Explore topic-wise InterviewSolutions in Current Affairs.

Yes. Object of the class is used to distinguish between the member function of a class and a non-member function with same name.

Ex

class X {

public:

void f()

{.....}

};

void f()

{.....}

void main() {

X x;

x.f();  // member function of the class x

f();  // non-member function

} 

(i) SmallObj

(ii) private int some, more;

(iii) private void err_1(){cout<<"error";}

 public void Xdata(int d) {some=d;more=d++; }

 public void Ydata() {cout<<some<<" "<<more; }

(iv) public void Xdata(int d) {some=d;more=d++; }

#include <iostream.h>

#include<stdio.h>

#include<conio.h>

class Student

{

int roll_no;

char name[20];

char Class[8];

int marks[5]; 

flloat percentage;

float Calculate()

{ percentage = (marks[0]+marks[1]+marks[2]+marks[3]+marks[4])/5; return percentage;

}

public: void Readmarks();

void Displaymarks();

};

void Student::Readmarks() {

cout<<endl<<"Enter roll number: ";

cout<>roll_no;

cout<<endl<<"Enter name:";

gets(name);

cout<<"Enter marks in ";

for(int i=0;i<5;i++)

{

cout<<end1<<"Subject "<<i+1<<":";

 };

Calculate(); 

void Student::Displaymarks() {

cout<<"......Student Marksheet........";

cout<<end1<<"Roll number:"<<roll_no<<end1;

cout<<" Name:"<<name<<end1;

cout<<" Marks in subject-1:"<< marks[0]<<end1

;

cout<<" Marks in subject-2:"<< marks[1]<<end1;

cout<<" Marks in subject-3:"<<marks[2]<<end1;

cout<<" Marks in subject-4:"<<marks[3]<<end1;

cout<<" Marks in subject-5:"<< marks[4]<<end1;

cout<<" Percentage:"<<percentage<<end1l;

 int main()

Student obj;

obj.Readmarks();

obj.Displaymarks();

getch(); return 0; 

}

A class can have static data members as well as static member functions.

The static data members are the class variables that are common for all the objects of the class. Only one copy of static data members is maintained which is shared by all the objects of the class. They are visible only within the class but their lifetime is the entire program. They can be accessed by all the member functions. A member function that accesses only static data members of a class is static member functions. It cannot access other data members but static members.

The static data members are useful when some data values are to be shared across objects of the same class.

#include<iostream>

#include<conio.h>

#include<stdio.h>

static int days_in_month [ ] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

int day, month, year;

unsigned short day_counter; 

int is_leap(int y)

{

return

((y % 4 == 0 && y % 100 != 0) || y % 400 == 0);

}

class date

{

public: 

//int d,m,y;

void olddate(int d, int m, int y);

void next_day();

void newdate(date set_date,int days);

};

void date::olddate(int d, int m, int y)

{

m < 1 ? m = 1 : 0;

m > 12 ? m = 12 : 0;

d < 1 ? d = 1 : 0;

d > days_in_month[m] ? d = days_in_month[m] : 0;

if (is_leap(y)){

days_in_month[2] = 29;

}

else

{

days_in_month[2] = 28;

}

day = d;

month = m;

year = y;

}

 void date::next_day()

{

day += 1; day_counter++;

if (day > days_in_month[month])

{

day = 1;

month += 1; 

if (month > 12)

{

month = 1;

year += 1;

if (is_leap(year)) {

days_in_month[2] = 29;

}

else

{

days_in_month[2] = 28;

}

}

}

}

void date::newdate(date olddate,int x)

{

 int i;

 for (i=0;i<x;i++) next_day();

}

int main() {

clrscr();

date d1;

d1.olddate(22,2,1980);

d1.newdate(d1,62);

day_counter = 0;

cout<<"day:"<<day<<" month:"<<month<<" year:"<<year;

getch();

}

#include

#include 

#include

class Batsman

{

char F_Name[30];

char L_Name[30];

int Runs_made,fours,sixes;

public:

void initial()

{

cout<<end1<<"Enter Frist Name :";

gets (F-Name);

cout<<end1<<"Enter Last Name :";

gets (L-Name);

cout<<end1<<"Enter Runs Made :; 

cout<>Runs_made;

cout<<end1<<"Enter how many fours :";

cout<>fours;

cout<<end1<<"Enter how many sixes :";

cout<>sixes;

}

void update()

{ 

int new_run,new_four,new_sixes,cal_four,cal_six; 

cout<<end1<<"Enter new runs  Made:";

cout<>new_run;

cout<<end1<<"Enter new fours  Made:";

cout<>new_four;

cout<<end1<<"Enter new sives  Made:";

cin>>new_sixes;

fours=fours+new_four; sixes=sixes+new_sixes; 

cal_four=fours*4; cal_six=sixes*6; 

