Embed Size (px)
Citation preview
Class Scopeclass Student
{
private:
string id;
string firstName, lastName;
float gpa;
public:
void Read()
{
cin >> id >> firstName >> lastName >> gpa;
}
void Print()
{
cout << endl;
cout << setw(9) << id << setw(20) << firstName
<< setw(20) << lastName << setw(5) << gpa;
}
};1
Class Tournamentclass Tournament{private: RatingAdjustmentLevel chart[MAX_LEVELS]; PlayerList allPlayers; char command; // Class Scope! void processOneCommand() { switch ( command ) { case 'A': // inputs then calls add method break; . . . } }
public: void processAllTransactions() { cin >> command; while ( !cin.eof() ) { processOneCommand(); cin >> command; } }}; // Tournament
2
Without Class Variableclass Tournament{private: RatingAdjustmentLevel chart[MAX_LEVELS]; PlayerList allPlayers; // char command; void processOneCommand(char command) { switch ( command ) { case 'A': // inputs then calls add method break; . . . } }
public: void processAllTransactions() { char command; cin >> command; while ( !cin.eof() ) { processOneCommand(command); cin >> command; } }}; // Tournament 3
Class Tournamentclass Tournament{private: RatingAdjustmentLevel chart[MAX_LEVELS]; PlayerList allPlayers; Player p1, p2; // Class Scope! void processOneCommand() { switch ( command ) { case 'A': // inputs then calls add method
p1.read();
. . . break;
case 'D':
p1.readName();
. . .
break;
case 'P':
p1.readName(); // p1 is the winner
p2.readName(); // p2 is the loser
. . .
break; } }public: . . .}; // Tournament 4
Class Tournamentclass Tournament{private: RatingAdjustmentLevel chart[MAX_LEVELS]; PlayerList allPlayers; Player p1, p2; // Class Scope! int addingResult; // Class Scope! void processOneCommand() { switch ( command ) { case 'A':
p1.read();
addingResult = allPlayers.add( p1 ); // Must pass p1
displayAddingMessage(); // Better do it here! break;
. . .
break; } }
void displayAddingMessage() const
{
// Access p1 and addingResult
}public: . . .}; // Tournament
5
Class Tournamentclass Tournament{private: RatingAdjustmentLevel chart[MAX_LEVELS]; PlayerList allPlayers; Player p1, p2; // Class Scope! int adjAmt; // Class Scope!
void processOneCommand() { switch ( command ) {
. . .
case 'P':
case 'p':
p1.readName();
p2.readName();
// Before call: Do we know adjAmt and rating for p1 and p2?
allPlayers.processMatchResult( chart, p1, p2, adjAmt );
// After call: Do we know adjAmt and rating for p1 and p2?
displayMatchResultMessage();
break; } }
public: . . .}; // Tournament
6
Class PlayerListclass PlayerList
{
private:
Player list[MAX_PLAYERS];
int numPlayers;
public:
// No const for p1 and p2!
void processMatchResult( const RatingAdjustmentLevel chart[],
Player& p1, Player& p2, int& adjAmt )
{
int index1 = find( p1 );
int index2 = find( p2 );
p1 = list[index1];
p2 = list[index2]; // Copy operation
// Figure out adjAmt and update p1 and p2
list[index1] = p1;
list[index2] = p2; // Copy operation
}
}; // PlayerList7
Programming Grand Rule
Each function / method
including the main function
can have at most 30 lines!
We don’t count the starting and ending braces, but we do count all lines within the braces, including comments and blank
lines!
8
Schedule
• Lab 9: Grace today
• Program 5
Due Wednesday, April 20
Grace Tuesday, April 26
• Thursday
Do Program 5
9
