Question

What did I do wrong with this C++ code?

Assume that we don't need to ask users for the number of students.

#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;

}

Answer 1

#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
total = 0; // initialize total to 0

//**************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;

}

Output:

How many student grades do you want to enter:5 
Enter 5 students grades
56
66
75
82
59
grades for student 1: is 56
grades for student 2: is 66
grades for student 3: is 75
grades for student 4: is 82
grades for student 5: is 59
Average grade is $67.6

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