a) The use of computers in education is referred to as computer-assisted instruc

Question

a) The use of computers in education is referred to as computer-assisted instruction (CAI). Write a program that will help an elementary school student learn multiplication. Use the rand function to produce two positive one-digit integers. The program should then prompt the user with a question, such as How much is 6 times 7? The student then inputs the answer. Next, the program checks the student’s answer. If it’s correct, display the message "Very good!" and ask another multiplication question. If the answer is wrong, display the message "No. Please try again." and let the student try the same question repeatedly until the student finally gets it right. A separate function should be used to generate each new question. This function should be called once when the application begins execution and each time the user answers the question correctly. b) (Computer-Assisted Instruction: Reducing Student Fatigue) One problem in CAI environments is student fatigue. This can be reduced by varying the computer’s responses to hold the student’s attention. Modify the program of "part a" so that various comments are displayed for each answer as follows: Possible responses to a correct answer: Very good! Excellent! Nice work! Keep up the good work! Possible responses to an incorrect answer: No. Please try again. Wrong. Try once more. Don't give up! No. Keep trying. Use random-number generation to choose a number from 1 to 4 that will be used to select one of the four appropriate responses to each correct or incorrect answer. Use a switch statement to issue the responses. Use two functions: one for responses to a correct answer and another for responses to an incorrect answer. c) (Computer-Assisted Instruction: Monitoring Student Performance) More sophisticated computer-assisted instruction systems monitor the student’s performance over a period of time. The decision to begin a new topic is often based on the student’s success with previous topics. Modify the program of "part b" to count the number of correct and incorrect responses typed by the student. After the student types 10 answers, your program should use a function to calculate the percentage that are correct. If the percentage is lower than 75%, display "Please ask your teacher for extra help.", then reset the program so another student can try it. If the percentage is 75% or higher, display "Congratulations, you are ready to go to the next level!", then reset the program so another student can try it. d) (Computer-Assisted Instruction: Difficulty Levels) "part c" developed a computerassisted instruction program to help teach an elementary school student multiplication. Modify the function you create in "part a" to allow the user to enter a difficulty level. At a difficulty level of 1, the program should use only single-digit numbers in the problems; at a difficulty level of 2, numbers as large as two digits, and so on. e) (Computer-Assisted Instruction: Varying the Types of Problems) Modify the program of "part d" to allow the user to pick a type of arithmetic problem to study. An option of 1 means addition problems only, 2 means subtraction problems only, 3 means multiplication problems only, 4 means division problems only and 5 means a random mixture of all these types.

Explanation / Answer

// part a ***************************************************************

import java.util.*;
class Laba{
static Scanner sc=new Scanner(System.in);
public static void main(String[] args) {
System.out.println("Computer assisted instructon");
   while(true){
   Random rm=new Random();
   int n1=rm.nextInt(10);
   int n2=rm.nextInt(10);
Random rnum = new Random();
   mult(n1, n2);
}
}
    // multiplication
   static void mult(int n1, int n2){
   System.out.println("Learn multiplication");
  
   int multi=n1*n2;
   while(true){
   System.out.println("How much "+n1+" times "+n2+"?");
   int n3=sc.nextInt();
   if(n3==multi){
   System.out.println("Very Good");
   break;
   }
   else{
   System.out.println("No, Please try again");
   }
}
}
//multiplication end
   }

// part b ****************************************************************

import java.util.*;
class Labb{
static Scanner sc=new Scanner(System.in);
static Random rm=new Random();
public static void main(String[] args) {
System.out.println("Computer assisted instructon");
   while(true){
   int n1=rm.nextInt(10);
   int n2=rm.nextInt(10);
Random rnum = new Random();
   mult(n1, n2);
}
}
    // multiplication
   static void mult(int n1, int n2){
   System.out.println("Reducing Student Fatique");
  
   int multi=n1*n2;
   while(true){
   System.out.println("How much "+n1+" times "+n2+"?");
   int n3=sc.nextInt();
   if(n3==multi){
   correct();
   break;
   }
   else{
   incorrect();
  
