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Problem with header file

mgm2010 (6)
I am trying to compile the following code to calculate the average of grades but I get the error that GradeBook.h not found. I am primarily a student of java and I have been able to work similar codes in java without any hitch. Will be grateful for clarification as to what I should have done to avoid the error.
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#include <string> 
   using std::string;

 class GradeBook
   {
  public:
     GradeBook( string ); 
     void setCourseName( string ); 
     string getCourseName(); 
     void displayMessage(); 
     void determineClassAverage(); 
  private:
     string courseName; 
  }; 
//=============================
#include <iostream>
   using std::cout;
   using std::cin;
   using std::endl;
 
   #include "GradeBook.h" 
  
  GradeBook::GradeBook( string name )
  {
     setCourseName( name ); 
  } 
void GradeBook::setCourseName( string name )
  {
     if ( name.length() <= 25 ) 
        courseName = name; 
     else 
     { 
        courseName = name.substr( 0, 25 ); 
        cout << "Name \"" << name << "\" exceeds maximum length (25).\n"
           << "Limiting courseName to first 25 characters.\n" << endl;
     } 
  } 
  
  string GradeBook::getCourseName()
  {
     return courseName;
  } 

  
  void GradeBook::displayMessage()
  {
    cout << "Welcome to the grade book for\n" << getCourseName() << "!\n"
        << endl;
  } 

  
  void GradeBook::determineClassAverage()
  {
     int total; 
     int gradeCounter; 
     int grade; 
     int average; 

     
     total = 0; 
     gradeCounter = 1; 

     
     while ( gradeCounter <= 10 ) 
     {
        cout << "Enter grade: "; 
        cin >> grade; 
        total = total + grade; 
        gradeCounter = gradeCounter + 1; 
     } 
     
     average = total / 10; 

     
     cout << "\nTotal of all 10 grades is " << total << endl;
     cout << "Class average is " << average << endl;
  } 
//======================
#include "GradeBook.h" 
 
   int main()
   {
      
      
      GradeBook myGradeBook( "CS101 C++ Programming" );

     myGradeBook.displayMessage(); 
     myGradeBook.determineClassAverage(); 
     return 0; 
  }





firedraco (6243)
Make sure GradeBook.h is in the same directory as your other files (the .cpp).
mgm2010 (6)

Let me explain what I am doing.
1. I am using MS vis C++6.
2. I make a project directory and from File -> New, I select the 'C/C++ Header File' and add GradeBook file. I can find the GradeBook.h file in the directory.
3. Then, from File -> New, I select C++ Source File and add the remaining two codes given in post 1.
4. Then I compile and get the error ...C2011 - class type redefinition.
kbw (9488)
Rather than paraphrasing the error, it may help if you post the actual error in entirety.

The problem is described in the error message.
mgm2010 (6)
Many many thanks everyone!! The problem was solved by placing 'header guard' and 'end guard' in the header file.
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