Question

C++ Programming-Need getGrades function (I keep getting errors).

1. Write a function called getGrades that does the following:

• Take an array of integers and an integer representing the size of the array as parameters.

• Prompt the user to enter up to 20 grades.

• Store the grades in the array.

• Return the number of grades entered.

4. Write another function called calcStats that does the following:

• Take an array of integers and an integer representing the size of the array as normal parameters.

• Use three reference variables to return the lowest, highest, and average grades.

5. In your main function do the following:

• Create an array of 20 elements.

• Use the getGrades function to get the grades from the user.

• Use the calcStats function to calculate the lowest, highest, and average grades.

• Display the results.

• Sample output:

• Please enter up to 20 grades followed by a -1 when you are done.
  67
  87
  92
  78
  82
  -1
  Lowest grade: 67
  Highest grade: 92
  Average grade: 81.2

Answer 1

#include<iostream>
using namespace std;
//the below function stores the grades in array upto size or till -1 is encountered and returns the number of grades entered
int getGrades(int grades[],int size)
{
int gradeCount=0,grade;
cout<<"Please enter up to 20 grades followed by a -1 when you are done."<<endl;
//read the grade from user
cin>>grade;
//check the grade if it is -1 stop the process otherwise continue reading next grade
while(1)
{
if(grade==-1 || gradeCount>=size)
break;
grades[gradeCount]=grade; //store the grade in array
++gradeCount;
cin>>grade; //read the next grade from the user
}
return gradeCount;
}
//calculate lowest,highest and average of grades
void calcStats(int grades[],int size,int &lowest,int &highest,double &average)
{
int i;
double sum=0.0;
lowest=grades[0];
highest=grades[0];
for(i=1;i<size;++i)
{
if(lowest>grades[i])
lowest=grades[i];
if(highest<grades[i])
highest=grades[i];
}
//calculate sum
for(i=0;i<size;++i)
sum+=grades[i];
average=sum/size;
}
int main()
{
//create array of 20 elements
int grades[20];
//call getGrades() to return the total number of grades
int total=getGrades(grades,20);
int lowest,highest;
double average;
//call calcStats() to calculate lowest,highest and average of grades
calcStats(grades,total,lowest,highest,average);
cout<<"Lowest grade: "<< lowest<<endl;
cout<<"Highest grade: "<< highest<<endl;
cout<<"Average grade: "<< average<<endl;
}

Output