   }
}
}
//multiplication end
   static void correct(){
   int c1=rm.nextInt(4);
   switch(c1){
   case 0: System.out.println("Very Good !");
   break;
   case 1: System.out.println("Excellent !");
   break;
   case 2: System.out.println("Nice Work !");
   break;
   case 3: System.out.println("Keep up the good work !");
   break;
}
}
   static void incorrect(){
   int c2=rm.nextInt(4);
   switch(c2){
   case 0: System.out.println("No, please try again !");
   break;
   case 1: System.out.println("wrong, try once more !");
   break;
   case 2: System.out.println("Don't give up !");
   break;
   case 3: System.out.println("No, keep trying!");
   break;
}

}  

}

// part c ****************************************************************************************

import java.util.*;
class Labc{
static Scanner sc=new Scanner(System.in);
static Random rm=new Random();
static int count=0, cor=0, incor=0;
public static void main(String[] args) {
System.out.println("Computer assisted instructon");
   while(count< 10){
   count++;
   int n1=rm.nextInt(10);
   int n2=rm.nextInt(10);
Random rnum = new Random();
   mult(n1, n2);
}
   percen();
}
    // multiplication
   static void mult(int n1, int n2){
   System.out.println("Monitor Student Performance");
   int multi=n1*n2;
   while(true){
   System.out.println("How much "+n1+" times "+n2+"?");
   int n3=sc.nextInt();
   if(n3==multi){
   cor++;
   correct();
   break;
   }
   else{
   incor++;
   incorrect();
   break;
   }
}
}
//multiplication end
   static void correct(){
   int c1=rm.nextInt(4);
   switch(c1){
   case 0: System.out.println("Very Good !");
   break;
   case 1: System.out.println("Excellent !");
   break;
   case 2: System.out.println("Nice Work !");
   break;
   case 3: System.out.println("Keep up the good work !");
   break;
}
}
   static void incorrect(){
   int c2=rm.nextInt(4);
   switch(c2){
   case 0: System.out.println("No, please try again !");
   break;
   case 1: System.out.println("wrong, try once more !");
   break;
   case 2: System.out.println("Don't give up !");
   break;
   case 3: System.out.println("No, keep trying!");
   break;
}

}
   static void percen(){
   if(cor>= 7.5){
    System.out.println("Congratulation");
}
   else {
   System.out.println("Please ask your teacher for extra help");
}
}  

}

// part d *****************************************************************************************

import java.util.*;
class Labd{
static Scanner sc=new Scanner(System.in);
static Random rm=new Random();
static int count=0, cor=0, incor=0;
public static void main(String[] args) {
System.out.println("Difficulty level");
   System.out.println("Enter Level number ");
   int lb=sc.nextInt();
   switch(lb){
   case 1:while(count< 10){
   count++;
   int n1=rm.nextInt(10);
   int n2=rm.nextInt(10);
Random rnum = new Random();
   mult(n1, n2);
}
   percen();
   break;
   case 2:while(count< 10){
   count++;
   int n1=rm.nextInt(100);
   int n2=rm.nextInt(100);
Random rnum = new Random();
   mult(n1, n2);
}
   percen();
   break;
}
}
    // multiplication
   static void mult(int n1, int n2){
   System.out.println("Monitor Student Performance");
   int multi=n1*n2;
   while(true){
   System.out.println("How much "+n1+" times "+n2+"?");
   int n3=sc.nextInt();
   if(n3==multi){
   cor++;
   correct();
   break;
   }
   else{
   incor++;
   incorrect();
   break;
   }
}
}
//multiplication end
   static void correct(){
   int c1=rm.nextInt(4);
   switch(c1){
   case 0: System.out.println("Very Good !");
   break;
   case 1: System.out.println("Excellent !");
   break;
   case 2: System.out.println("Nice Work !");
   break;
   case 3: System.out.println("Keep up the good work !");
   break;
}
}
   static void incorrect(){
   int c2=rm.nextInt(4);
   switch(c2){
   case 0: System.out.println("No, please try again !");
   break;
   case 1: System.out.println("wrong, try once more !");
   break;
   case 2: System.out.println("Don't give up !");
   break;
   case 3: System.out.println("No, keep trying!");
   break;
}

}
   static void percen(){
   if(cor>= 7.5){
    System.out.println("Congratulation");
}
   else {
   System.out.println("Please ask your teacher for extra help");
}
}  

}

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