Question

C++ A professor plans to store the following data for each of his students:

Last Name, First Name, Class Average (as a double), Letter Grade (“A”, “A-“, “B+”, “B”, etc.)

Write two programs for writing and reading such a file, with the user choosing the file name. Store the (int) number of students as the first data value in the file, followed by \n. Then use the following delimiter scheme:

Last Name(comma)First Name(comma)Average(space)Letter Grade(newline)

For the file writer program, input the data for the students from the user with a for-loop. You may write the values directly into the file without storing them in arrays first. For the file reader program, read the data and output it to the console window in a reasonable table format. Use getline for both first name and last name, in case there are white space characters (such as “Cyrus, Billy Ray”). You can use >> for the letter grade if you like. Note: You will probably need to use .ignore() in a few places, since >> will be followed by getline.

Answer 1

Code Writer code

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

int main()
{
   ofstream outFile;
   int numberOfrecord;
   string fName,lName;
   double grade;
   string latterGrade;
  
   outFile.open("studentData.txt");

   cout<<"How many records do you want to enter: ";
   cin>>numberOfrecord;

   for(int i=0;i<numberOfrecord;i++)
   {
       cin.ignore();
       cout<<"\nEnter first name of the student: ";
       getline(cin,fName);
      
       cout<<"Enter last name of the student: ";
       getline(cin,lName);
      
       cout<<"Enter student's grade: ";
       cin>>grade;
       cout<<"Enter student's latter grade: ";
       cin>>latterGrade;
       outFile<<fName<<","<<lName<<","<<grade<<","<<latterGrade<<endl;
   }
   cout<<"\n\nRecords are written to the studentData.txt file."<<endl;
   return 1;
}

output

reader code

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

int main()
{
   ifstream inFile;
   string fileName,fName,lName,latterGrade,line;
   double grade;
   cout<<"Enter the file name: ";
   cin>>fileName;

   inFile.open(fileName);

   if(!inFile)
   {
       cout<<fileName<<" not found exiting...."<<endl;
       return 1;
   }
   cout<<endl;
   while(getline(inFile,line))
   {
       std::stringstream linestream(line);
       std::string value;
       getline(linestream,value,',');
       fName=value;
       getline(linestream,value,',');
       lName=value;
       getline(linestream,value,',');
       grade=stod(value);
       getline(linestream,value,',');
       latterGrade=value;
       cout<<fName<<"\t"<<lName<<"\t"<<grade<<"\t"<<latterGrade<<endl;
   }

}

output

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