The following code contains four errors. I am having trouble with determining th
ID: 3882478 • Letter: T
Question
The following code contains four errors. I am having trouble with determining the error consisting of "choicce = getChoice(courses, input);". The complete code follows:
package 2dconsoleregisterforcourse;
import java.util.Scanner;
public class 2DConsoleRegisterForCourse {
public static void main(String[] args) {
// TODO code application logic here
System.out.println("Teacher's Copy");
Scanner input = new Scanner(System.in);
// courses 2d array hold course code and their credit hours
String[][] courses = {
{"IT1006", "IT4782", "IT4789", "IT4079", "IT2230", "IT3345", "IT2249"},
{"6", "3", "3", "6", "3", "3", "6"}
};
// validChoices 2d array holds valid number choices (as strings) selected by user
// and their corresponding courses
//e.g String[][] choices = { {"5", "IT2230"}, {"1", "IT1006"}, {"6", "IT3345"} };
String[][] validChoices = {
{"", ""},
{"", ""},
{"", ""}
};
int choice;
int totalCredit = 0;
String yesOrNo = "";
do {
choice = getChoice(courses, input);
switch (ValidateChoice(choice, validChoices, totalCredit, courses)) {
case -1:
System.out.println("**Invalid** - Your selection of " +
choice + " is not a recognized course.");
break;
case -2:
System.out.println("**Invalid** - You have already registerd for this " +
courses[0][choice-1] + " course.");
break;
case -3:
System.out.println("**Invalid** - You can not register for more than 9 credit hours.");
break;
case 0:
System.out.println("Registration Confirmed for course " +
courses[0][choice-1] );
totalCredit += Integer.parseInt(courses[1][choice-1]);
if (validChoices[0][0].equals("")) {
validChoices[0][0] = Integer.toString(choice);
validChoices[0] = courses[0][choice-1];
} else if (validChoices[1][0].equals("")) {
validChoices[1][0] = Integer.toString(choice);
validChoices[1][1] = courses[0][choice-1];
} else if (validChoices[2][0].equals("")) {
validChoices[2][0] = Integer.toString(choice);
validChoices[2][1] = courses[0][choice-1];
}
break;
}
WriteCurrentRegistration(validChoices, totalCredit);
System.out.print(" Do you want to try again? (Y|N)? : ");
yesOrNo = input.next().toUpperCase();
} while (yesOrNo.equals("Y"));
System.out.println("Thank you for registering with us");
}
//This method prints out the selection menu to the user in the form of
//[selection number]Course Code (Course Credit Hours)
//from the courses array one per line
//and then prompts the use to make a number selection
public static int getChoice(String[] courses, Scanner input) {
System.out.println("Please type the number inside the [] to register for a course");
System.out.println("The number inside the () is the credit hours for the course");
for(int i = 0; i < courses[0].length; i++ )
System.out.println("[" + (i+1) + "]" + courses[0][i] + "(" + courses[1][i] + ")");
System.out.print("Enter your choice : ");
return (input.nextInt());
}
//This method validates the user menu selection
//against the given registration business rules
//it returns the following code based on the validation result
// -1 = invalid, unrecognized menu selection
// -2 = invalid, alredy registered for the course
// -3 = invalid, No more than 9 credit hours allowed
// 0 = menu selection is valid
public static int ValidateChoice(int choice, String[][] validChoices, int totalCredit, String[][] courses) {
String choiceAsString = Integer.toString(choice);
if (choice < 1 || choice > 7)
return -1;
else if (choiceAsString.equals(validChoices[0][0])
|| choiceAsString.equals(validChoices[])
|| choiceAsString.equals(validChoices[2][0]))
return -2;
else if ( totalCredit + Integer.parseInt(courses[1][choice-1]) > 9)
return -3;
return 0;
}
//This method prints the current list of registered courses thus far
//from the courses array separated by , and enclosed inside { }
//It also prints the total credit registered for thus far
public static void WriteCurrentRegistration(String[][] validChoices, int totalCredit) {
if (validChoices[0][0].equals(""))
System.out.println("Current course registration: { none } " );
else if (validChoices[1][0].equals(""))
System.out.println("Current course registration: { " + validChoices[0][i] + " }" );
else if (validChoices[2][0].equals(""))
System.out.println("Current course registration: { " + validChoices[0][1] +
", " + validChoices[1][1] + " }");
else
System.out.println("Current course registration: { " + validChoices[0][1] +
", " + validChoices[1][1] + ", " + validChoices[2][1] + " }");
System.out.println("Current registration total credit = " + totalCredit);
}
}
Explanation / Answer
Hi,
I have fixed all compilation errors and it is error free now.
