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something simple??

Oct 15, 2014 at 12:55am
elite zero (106)
Am I using the Multidimensional array wrong?

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#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <sstream>

using namespace std;

//-----------------------------------------------------------------------------

struct studentInfo
{
 string info[11][3]; // Multidimensional Array

}student;


//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------

void readFile(ifstream& input_file)
{
 string line, name, major; // Local variables
 string grade;            
 istringstream iss;        // Initialize string stream

 while(getline(input_file, line)) // Obtain lines from file
  {
   iss.clear();
   iss.str(line);
   cout << line << endl;
   if(iss >> name >> grade >> major) // Stringstream tokens
    {
     for(int i = 0; i < 11; i++) // Place variables into multi. dim. array 
      {
       student.info[i][0] = name;   // Names
       student.info[i][1] = grade;  // Grades
       student.info[i][2] = major;  // Majors
      }
    }
   else
    {
     cout << "Error getting lines!" << endl;
    }
  }//end if
}//end void readFile

//-----------------------------------------------------------------------------

void printList(studentInfo student)
{
 for(int i = 0; i < 11; i++)
  {
   cout << i;
   cout << student.info[i][0];
   cout << " ";
   cout << student.info[i][1];
   cout << " ";
   cout << student.info[i][2] << endl;
  }

}//end void printList

//-----------------------------------------------------------------------------

int main()
{
 cout << "Opening file..." << endl;
 ifstream input_file("data.txt", ios::in|ios::beg); // Opens input for reading

 if(!input_file.is_open())	// If input file doesn't open
  {	
   cout << "Error: Unable to open input file\n" << endl;
   system("pause"); // Microsoft only pause
   return(1);
  }
 else // File is open
  {
   cout << "File is open" << endl;

   readFile(input_file); // Read from file

   cout << "\nPrinting list..." << endl << endl;

   printList(student); 
  
  }

//-----------------------------------------------------------------------------

cout << endl;
system("pause"); // Microsoft only pause
return 0; // Success

}//end main
Edit & Run


Output:


Opening file...
File is open
Tom     99      CS
Clair   56      MAT
Sue     96      CS
Casey   88      MAT
James   45      CS
Frank   78      GS
Ben     52      ARCH
Laren   62      CS
Harry   78      IS
Sam     100     CS
Jennifer        68      MAT

Printing list...

0Jennifer 68 MAT
1Jennifer 68 MAT
2Jennifer 68 MAT
3Jennifer 68 MAT
4Jennifer 68 MAT
5Jennifer 68 MAT
6Jennifer 68 MAT
7Jennifer 68 MAT
8Jennifer 68 MAT
9Jennifer 68 MAT
10Jennifer 68 MAT

Press any key to continue . . .
Oct 15, 2014 at 1:03am
coltehrman (67)
Honestly I am not that experienced with most of the code you are using but my guess would be that the input variable types are not all strings, so you cannot store them all in a string array... idk... thats just my guess :/
Oct 15, 2014 at 1:05am
elite zero (106)
That shouldn't matter, it is printing out the 68 now as a string in Jennifer 68 MAT. It's got to be something with my insert I think.
Oct 15, 2014 at 1:07am
coltehrman (67)
WAIT!!! lol I see the problem... On line 36 Your program takes the first input and stores it into your array, and then it runs the while again and rewrites the whole array with the next inputed data, that is why your array contains the last line of data only
Oct 15, 2014 at 1:11am
coltehrman (67)
Get rid of your for loop and put int i = 0; outside of the while loop then do

if(iss >> name >> grade >> major)
{
student.info[i][0] = name; // Names
student.info[i][1] = grade; // Grades
student.info[i][2] = major; // Majors
}
else
error

and then incement i at the end of the loop
Oct 15, 2014 at 1:16am
elite zero (106)
Ah I see here:

