Question

Im trying to get my program to output the Min, Max, and Average grades in main but im stuck on where it should be called. The code currently is :

#include <iostream>

#include <fstream>

#include <string>

#include <iomanip>

using namespace std;

//Read data from file and count into groups array

void GetDataFromFile(ifstream& inData, double array1[])

{

int i = 0;

while (inData >> array1[i])

{

inData >> array1[i];

i++;

}

inData.close;

}

//Display group counts

void DisplayDistribution(ifstream& inData, int groups[], string groupDesc[])

{

int processData;

while (inData >> processData)

{

cout << processData << endl;

if (processData >= 0 && processData <= 59)

{

groups[0]++;

}

if (processData >= 60 && processData <= 69)

{

groups[1]++;

}

if (processData >= 70 && processData <= 79)

{

groups[2]++;

}

if (processData >= 80 && processData <= 89)

{

groups[3]++;

}

if (processData >= 90 && processData <= 100)

groups[4]++;

}

inData.close();

cout << "****Grade Distribution ****" << endl;

for (int i = 0; i <= 4; i++)

{

cout << groupDesc[i] << "; " << groups[i] << endl;

{

cout << endl;

}

}

}

//Calculate Average Grades

double CalculateResults(double a[], double n)

{

// Find the sum of the array element

double sum = 0;

int countData = 0;

double min, max;

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

sum += a[i];

if (countData ==1)

{

min = n;

}

cout << "Minimum Grade: " << " Maximum Grade: " << fixed << setw(30) << "Average: " << CalculateResults << endl;

//Average to return

return sum / n;

}

int main()

{

int groups[5] = { 0,0,0,0,0 }; //group counts

ifstream inData; //stream file for data

double array1[20];

string groupDesc[5] = { "0~59", "60~69", "70~79", "80~89", "90~100" };

double n;

inData.open("input.txt");

if (inData)

{

cout << "Process file..." << endl;

cout << fixed << showpoint << setprecision(1); //decimal precision

GetDataFromFile(inData, array1); // Function Calls

DisplayDistribution(inData, groups, groupDesc);

}

else

{

cout << "Error Reading File" << endl;

}

system("pause");

return 0;

}

Answer 1

#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;

//Read data from file and count into groups array
void GetDataFromFile(ifstream& inData, double array1[])
{
   int i = 0;
   while (inData && (i < 20))
   {
       inData >> array1[i];
       i++;
   }

}

//Display group counts
void DisplayDistribution(double inData[], int groups[], string groupDesc[])
{  
   double processData;
     for(int i=0; i< 20;i++)
   {
   processData = inData[i];   
       cout << processData << endl;
       if (processData >= 0 && processData <= 59)
       {
           groups[0]++;
       }else if(processData >= 60 && processData <= 69)
       {
           groups[1]++;
       }else if(processData >= 70 && processData <= 79)
       {
           groups[2]++;
       }else if (processData >= 80 && processData <= 89)
       {
           groups[3]++;
       }else if(processData >= 90 && processData <= 100)
       {
           groups[4]++;
       }
   }
  
   cout << "****Grade Distribution ****" << endl;
   for (int i = 0; i <= 4; i++)
   {
       cout << groupDesc[i] << "; " << groups[i] << endl;
   }
  
   cout<<endl;
}

//Calculate Average, Maximum and Minimum Grades
// n should be int since it is size of the array
void CalculateResults(double a[], int n)
{
   // Find the sum of the array element
   double sum = 0;
   int countData = 0;
   double min, max;
   // loop to calculate the sum of elements of a, maximum and minimum element of a
   for (int i = 0; i<n; i++)
   {
       sum += a[i];
       if(i == 0) // if first value, set max and min to this values
       {
           min = a[i];
           max = a[i];
       }else
       {
           // determine and update max, and min
           if(a[i] < min)
               min = a[i];
           if(a[i] > max)
               max = a[i];
       }  
   }
   // calculate average
   double avg = sum/n;
   // display the result  
   cout << "Minimum Grade: " <<min<<" Maximum Grade: " <<max<<" Average: " << avg << endl;
}

int main()
{
   int groups[5] = { 0,0,0,0,0 }; //group counts
   ifstream inData; //stream file for data
   double array1[20];
   string groupDesc[5] = { "0~59", "60~69", "70~79", "80~89", "90~100" };
   inData.open("input.txt");
  
   if (inData)
   {
       cout << "Process file..." << endl;
       cout << fixed << showpoint << setprecision(1); //decimal precision
       GetDataFromFile(inData, array1); // Function Calls
       DisplayDistribution(array1, groups, groupDesc);
       CalculateResults(array1,20); // call CalculateResults to display the maximum, minimum and average grade
       inData.close(); // close the file, do not close the file in any of the function
   }else
   {
       cout << "Error Reading File" << endl;
   }
  
   system("pause");
   return 0;
}