Question

For C++ program

Your program should first prompt the user for the number of students they wish to enter. For each student, the user will be prompted to enter the student’s name, how many tests the student has taken, and the grade for each test. Each test’s grade will be inputted as a number representing the grade for that test. Once each student’s information has been entered, the program will display the number of students. Additionally, each student will have their name, list of test scores displayed.

Your program must have at least the following functions:

int inputData(string*&, double**&);

     The inputData function accepts a string pointer and a pointer to a double pointer, both passed by reference. Inside the function, the user will be prompted to enter how many students they will input. For each student, the user will input the student’s name and a list of the student’s test scores. The function will return the number of students that have been entered.

After the function call, the string pointer should point to an array of every student name and the pointer to a double pointer should point to an array where each array entry contains an array of that student’s test scores. Remember that you do not know beforehand how many students will be entered or the number of test scores each student will have.

void displayData(string*, double**, int);

The displayData function accepts a pointer to the array of student names, a pointer to the array of student test scores, and the number of students. The function should output the following to the console:

The number of students,

and for each student

• the student’s name
• a list of the student’s test scores

void cleanHeap(string*, double**, int);

The cleanHeap function accepts a pointer to the array of student names, a pointer to the array of student test scores, and the number of students. Inside the function, anything that was dynamically-allocated should be cleaned up appropriately.

Additionally,

• You must validate the user’s input
  • The number of students and the number of test scores must be a positive value
  • Each test score must be between 0 and 100, inclusive

Sample Run:

How many students do you have in the system? 3

Enter the student's name: John Doe

Enter how many tests John Doe took: 4

Enter grade # 1: 95.5

Enter grade # 2: 84.3

Enter grade # 3: 80

Enter grade # 4: 88.8

Enter the student's name: Anna Mull

Enter how many tests Anna Mull took: 3

Enter grade # 1: 60

Enter grade # 2: 55.9

Enter grade # 3: 77.4

Enter the student's name: Paige Turner

Enter how many tests Paige Turner took: -1

Please enter a positive number of tests taken

Enter how many tests Paige Turner took: 2

Enter grade # 1: 75.6

Enter grade # 2: -10.3

Please enter a grade between 0 and 100

Enter grade # 2: 50.5

You have 3 students in the system.

Name of student #1: John Doe

Grades for student #1: 95.5 84.3 80 88.8

Name of student #2: Anna Mull

Grades for student #2: 60 55.9 77.4

Name of student #3: Paige Turner

Grades for student #3: 75.6 50.5

// end of sample run.

Answer 1

C++ Program:

#include <iostream>
#include <string>

using namespace std;

//Function prototypes
int inputData(string*&, double**&);
void displayData(string*, double**, int);
void cleanHeap(string*, double**, int);

//Array that holds number of scores for each student
int *scoreLength;

//Main function
int main()
{
string *names;
double** scores;
int n;

//Calling functions
n = inputData(names, scores);
displayData(names, scores, n);
cleanHeap(names, scores, n);

cout << endl;
return 0;
}

//Function that reads the data from user
int inputData(string* &names, double** &scores)
{
int i, j, nStudents, nScores;

//Prompting for number of students
cout << "How many students do you have in the system? ";
cin >> nStudents;

//Allocating memory
names = new string[nStudents];
scores = new double*[nStudents];
scoreLength = new int[nStudents];

//Iterating over each student
for(i=1; i<=nStudents; i++)
{
cout << "Enter the student's name: ";
cin.ignore();
getline(cin, names[i-1]);

while(1)
{
//Reading number of scores
cout << "Enter how many tests " << names[i-1] << " took: ";
cin >> nScores;

if(nScores < 0)
{
cout << "Please enter a positive number of tests taken" << endl;
}
else
{
break;
}
}

//Storing score length
scoreLength[i-1] = nScores;

//Allocating memory
scores[i-1] = new double[nScores];

//Iterating over scores
for(j=1; j<=nScores; j++)
{
while(1)
{
cout << "Enter grade # " << j << ":";
cin >> scores[i-1][j-1];

if(scores[i-1][j-1] < 0 || scores[i-1][j-1] > 100)
{
cout << "Please enter a grade between 0 and 100" << endl;
}
else
{
break;
}
}
}
}
return nStudents;
}

//Displaying student info
void displayData(string* names, double** scores, int nStudents)
{
int i, j;

cout << endl << "You have " << nStudents << " students in the system." << endl;

//Iterating over students
for(i=0; i<nStudents; i++)
{
cout << "Name of student #" << (i+1) << ": " << names[i] << endl << "Grades for student #" << (i+1) << ": ";

for(j=0; j<scoreLength[i]; j++)
{
cout << " " << scores[i][j];
}
cout << endl;
}
}

//Deleting memory
void cleanHeap(string* names, double** scores, int nStudents)
{
int i;

delete[] names;

//Iterating over students
for(i=0; i<nStudents; i++)
{
delete[] scores[i];
}

delete[] scores;
}

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Sample Run: