User:Ateremetskyi

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Name: Anton Teremetskyi

SID: 068937093

E-mail: ateremetskyi@learn.senecac.on.ca

Blog: Anton's Blog

Skype: Teremetskyi_Anton

IRC Nick: ateremetskyi

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My Links:

Student List

OOP344 Main Page

Team Page

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Class notes : 09.02.2012

    int(*fptr[3])(int, int){name1, name2, name3};

The better way to validate any attribute is to use functions .

    ValidYear = getYear(Year); // Bool function

Check what do functions cin.clear()and others mean .

I like the way the teacher sends the output to the function

    sendMsg("The number is", double number); // Something like that

    bool validCCV(int ccv){
         return ccv >= 100 && ccv <= 999;
    } // Better example of the function above .

HomeWork - I have to understand how the program the teacher used works. I can find that program by the date in SVN. Then, I have to finish the assignment 1 (I did not send it yet, some errors appear).

The class on Monday is going to be in T2107 lab.

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Class notes : 23.02.2012

1. Virtual functions 2. Frames 3. CField

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Exception

#include <iostream>
using namespace std;

int main(void)
{
int x = 10;

try
{
while(x--)
{
if(x == 4) { throw x; }

cout << " pass" << x << endl ;
}
}
catch(int x)
{
cout << "got it >> " << x << " << " << endl;
}

return 0;
}

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Pretty TXT stream ( WRITE )

FILE Datafile.txt

Hello, I am jack and I am 
35
years old.

==

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

int main(){
ofstream fout("datafile.txt");
fout<<"Hello, I am jack and I am "<<endl<<35<<endl<<"years old.\n";
return 0;
}

---------------

int main(){
ifstream fin("datafile.txt");
char str[100];
fin>>str;
  cout<<str<<endl; // Hello,
fin.getline(str, 99, '\n');
  cout<<str<<endl; // I am jack and I am
str[0] = fin.get();
  cout<<str[0]; // 3
cout<<"TheEnd"<<endl;
return 0;
}

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Interesting Custom print statement

#include <cstdio>
using namespace std;

class Output{
public:
Output& print(const char* str){
printf(str);
return *this;
}
Output& print(int a){
printf("%d", a);
return *this;
}
};

int main(){
Output fout;
fout.print("Hello, I am jack and I am ").print(35).print(" years old.\n");
return 0;
}

OR

#include <cstdio>
using namespace std;

class Output{
public:
void print(const char* str){
printf(str);
}
void print(int a){
printf("%d", a);
}
};

int main(){
Output fout;
fout.print("Hello, I am jack and I am ");
fout.print(35);
fout.print(" years old\n");
return 0;
}

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Read the written in the prev example file

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

class Employee{
char _name[15];
char _lastname[30];
int _empno;
double _salary;
public:
Employee(const char* name="", const char* lastname="", int empno=0, double salary=0.0){
set(name, lastname, empno, salary);
}
void set(const char* name="", const char* lastname="", int empno=0, double salary=0.0){
strcpy(_name, name);
strcpy(_lastname, lastname);
_empno = empno;
_salary = salary;
}
ostream& print(ostream& OS)const{
return OS<<"Name: "<<_name<<" "<<_lastname<<endl<<"EmpNo: "<<_empno
<<", Salary: "<<_salary;
}
virtual ~Employee(){
//print(cout)<<"is dead!!!!"<<endl;
}
};
ostream& operator<<(ostream& OS, const Employee& E){
return E.print(OS);
}

int main(){
Employee E;
fstream file("emp.bin",ios::in|ios::binary);
for(int i=0;i<5;i++){
file.read((char*)&E, sizeof(Employee));
cout<<E<<endl<<endl;
}
return 0;
}

OR

1. include <iostream>
2. include <fstream>
3. include <cstring>

using namespace std;

class Employee{

char _name[15];
char _lastname[30];
int _empno;
double _salary;

public:

Employee(const char* name="", const char* lastname="", int empno=0, double salary=0.0){
set(name, lastname, empno, salary);
}
void set(const char* name="", const char* lastname="", int empno=0, double salary=0.0){
strcpy(_name, name);
strcpy(_lastname, lastname);
_empno = empno;
_salary = salary;
}
ostream& print(ostream& OS)const{
return OS<<"Name: "<<_name<<" "<<_lastname<<endl<<"EmpNo: "<<_empno
<<", Salary: "<<_salary;
}
virtual ~Employee(){
//print(cout)<<"is dead!!!!"<<endl;
}

}; ostream& operator<<(ostream& OS, const Employee& E){

return E.print(OS);

}

int main(){

Employee E;
fstream file("emp.bin",ios::in|ios::binary);
file.seekg((ios::off_type)0, ios::end);
int loc = file.tellg();
while(loc > 0 ){
loc -= sizeof(Employee);
file.seekg((ios::pos_type)loc);
file.read((char*)&E, sizeof(Employee));
cout<<E<<endl;
}
return 0;

}

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Write classes to the file

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

class Employee{
char _name[15];
char _lastname[30];
int _empno;
double _salary;
public:
Employee(const char* name="", const char* lastname="", int empno=0, double salary=0.0){
set(name, lastname, empno, salary);
}
void set(const char* name="", const char* lastname="", int empno=0, double salary=0.0){
strcpy(_name, name);
strcpy(_lastname, lastname);
_empno = empno;
_salary = salary;
}
ostream& print(ostream& OS)const{
return OS<<"Name: "<<_name<<" "<<_lastname<<endl<<"EmpNo: "<<_empno
<<", Salary: "<<_salary;
}
virtual ~Employee(){
//print(cout)<<"is dead!!!!"<<endl;
}
};
ostream& operator<<(ostream& OS, const Employee& E){
return E.print(OS);
}

int main(){
Employee E[5]={
Employee("John", "Doe", 1234,12345.67),
Employee("Jack", "Brown", 22345,212345.67),
Employee("Bill", "Red", 3234,32345.67),
Employee("Louis", "Clark", 41234,42345.67),
Employee("Homer", "Simpson", 5234,52345.67)
};
fstream file("emp.bin",ios::out|ios::binary);
for(int i=0;i<5;i++){
file.write((const char*)&E[i], sizeof(Employee));
}
return 0;
}