Runs_made=Runs_made+new_run+cal_four+cal_six; 

display();

cout<<"Total  Runs Made: "<<Runs_made<<end1;

cout<<"Number of fours: "<<fours<<end1;

cout<<"Number of sixes: "<<sixes<<end1;

}

void display()  {

cout<<".....Batsman's information....."<<end1;

cout<<"Name: "<<F_Name<<" "<<L_Name<<end1;

}

};

void main() {

clrscr();

Batsman b1;

b1.initial(); 

b1.update();

getch();

}

#include <iostream.h>

#include<stdio.h>

#include<conio.h>

class worker

{

int wno;

char wname[25];

float hewrk,wgrate;

float totwage;

float calcwg()

{

totwage = hewrk*wgrate;

return totwage;

}

public:

void in_data();

void out_data();

}; 

void worker::in_data()

{

cout<<"Enter worker number:";

cin>>wno;

cout<<"enter worker name:";\

gets(wname);

cout<<"Enter hours worked: ";

cin>>hewrk;

cout<<"Enter wage rate per hour:";

cin>>wgrate;

calcwg();

}

void worker::out_data()

{

cout<<"......Worker Information........"<<end1;

cout<<"Worker number:"<<wno<<end1;

cout<<" Worker name:"<<wname<<end1;

cout<<" Hours worked:"<< hewrk<<end1;

cout<<" Wage rate per hour:"<< wgrate<<end1;

cout<<" Total wage:"<<totwage<<end1;

}

int main()

{

worker obj; obj

in_data();

obj.out_data();

getch();

return 0;

}

#include

#include

#include

struct Name

{

char first[40];

char mid[40];

char last[60];

};

struct Phone

{

char area[4];

char exch[4];

char numb[6]; };

class P_rec

{

Name name;

Phone phone;

p_rec();

void display_rec();

};

P_rec()

{

first="abc";

mid="aaa";

last="jjj";

area=1234;

exch=7546;

numb=789456;

}

void display_rec()

{

cout<<first<<mid<<last<<area<<exch<<numb;

}

void main()

{

clrscr();

P_rec p;

p.display_rec();

getch();

}

#include<iostream.h>

#include<conio.h>

#include<stdio.h>

class Bowlers

{

char F_Name[30];

char L_Name[30];

int Overs_bowled,Maiden_overs,Runs_given,Wickets; public:

void initial() {

cout<<end1<<"Enter first name : ";

gets(F-Name);

cout<<end1<<"Enter first name : ";

gets(L-Name);

cout<<Overs_bowled;

cout<<Overs_bowled;

cout<<end1<<"Enter first name : ";

cout<<end1<<"Enter how many overs maden : ";

cin>>Runs_given;

cout<<end1<<"Enter how many wickets taken : ";

cout<>Wickets;

}

void update ()

{

int

new_over_bolwed,new_maiden_overs,new_runs_given,new_wickets;

cout<<end1<<"Enter new overs bowled: ";

cin>>new_over_bolwed;

cout<<endl<<"Enter new madden overs: ";

cin>>new_maden_overs;

cout<<endl<<"Enter new runs given:  ";

cin>>new_runs_given;

cout<<endl<<"Enter new wickets taken: ";

cin>>new_wickets;

Overs_bowled=Overs_bowled+new_over_bolwed; Maiden_overs=Maiden_overs+new_maiden_overs;

Runs_given=Runs_given+new_runs_given; Wickets=Wickets+new_wickets;

display();

cout<<"Total overs bowled: "<<Overs_bowled<<end1;

cout<<"Total maidden overs: "<<Maiden_overs<<end1;

cout<<"Total runs given: "<<Runs_given<<end1;

cout<<"Total wickets taken: "<<Wickets<<end1;

}

void display(){

cout<<".....Bolwer's information....."<<end1;

cout<<"Name: "<<F_Name<<" "<<L_Name<<end1;

}

};

void main () {

clrscr();

Bowlers b1;

b1.initial();

b1.update();

getch();

#include<iostream.h>

#include<conio.h>

#include<stidio.h>

class Library

{

int BookNo;

char BName[25];

char Author[25];

char Publisher[25];

float Price;

int No_of_Copies;

int No_of_Copies_Issued;

public:

void initial()

{

cout<<end1<<"Enter book number : ";

cout <<BookNo;

cout<<end1<<"Enter book name : ";

gets (Bname);

cout<<end1<<"Enter Author name : ";

gets (Author);

cout<<end1<<"Enter publisher name : ";

gets (publisher);

cout<<end1<<"Enter  price : ";

cin>>Price;

cout<<endl<<"Enter Number of copies: ";

cin>>No_of_Copies;

}

void issue_book ()

{

cout<<"Enter book details......."<<end1;

initial();

if(No_of_Copies>0)

{

cout<<"enter How many book you want to issue:"; 

cin>>No_of_Copies_Issued; 

if(No_of_Copies>=No_of_Copies_Issued)

{

No_of_Copies=No_of_Copies-No_of_Copies_Issued;

cout<<endl<<" "<<No_of_Copies_Issued<<" book is issued..";

display();

