Design a java program that asks for the number of students registered in a cours

Question

Design a java program that asks for the number of students registered in a course. The user should be prompted to enter the number of students enrolled in a course. If the number of students is greater than 0, use a counter-controlled while loop to prompt the user to enter the names of the students registered for the class. Create an output file that contains the names of the students in the class. Display a message to the user when the program is complete.

Write a java program based on the design you created above. Enter your program and name it Roster1.java. Name your output file student1.dat.

Step through your code by hand and complete a memory chart showing what occurs in memory when java code is executed.

To fill out the memory chart for each variable, specify the name of the variable, its data type, the line number in which the variable is assigned its initial value, the initial value assigned to the variable, and the line numbers in which the vairiable's value changes.

Execute your program. Then copy the output and save it in a block comment at the end of your program

Explanation / Answer

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.util.Scanner;

public class Roster1 {

public static void main(String[] args) throws IOException{

Scanner in = new Scanner(System.in);

System.out.print("Enter the no of students enrolled: ");

int num = in.nextInt();

PrintWriter writer = new PrintWriter(new File("student1.dat"));

if(num>0){

int count=1;

while(count<=num){

System.out.print("Enter the name of student "+count+": ");

String name = in.next();

writer.println(name);

writer.flush();

count++;

}

System.out.println("You entered details of all the students.");

System.out.println("Your ouput file is created 'student1.dat'");

}

//closing the streams

writer.close();

in.close();

}

}

/**********************Output Screen*******************************

Enter the no of students enrolled: 6

Enter the name of student 1: John

Enter the name of student 2: Rick

Enter the name of student 3: Matt

Enter the name of student 4: Paul

Enter the name of student 5: Larry

Enter the name of student 6: Sam

You entered details of all the students.

Your ouput file is created 'student1.dat'

**********************************************************************/

/*******************Output File****************

John

Rick

Matt

Paul

Larry

Sam

**************************************/

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