What’s the answer to the question

[tex]What’s the answer to the question[/tex]

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What’s the answer to the question

[tex]What’s the answer to the question[/tex]

Here is the program that determines the number of questions that the student answered correctly.

#include <iostream> //to use input output functions

#include <fstream> // to handle files

#define size 20 //size of questions is fixed to 20

using namespace std; //to identify objects cin cout

int correctAnswers(char answers[], char correct[]); //to count correct answers given by student

int main(){ //start of main function

char correct[size]; // array stores correct answers

char answers[size]; //stores answers of students

int result; //stores the correct answers result of student

double percentage; //stores the percentage of correct answers

int counter; //counts number of correct answers given by student

ifstream reader("CorrectAnswers.txt"); //reads the contents of CorrectAnswers.txt file

if(!reader){ //if file cannot be read/opened

cout<<"Cannot open the file"<<endl; //displays error message

return 0; }

counter = 0; //sets counter to 0 initially

while( (reader>>correct[counter++]) && counter < size ); //reads each answer from CorrectAnswers.txt and stores it in char array correct[] at each iteration of while loop

reader.close(); //closes the file

reader.open("StudentAnswers.txt"); //opens StudentAnswers.txt file

if(!reader){ //if file could not be opened

cout<<"Cannot open file"<<endl; //displays this error message

return 0; }

counter = 0; //sets counter to 0

while( (reader>>answers[counter++]) && counter < size ); //reads each answer from StudentAnswers.txt and stores it in char array answers[] at each iteration of while loop

result = correctAnswers(answers,correct); //calls correctAnswers method to compute the correct answers given by student and stores the result of correct answers in result variable

percentage = 100.0*result/size; //computes percentage of correct answers of student

cout<<"The total number of questions answered correctly: "<<result<<endl; //displays total no of qs answered correctly

cout<<"The percentage of questions answered correctly: "<<percentage<<" %"<<endl; //displays computed percentage

if( percentage >= 75 ){ //if percentage of correctly answered questions is 75% or greater

cout<<"Student has passed the exam!"<<endl; } //displays that the student passed the exam

else { //if percentage of correctly answered questions is below 75%

cout<<"Student has failed the exam!"<<endl; } //displays that the student failed the exam

return 0; }

int correctAnswers(char answers[], char correct[]){ //method to compute the number of correct answers

int countCorrect = 0; //stores the count of correct answers

for(int i=0; i<size; i++){ //iterates 20 times to match answers from both the files of 20 questions

if( answers[i] == correct[i] ){ // if the student answer in StudentAnswers.txt file matches with the correct answer given in CorrectAnswers.txt file

countCorrect++; } } //adds 1 to the countCorrect every time the student answer matches with the correct answer

return countCorrect; } //returns the number of questions that the student answered correctly

Explanation:

The program is well explained in the comments mentioned with each line of code.

Here are the two files that can be used to check the working of the above program. You can create your own text files too.

CorrectAnswers.txt :

A

A

B

D

C

C

A

C

D

D

A

B

A

B

B

C

A

C

C

B

StudentAnswers.txt

A

C

B

D

C

C

B

C

D

C

D

B

A

B

B

C

A

C

C

B

Also if the number of wrong answers are to be displayed then add this method to the above code:

void wrongAnswers(char answers[], char correct[]){ //method takes two arrays one with correct answers and the other with student answers

for(int i=0; i<size; i++){ //iterates 20 times

if( answers[i] != correct[i] ){ //if the answer by student does not match with correct answer

cout<<"Question Number: "<<i+1<<endl; //the question that is answered incorrectly

cout<<"Correct answer is: "<<correct[i]<<endl; //displays the correct answer

cout<<"Student answer is: "<<answers[i]<<endl; } } } //displays the answer that student gave

Now call this method in main() as:

if(result < size){ //if result is less than size i.e. 20

cout<<"The questions answered incorrectly"<<endl; //number of questions that are answered incorrectly

wrongAnswers(answers,correct); //calls method to compute the wrongly answered questions

}else{ //if result is not less than size

cout<<"No incorrect answers."<<endl; } //no questions incorrectly answered

cout<<"Number of missed questions: "<<size-result<<endl; //displays the number of missed questions

The screenshot of the output is attached.

[tex]One of your professors has asked you to write a program to grade her midterm exams, which consist of[/tex]

[tex]One of your professors has asked you to write a program to grade her midterm exams, which consist of[/tex]

Slope = -2, y-intercept = 12 (b)

Step-by-step explanation:

Using the slope formula:

slope = change in y (y2-y1) / change in x (x2-x1)

slope = (12-18)/(0+3)

slope = -6/3

slope = -2

The slope is -2

If you look in the table, when x=0, the y value equals 12. This means that the y-intercept = 12, since the y-intercept is when the x equals 0. Thus we have our answer.