void OpAmps::Sort(OpAmps* Op, unsigned long length)

  switch(UserInput) {
    case '1':
      // sort according to name (in alphabetical order)
		qsort(Op,length,sizeof(OpAmps),&OpAmps::SortName);
      break;
      
    case '2':
      // sort according to slew rate (in

      case '1':
		  Enter(OpAmpObject[database_length], database_length);
        break;

int main()

struct OpAmps {
  char Name[20];  // the name of the op-amp (e.g. "741")
  unsigned int PinCount;  // the number of pins in the package
  double SlewRate;
};
  
class OpAmpDb
{
public:
	OpAmpDb();
	void Enter(OpAmps&, unsigned long&);
	void Save(const OpAmps*, unsigned

struct OpAmps {
  char Name[20];  // the name of the op-amp (e.g. "741")
  unsigned int PinCount;  // the number of pins in the package
  double SlewRate;  // the slew rate in volts per microsecond
};

void Load(OpAmps* OpAmp, unsigned long& length)
{  
  fstream input_file;  // file stream for input

   //open the file

  input_file.open(DATABASE_FILENAME,

void Enter(OpAmps& OpAmp, unsigned long& length)
// if the database is full, inform the user
{
	char line[20];
	unsigned

void Save(OpAmps OpAmp[], unsigned long length)
{  
  fstream output_file;  // file stream for output

  // open the file
  //<enter code here>

int Save(OpAmps, unsigned long);

      case '2':
        Save(OpAmp, database_length);
        break;

// Save the database to the file specified by DATABASE_FILENAME. If the file exists it
// simply overwritten without asking the user

//The database

struct OpAmps {
  char Name[20]; 
  unsigned int PinCount; 
  double SlewRate;

//The function prototypes

void Enter(OpAmps );
int Save(OpAmps );
void Load(OpAmps );
void