TwoDConsoleRegisterForCourse.java
import java.util.Scanner;
public class TwoDConsoleRegisterForCourse {
public static void main(String[] args) {
System.out.println("Teacher's Copy");
Scanner input = new Scanner(System.in);
// courses 2d array hold course code and their credit hours
String[][] courses = {
{"IT1006", "IT4782", "IT4789", "IT4079", "IT2230", "IT3345", "IT2249"},
{"6", "3", "3", "6", "3", "3", "6"}
};
// validChoices 2d array holds valid number choices (as strings) selected by user
// and their corresponding courses
//e.g String[][] choices = { {"5", "IT2230"}, {"1", "IT1006"}, {"6", "IT3345"} };
String[][] validChoices = {
{"", ""},
{"", ""},
{"", ""}
};
int choice;
int totalCredit = 0;
String yesOrNo = "";
do {
choice = getChoice(courses, input);
switch (ValidateChoice(choice, validChoices, totalCredit, courses)) {
case -1:
System.out.println("**Invalid** - Your selection of " +
choice + " is not a recognized course.");
break;
case -2:
System.out.println("**Invalid** - You have already registerd for this " +
courses[0][choice-1] + " course.");
break;
case -3:
System.out.println("**Invalid** - You can not register for more than 9 credit hours.");
break;
case 0:
System.out.println("Registration Confirmed for course " +
courses[0][choice-1] );
totalCredit += Integer.parseInt(courses[1][choice-1]);
if (validChoices[0][0].equals("")) {
validChoices[0][0] = Integer.toString(choice);
validChoices[0][1] = courses[0][choice-1];
} else if (validChoices[1][0].equals("")) {
validChoices[1][0] = Integer.toString(choice);
validChoices[1][1] = courses[0][choice-1];
} else if (validChoices[2][0].equals("")) {
validChoices[2][0] = Integer.toString(choice);
validChoices[2][1] = courses[0][choice-1];
}
break;
}
WriteCurrentRegistration(validChoices, totalCredit);
System.out.print(" Do you want to try again? (Y|N)? : ");
yesOrNo = input.next().toUpperCase();
} while (yesOrNo.equals("Y"));
System.out.println("Thank you for registering with us");
}
//This method prints out the selection menu to the user in the form of
//[selection number]Course Code (Course Credit Hours)
//from the courses array one per line
//and then prompts the use to make a number selection
public static int getChoice(String[][] courses, Scanner input) {
System.out.println("Please type the number inside the [] to register for a course");
System.out.println("The number inside the () is the credit hours for the course");
for(int i = 0; i < courses.length; i++ )
System.out.println("[" + (i+1) + "]" + courses[0][i] + "(" + courses[1][i] + ")");
System.out.print("Enter your choice : ");
return (input.nextInt());
}
//This method validates the user menu selection
//against the given registration business rules
//it returns the following code based on the validation result
// -1 = invalid, unrecognized menu selection
// -2 = invalid, alredy registered for the course
// -3 = invalid, No more than 9 credit hours allowed
// 0 = menu selection is valid
public static int ValidateChoice(int choice, String[][] validChoices, int totalCredit, String[][] courses) {
String choiceAsString = Integer.toString(choice);
if (choice < 1 || choice > 7)
return -1;
else if (choiceAsString.equals(validChoices[0][0])
|| choiceAsString.equals(validChoices[0][1])
|| choiceAsString.equals(validChoices[2][0]))
return -2;
else if ( totalCredit + Integer.parseInt(courses[1][choice-1]) > 9)
return -3;
return 0;
}
//This method prints the current list of registered courses thus far
//from the courses array separated by , and enclosed inside { }
//It also prints the total credit registered for thus far
public static void WriteCurrentRegistration(String[][] validChoices, int totalCredit) {
if (validChoices[0][0].equals(""))
System.out.println("Current course registration: { none } " );
else if (validChoices[1][0].equals(""))
System.out.println("Current course registration: { " + validChoices[1][0] + " }" );
else if (validChoices[2][0].equals(""))
System.out.println("Current course registration: { " + validChoices[0][1] +
", " + validChoices[1][1] + " }");
else
System.out.println("Current course registration: { " + validChoices[0][1] +
", " + validChoices[1][1] + ", " + validChoices[2][1] + " }");
System.out.println("Current registration total credit = " + totalCredit);
}
}
Output:
Teacher's Copy
Please type the number inside the [] to register for a course
The number inside the () is the credit hours for the course
[1]IT1006(6)
[2]IT4782(3)
Enter your choice : 1
Registration Confirmed for course IT1006
Current course registration: { }
Current registration total credit = 6
Do you want to try again? (Y|N)? : y
Please type the number inside the [] to register for a course
The number inside the () is the credit hours for the course
[1]IT1006(6)
[2]IT4782(3)
Enter your choice : 2
Registration Confirmed for course IT4782
Current course registration: { IT1006, IT4782 }
Current registration total credit = 9
Do you want to try again? (Y|N)? : n
Thank you for registering with us
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