4-4. Create a program that will use pointers to determine the average (to 1 deci

Question

4-4.   Create a program that will use pointers to determine the average (to 1 decimal place) of a series of grades entered into an array. You can assume a maximum of 15 students and the user will end input with a sentinel value.

   You will use a function called getgrades. Send the array name (a pointer constant) to the function and accept it as a pointer variable (you can now use the pointer to increment through the array). Hint: 4-3 increments a pointer through an array. Using the pointer, keep accepting grades to fill up the array until they enter a sentinel value. Input into where the pointer is pointing. When the sentinel is entered, you will only return the number of grades entered.

   Back in main, by setting a grade pointer to the beginning of the grades array, you will use the pointer to increment through each grade (only the grades inputted) to compute the total by using a pointer comparison. You will then use the total to compute and print out the average grade in main.

Explanation / Answer

Dear Asker,

Following is the C++ implementation of the problem:

#include <iostream>

using namespace std;

int getGrades(int* gradArray)
{
int inputGrade;
int count=0;
cin>>inputGrade;
while(inputGrade!=-1)
{
count++;
*gradArray=inputGrade;
gradArray++;
cin>>inputGrade;
}
return count;
}

int main()
{
int inputGradeArray[15];

int numStudents = getGrades(inputGradeArray);
float gradeAverage = 0;
for (int* initalPointer = inputGradeArray; initalPointer!=inputGradeArray+numStudents; initalPointer++){
gradeAverage+= *initalPointer;
}
gradeAverage/=numStudents;
cout<<"The average grade is :"<<gradeAverage;
}

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