 }

 else

{

cout<<”Copies_Issued<<" books is not available in stock..";

}

}

else

{

cout<<"Book is not available";

}

}

 void return_book()

 {

cout<<"enter book detail you want to return...";

cout<<endl<<"Enter Book Number: ";

cin>>BookNo;

cout<<endl<<"Enter Book Name: ";

gets(BName);

No_of_Copies=No_of_Copies+No_of_Copies_Issued;

cout<<endl<<BookNo<<":"<<BName<<"Book is returned......";

 }

void display()

 {

cout<<"Book Number: "<<BookNo<<endl;

cout<<"Book Name: "<<BName<<endl;

cout<<"Author Name: "<<Author<<endl;

cout<<"publisher Name: "<<Publisher<<endl;

cout<<"Price: "<<Price<<endl;

}

};

void main ()

{

clrscr();

Library 11;

int ch;

cout<<"1->Issue book...."<<end1;

cout<<"2->Return Book....."<<end1;

cout<<"Enter your choice .. "<<end1;

cin>>ch;

switch(ch)

{

case 1:

 11.issue_book();

break;

case 2:

11.return_book();

break;

}

getch();

We will make a function inline when the functions are small that called often. Inline functions run a little faster than the normal functions as the compiler replaces the function call statement with the function code itself and then compiles the entire code. Thus, with inline functions, the compiler does not have to jump to another location to execute the function, and then jump back as the code of the called function is already available to the calling program.

#include <iostream.h>

#include<conio.h>

int x=5;

int y=3;

class Outer

{

public:

int x;

int a;

static int s;

class Inner

{

public:

int a; int x;

void f(int i)

{

x = i;

s = i;

y = i;

a = i;

}

};

Inner I1;

void g(int i)

{

x = i;

y = i;

a = i;

s = i;

}

};

int Outer::s; 

Outer Ob1; 

 int main()

{

Ob1.I1.f(3);  //statement1

Ob1.g(8);  //statement2

return 0;

}

After statement 1 and statement 2 the values are as following: ::x = 5, ::y = 8, Outer::x = 8, Outer::a = 8, Outer::s =8 , Inner::a = 3

#include<iostream.h>

#include<stdio.h>

class FLIGHT{

 long FlightCode;

 char Description[25];

 public:

void AddInfo()

{

cin>>FlightCode; gets(Description);

}

void ShowInfo ()

{

cout<<FlightCode<<":"

 <<Description<<end1;

}

};

void main() {

FLIGHT F;

F.AddInfo () ; F.ShowInfo () ;

# include<iostream.h>

# include <stdio.h>

class X  {

public:

int a,b;

void count(void)

{

a++;

}

int x; 

void init(int,int,int);

void print(void);

};

 void X::init(int i,int j,int k)

{

a = i; 

b = j;

x = k;

}

void X :: print(void)

{

count();

cout<<"a="<<a<<"b="

 <<b<<"x="<<x<<” ”;

}

void func(void);

 X Ob1;

 X Ob2;

int main() {

Ob1.init(0,1,2);

Ob2.init(2,3,4);

Ob1.print();

Ob2.print();

Ob1.count();

Ob2.count();

}

void func(void)

{

X Ob3;

Ob1.init(4,5,6);

Ob2.init(7,8,9);

Ob3.init(9,10,11);

Ob3.a = Ob3.b = Ob3.x;

#include <iostream.h>

#include <stdio.h>

class Employee

{

int EmpId;

char EName  [20] ;

public:

Employee ()  {}

void Joining()

{

cin>>EmpId; gets(EName);

}

void List()

{

cout<<EmpId<<":"

 <<EName<<endl;

}

};

void main()  {

Employee E;

E.Joining();

E.List();

}

#include <iostream.h>

#include<stdio.h>

#include<conio.h>

class Teacher

{

char name[20];

char subject[10];

float Basic,DA,HRA;

float salary;

float Calculate()

{

salary = Basic+DA+HRA;

return salary;

}

public:

void Readdata();

void Displaydata();

};

void Teacher::Readdata()

{

cout<<end1<<"Enter name:";

gets(name);

cout<<"Enter subject:";

gets(subject);

cout<<"Enter Basic :";

cin>>Basic;

cout<<"Enter DA :";

cin>>DA;

cout<<"Enter HRA :";

cin>>HRA;

Calculate();

}

void Teacher::Displaydata()

{

cout<<"......Teacher Details........"<<end1;

cout<<"Name:"<<name<<end1;

cout<<" Subject:"<<subject<<end1;

cout<<" Basic:"<<Basic<<end1;

cout<<" DA:"<<DA<<end1;

cout<<" HRA:"<<HRA<<end1;

cout<<" Salary:"<<salary<<end1;

int main()

{

Teacher obj;

obj.Readdata();

obj.Displaydata();

getch();

return 0;

}