------+---------+---------+");
String row=String.format("|%-4s|%-20s|%9s|%9s|","ID","Name",s1,s2);
System.out.println(row);
System.out.println("+----+--------------------+---------+---------+");
findTotAvg();
int[] rank=findRank(a);
for(int i:rank){
if(studentTot[i]==-2){
break;
}
row=String.format("|%-4s|%-20s|%9d|%9d|",sID[i],sName[i],a[i],b[i]);
System.out.println(row);
}
System.out.println("+----+--------------------+---------+---------+");
do{
System.out.print("Do you want to go back to main menu?(Y/n): ");
String ans=input.next();
clearConsole();
if(ans.equals("n") || ans.equals("N")){
continue L1;
}else if(ans.equals("y") || ans.equals("Y")){
return;
}else{
System.out.println("Invalid Option...!");
continue;
}
}while(true);
}while(true);
}
public static void optionCall(int ans){
clearConsole();
if(ans==1){
addStudent();
}else if(ans==2){
addStudentWithMarks();
}else if(ans==3){
addMarks();
}else if(ans==4){
updateStudentDetail();
}else if(ans==5){
updateMarks();
}else if(ans==6){
deleteStudent();
}else if(ans==7){
printStuDetail();
}else if(ans==8){
printStuRank();
}else if(ans==9){
printBestInASub(prfmarks,dbmmarks);
}else if(ans==10){
printBestInASub(dbmmarks,prfmarks);
}else if(ans==-1){
return;
}else{
System.out.println("Wrong Answer! Enter Again..");
}
}
public static void homePage(){
printTitle("WELCOME TO GDSE MARKS MANAGEMENT SYSTEM");
String row=String.format("[1] %-36s[2] %-36s","Add New Student","Add New Studetn With Marks");
System.out.println(row);
row=String.format("[3] %-36s[4] %-36s","Add Marks","Update Student Details");
System.out.println(row);
row=String.format("[5] %-36s[6] %-36s","Update Marks","Delete Student");
System.out.println(row);
row=String.format("[7] %-36s[8] %-36s","Print Student Details","Print Student Ranks");
System.out.println(row);
row=String.format("[9] %-36s[10] %-36s","Best in Programming Fundamentals","Best in Database Management System\n");
System.out.println(row);
}
public static void main(String args[]){
Scanner input=new Scanner(System.in);
homePage();
System.out.print("Enter an option to continue > ");
int ans=input.nextInt();
while(ans!=-1){
optionCall(ans);
clearConsole();
homePage();
System.out.print("Enter an option to continue > ");
ans=input.nextInt();
}
}
}