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while(getline(input_file, line)) // Obtain lines from file <---------------------------------HERE
  {
   iss.clear();
   iss.str(line);
   cout << line << endl;
   if(iss >> name >> grade >> major) // Stringstream tokens
    {
     for(int i = 0; i < 11; i++) // Place variables into multi. dim. array <------------------HERE
      {
       student.info[i][0] = name;   // Names
       student.info[i][1] = grade;  // Grades
       student.info[i][2] = major;  // Majors
      }
    }
   else
    {
     cout << "Error getting lines!" << endl;
    }
  }//end if


So, now the issue is to change it so that I can put each line into the multidimensional array in different rows with each variable in a different column..... hmmmm

Oct 15, 2014 at 1:23am
coltehrman (67)
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int i = 0;
while(getline(input_file, line)) // Obtain lines from file <---------------------------------HERE
  {
   iss.clear();
   iss.str(line);
   cout << line << endl;
   if(iss >> name >> grade >> major) // Stringstream token
     {
       student.info[i][0] = name;   // Names
       student.info[i][1] = grade;  // Grades
       student.info[i][2] = major;  // Majors
      }
   else
    {
     cout << "Error getting lines!" << endl;
    }
i++;
  }//end if
Oct 15, 2014 at 1:26am
elite zero (106)
Here we are:

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#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <sstream>

using namespace std;

//-----------------------------------------------------------------------------

struct studentInfo
{
 string info[11][3]; // Multidimensional Array

}student;


//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------

void readFile(ifstream& input_file)
{
 string line, name, major; // Local variables
 string grade;            
 istringstream iss;        // Initialize string stream
 int i = 0;

 while(getline(input_file, line)) // Obtain lines from file
  {
   iss.clear();
   iss.str(line);
   cout << line << endl;
   if(iss >> name >> grade >> major) // Stringstream tokens
    {
     if(i < 11) // Place variables into multi. dim. array 
      {
       student.info[i][0] = name;   // Names
       student.info[i][1] = grade;  // Grades
       student.info[i][2] = major;  // Majors
       i++;
      }
    }
   else
    {
     cout << "Error getting lines!" << endl;
    }
  }//end if
}//end void readFile

//-----------------------------------------------------------------------------

void printList(studentInfo student)
{
 for(int i=0; i < 11; i++)
  {
   cout << student.info[i][0];
   cout << " ";
   cout << student.info[i][1];
   cout << " ";
   cout << student.info[i][2] << endl;
  }

}//end void printList

//-----------------------------------------------------------------------------

int main()
{
 cout << "Opening file..." << endl;
 ifstream input_file("data.txt", ios::in|ios::beg); // Opens input for reading

 if(!input_file.is_open())	// If input file doesn't open
  {	
   cout << "Error: Unable to open input file\n" << endl;
   system("pause"); // Microsoft only pause
   return(1);
  }
 else // File is open
  {
   cout << "File is open" << endl;

   readFile(input_file); // Read from file

   cout << "\nPrinting list..." << endl << endl;

   printList(student); 
  
  }

//-----------------------------------------------------------------------------

cout << endl;
system("pause"); // Microsoft only pause
return 0; // Success

}//end main
Edit & Run



Opening file...
File is open
Tom     99      CS
Clair   56      MAT
Sue     96      CS
Casey   88      MAT
James   45      CS
Frank   78      GS
Ben     52      ARCH
Laren   62      CS
Harry   78      IS
Sam     100     CS
Jennifer        68      MAT

Printing list...

Tom 99 CS
Clair 56 MAT
Sue 96 CS
Casey 88 MAT
James 45 CS
Frank 78 GS
Ben 52 ARCH
Laren 62 CS
Harry 78 IS
Sam 100 CS
Jennifer 68 MAT

Press any key to continue . . .


That's better, lol.

Now I have to:

-Return the average grade for the class and the student with the highest and
the lowest grade in your output.
-Next you will tell me the average from each distinct major in the output.
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