Question

Hello, I have written a code that I now need to make changes so that arrays are transferred to the functions as pointer variable. Below is my code I already have.

#include<iostream>
#include<string>
#include<iomanip>

using namespace std;

//functions prototypes
void getData(string id[], int correct[], int NUM_STUDENT);
void calculate(int correct[], int incorrect[], int score[], int NUM_STUDENT);
double average(int score[], int NUM_STUDENT);
void Display(string id[], int correct[], int incorrect[], int score[], double average, int NUM_STUDENT);
int findHigh(string id[], int score[], int NUM_STUDENT);
//declaring constants
const int NUM_STUDENT = 4;
const int NUM_Q = 50;
//main
int main()
{
   //array declaration
   int correct[NUM_STUDENT], incorrect[NUM_STUDENT], score[NUM_STUDENT];
   string id[NUM_STUDENT];

   //function calls
   getData(id, correct, NUM_STUDENT);
   calculate(correct, incorrect, score, NUM_STUDENT);

   double avg = average(score, NUM_STUDENT);

   Display(id, correct, incorrect, score, avg, NUM_STUDENT);

   int high = findHigh(id, score, NUM_STUDENT);
   cout << "Highest Test Score: " << high;
   cout << endl;

   system("pause");
   return 0;
}

//method getData
void getData(string id[], int correct[], int NUM_STUDENT)
{
   for (int i = 0; i < NUM_STUDENT; i++)
   {
       //reading user input
       cout << "Student's ID\t\t\t: ";
       cin >> id[i];
       cout << "Number of correct answers\t: ";
       cin >> correct[i];
       cout << endl;
   }
}

void calculate(int correct[], int incorrect[], int score[], int NUM_STUDENT)
{
   for (int i = 0; i < NUM_STUDENT; i++)
   {
       //calculating score
       incorrect[i] = NUM_Q - correct[i];
       score[i] = 2 * correct[i];
   }
}

double average(int score[], int NUM_STUDENT)
{
   double sum = 0.0;
   for (int i = 0; i < NUM_STUDENT; i++)
   {
       sum += score[i];
   }

   return sum / NUM_STUDENT;
}

void Display(string id[], int correct[], int incorrect[], int score[], double average, int NUM_STUDENT)
{
   system("cls");
   cout << "ID\t\tCorrect Answers\t\tIncorrect Answers\tScore\n\n";
   for (int i = 0; i < NUM_STUDENT; i++)
   {
       cout << id[i] << "\t\t\t" << correct[i] << "\t\t\t" << incorrect[i] << "\t\t " << score[i] << endl;
   }

   cout << "\n\nSummary:\n\n";
   cout << "Test Score Average: " << fixed << showpoint << setprecision(2) << average << endl;
}

int findHigh(string id[], int score[], int NUM_STUDENT)
{
   int max = score[0];
   for (int i = 1; i < NUM_STUDENT; i++)
   {
       if (max < score[i])
           max = score[i];
   }

   return max;
}

Answer 1

#include<iostream>
#include<string>
#include<iomanip>

using namespace std;

//functions prototypes
void getData(string *id, int *correct, int NUM_STUDENT);
void calculate(int *correct, int *incorrect, int *score, int NUM_STUDENT);
double average(int *score, int NUM_STUDENT);
void Display(string *id, int *correct, int *incorrect, int *score, double average, int NUM_STUDENT);
int findHigh(string *id, int *score, int NUM_STUDENT);
//declaring constants
const int NUM_STUDENT = 4;
const int NUM_Q = 50;
//main
int main()
{
   //array declaration
   int correct[NUM_STUDENT], incorrect[NUM_STUDENT], score[NUM_STUDENT];
   string id[NUM_STUDENT];

   //function calls
   getData(id, correct, NUM_STUDENT);
   calculate(correct, incorrect, score, NUM_STUDENT);

   double avg = average(score, NUM_STUDENT);

   Display(id, correct, incorrect, score, avg, NUM_STUDENT);

   int high = findHigh(id, score, NUM_STUDENT);
   cout << "Highest Test Score: " << high;
   cout << endl;

   system("pause");
   return 0;
}

//method getData
void getData(string *id, int *correct, int NUM_STUDENT)
{
   for (int i = 0; i < NUM_STUDENT; i++)
   {
       //reading user input
       cout << "Student's ID\t\t\t: ";
       cin >> *(id+i);
       cout << "Number of correct answers\t: ";
       cin >> *(correct+i);
       cout << endl;
   }
}

void calculate(int *correct, int *incorrect, int *score, int NUM_STUDENT)
{
   for (int i = 0; i < NUM_STUDENT; i++)
   {
       //calculating score
       *(incorrect+i) = NUM_Q - *(correct+i);
       *(score+i) = 2 * (*(correct+i));
   }
}

double average(int *score, int NUM_STUDENT)
{
   double sum = 0.0;
   for (int i = 0; i < NUM_STUDENT; i++)
   {
       sum += *(score+i);
   }

   return sum / NUM_STUDENT;
}

void Display(string *id, int *correct, int *incorrect, int *score, double average, int NUM_STUDENT)
{
   system("cls");
   cout << "ID\t\tCorrect Answers\t\tIncorrect Answers\tScore\n\n";
   for (int i = 0; i < NUM_STUDENT; i++)
   {
       cout << *(id+i) << "\t\t\t" << *(correct+i) << "\t\t\t" << *(incorrect+i) << "\t\t " << *(score+i) << endl;
   }

   cout << "\n\nSummary:\n\n";
   cout << "Test Score Average: " << fixed << showpoint << setprecision(2) << average << endl;
}

int findHigh(string *id, int *score, int NUM_STUDENT)
{
   int max = *score;
   for (int i = 1; i < NUM_STUDENT; i++)
   {
       if (max < *(score+i))
           max = *(score+i);
   }

   return max;
}