Question

Implement and test a function that uses dynamic array to store students’ grades and calcuate the average grade.

// This program demonstrates the use of dynamic array

// it

#include <iostream>

#include <iomanip>

using namespace std;

int main()

{

float *grades; // a pointer used to point to an array

int size = 2;

grades = new float[size];

  

int count = 0; // track the number of grade/student

float grade; // the grade of a student

float average, total; // average grade and total grades

//**************start your code here************************

//**************end your code here************************

for (int i = 0; i < count; i++)

{

cout << "grades for student " << i + 1 << ": is " << grades[i] << endl;

}

for (int i = 0; i < count; i++)

{

total = total + grades[i];

}

average = total / count;

cout << "Average grade is $" << average << endl;

delete [] grades;

return 0;

}

Answer 1

Program :

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
float *grades; // a pointer used to point to an array
int size;
int count = 0; // track the number of grade/student
float grade; // the grade of a student
float average, total; // average grade and total grades

//**************start your code here************************

cout<<"How many student grades do you want to enter:";
cin>>size;
grades = new float[size];
cout<<"Enter "<<size<<" students grades"<<endl;
while(count<size)
{
cin>>grades[count];
count++;
}

//**************end your code here************************
for (int i = 0; i < count; i++)
{
cout << "grades for student " << i + 1 << ": is " << grades[i] << endl;
}
for (int i = 0; i < count; i++)
{
total = total + grades[i];
}

average = total / count;
cout << "Average grade is $" << average << endl;
delete [] grades;
return 0;

}

Screenshot of the program :

Output :