modify Exercise 6.57 in  a way that every time the user give the right answer , the response varies within the following : Possible responses to a correct answer: Very good! Excellent! Nice work! Keep up the good work! while if the user give the incorrect answer the response varies within the following : 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. here is the code that need to be modified : and make sure you add line comments for each new line of code    EXERCISE 6.57 CODE: ----------------------------- //Name: IhabAtouf //Date:02/23/2023 // exercise 6.57 on page 281 //program description: create computer-assisted instruction (CAI) program that help students master thier math skills in multiplications, // multiplication involving two numbers each is a single digit positive, with encouraging message for succedding and another for failing to answer  // using random fucntion (rand) to generate a random number every time  #include// to be able to use input output stream #include//h is a header file in the standard library of the C programming language designed for basic mathematical operations #include//Converts a string into a long integer, also carry the library for definition of memory allocation and random processe #include//converts the given time since epoch to a calendar local time and then to a character representation. using namespace std;//using the standard library  int answer;//global varibale that can be used by any function in this code void questionGenerator() {//the function that generates the multiplication question      srand(time(NULL));// using the random function that changes every time per second      //here is the initial variable as zero by default      int initial = 0;     // here is two vraibales number1 and number2 that are required to multiply two numbers      int number1;     int number2;     number1 = (initial + (rand()) % 10);//the value of number1 using the follwing math : zero + any random number that has remainder of 10 using the remainder modulus     number2 = (initial + (rand()) % 10);//the value of number2 using the follwing math : zero + any random number that has remainder of 10 using the remainder modulus     answer = number1 * number2;// the asnwer variable that equals  the multiplication of those two numbers (number1 and 2)     cout << "How much is  " << number1 << " times " << number2 << " ?" << endl;//print how much is number 1 multiplied by number 2 ? } int main() {// the main function      int studentResponse = 1;// declaring local variable called student response      questionGenerator();// calling the question generator function      while (studentResponse != -1) {// as long as the student response not equal to -1 then:         cout << "Enter the correct answer" << endl;// print enter the correct answer statement          cin >> studentResponse;// allow user to input the student response variables value          if (answer == studentResponse) {//if the studenrt response entered by user equal the answer variable of multiplying those two numbers1 and number2 variables              cout << "Very Good!" << endl;// then print very good statement              questionGenerator();// then recall the function again for the net set of random numebrs multiplication              continue;// continue till user enter incorrect answer         }         else {// otherwise when answer not correct then print please try again statement              cout << "Please try again!" << endl;             while (studentResponse != answer) {// while loop if student response not equal to the correct answer then:                 cout << "Enter the correct answer" << endl;//print message enter correct answer                 cin >> studentResponse;//allow user to reneter hoping to get the correct answer, this will keep repeats as long as the student answer and the corredct answer doesnt match                 if (answer == studentResponse) {// if the answer match with student answer then:                     cout << "Very Good!" << endl;// then print very good statement                      questionGenerator();// then recall the function again for the net set of random numebrs multiplication question                      continue;// continue till user input incorrect answer                                                   }             }         }              }     return 0; } ------------------------------ END OF CODE