Comp sc Prac File XII

8/13/2019 Comp sc Prac File XII

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Computer science

Practical file

Prangav Singhal

XII-d

Roll no.-03


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ACKNOWLEDGEMENT

I gratefully acknowledge the valuable contributions of all those who

helped me to complete this practical file successfully.

First of all, I would like to thank my Computer Science teacher,

Mrs. Pooja Gupta, who gave this important topic, her invaluable

guidance and made this practical file possible.

Special thanks are due to my parents who helped me to coordinate

the entire activity and provided necessary assistance.


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INDEX

1. Structures

2. Classes And Objects

3. Constructors And Destructors

4. Inheritance: Extending Classes

5. File Handling

6. Pointers

7. Arrays

8. Linked Lists, Stacks And Queues

9. Structured Query Language


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STRUCTURES


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1. Write a program using a structure Country to store information of three countries

comprising its Capital Name and Per Capita Income and display the information according

to Country Name entered by the user.

#include

#include

#include

#include

struct Country

{ char countryname[20];

char capname[20];

long unsigned int percapitainc;

};

void main()

{ clrscr();

Country c[3];

for (int i=0 ; i


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2. Write a program in C++ to make a structure Time and to add two variables of structure Time

and to display them on screen and the total time.

#include

#include

struct time

{ int hours;

int minutes;

int seconds;

};

void main()

{ clrscr();

time t1,t2,t3;

cout


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OUTPUT


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3. Declare the structure having the following data members- code, bill, amount and no.

of units consumed. Compute the electricity bill such that :

Unit Consumption Bill Amount

100 units Rs. 0.8

Next 200 units Rs. 1.2

Next 300 units Rs. 2.0

Beyond 600 units Rs. 3.0

#include

#include

struct elect

{ int code;

char name[45];

int unit;

float bill;

};

void main()

{ elect e1;

coute1.code;

coute1.unit;

cout


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OUTPUT:

....


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CLASSES

AND

OBJECTS


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4. Define a class travelplan in c++ with the following descriptions :

Private members:

Plancode long Place string No of trains int No of buses int

Public:

a constructor to initialize the value of plan code as 1001, place asagra,no oftrains=5, no of buses=1.

newplan() - allow user to enter plancode, place, no. of trains, no of buses andassign the value to no. of buses as given:

no of trains no of buses

=20 & =40 3

showplan()to display data members.

#include

#include

class travelplan

{ long plancode;

char place[78];

int not;

int nob;

public:

travelplan()

{ plancode=1001;

strcpy(place,"agra");

not=5;

nob=1;

}

void newplan()

{ cout


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cin>>plancode>>place>>not>>nob;

if(not=20&&not=40)

nob=3;

}

void showplan()

{ cout


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OUTPUT:


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cal_penalty();

}

void dispdata()

{ cout


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OUTPUT:


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6. Create a class Account that stores Account Number, Customer Name and Balance.

Include necessary member functions in order to achieve the following tasks:

to deposit the amount to withdraw the amount such that the minimum balance in the account is Rs. 500 to display the account details

#include

#include

#include

#include

class account

{ long unsigned int acc_no;

char cust_name[20];

double balance;

public:

void get_info()

{ coutacc_no;

cout


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void withdraw()

{ double amnt;

cout


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7. Define a class Candidate with the following members:

Private members :

Roll no long Score float Name string Remarks string AssignRem() - to assign remarks as per the score obtained by the candidate

Score Remark

>=50 selected

=50)

strcpy(rem,"selected");

else

strcpy(rem,"not selected");}

public :

void enter()

{ coutrno;

cout


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AssignRem();

}

void display()

{ cout


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8. Define a class Nutrition having the following members:

Private members:

Access no. int Calories int Name of food char[20] Foodtype char[30] Cost float Assignaccess() - to return a random access no. between 10 and 1000.

Public members:

Intake() - to input the food name, food type, calories and the cost. Output() - to display all the details if the foodtype is fruit.

#include

#include

#include

#include

class Nutrition

{ int accessno, cal;

char name[20] , foodtype[30];

float cost;

int assignaccess()

{ return(10+random(991));}

public:

void Intake()

{ coutcal;coutcost;

cout


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cout


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OUTPUT:


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CONSTRUCTORS AND

DESTRUCTORS


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9. Illustrate the working of constructors and destructors through a suitable c++ code.

#include

#include

class student{ int admno;

char name[40];

public :

student()

{ cout


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OUTPUT:


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OUTPUT:


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INHERITANCE:

EXTENDING CLASSES


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11. Write a program in C++ to show the order of constructor and destructor invocation in a class.

#include

class A

{ public:

A()

{ cout


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{ cout


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OUTPUT:


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OUTPUT:


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FILE HANDLING


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OUTPUT:


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14. Write a program in c++ to display the name and admission number of students from a

file.

#include

#include

struct student

{ int admno;

char name[20];

};

void main()

{ student s1;

ifstream fin("abc.dat",ios::binary);

fin.read((char *)&s1,sizeof(s1));

while(!fin.eof())

{ cout


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OUTPUT:


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15. Write a program to read a file character by character and count the number of

alphabets in the file.

#include

#include

#include

void main()

{ ofstream fout("loren.txt");

fout


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OUTPUT:


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16. Write a program to read a file character by character and count the number of blanks

in the file.

#include

#include

#include

void main()

{ char ch;

int ct=0;

ofstream fout("abc.txt");

fout


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OUTPUT:


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OUTPUT:


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18. Write a program to read a file word by word and count the number of words starting

with a vowel.

#include

#include

#include

void main()

{ char a[20];

int ct=0;

ofstream fout(abc.txt);

fout


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OUTPUT:


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19. Write a program in c++ to read a file and count the number of lines in the file.

#include

#include

#include

#include

void main()

{ ofstream fout("loren.txt");

fout


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OUTPUT:


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20. Write a program to read a file line by line and count the number of lines starting with

the letter I.

#include

#include

#include

void main()

{ char a[20];

int ct=0;

ofstream fout(abc.txt);

fout


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21. Write a program in c++ to write, display, search, append and modify in a file.

#include

#include

#include

#include

struct student

{ int admno;

char name[20];

};

void create();

void disp();

void app();

void modify();

void main()

{ int ch;

while(1)

{ cout


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ofstream fout("stud.dat",ios::binary|ios::app) ;

student s1;

do

{ cout


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fin.read((char*)& s1,sizeof(s1));

while(!fin.eof())

{ cout


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OUTPUT:


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POINTERS


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22. WAP to reverse a string (character array) using pointers.

#include

#include

#include

void print(char *p)

{

int len=strlen(p),i=0;

char *d=&p[len-1];

while(i


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23. WAP to find whether a string is a palindrome or not, using pointers.

#include

#include

#include

int palindrome(char *ps){

int len=strlen(ps),i=0;

char rev[80],t;

strcpy(rev,ps);

char *pr=rev,*d=&pr[len-1];

while(i


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OUTPUT:


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24. WAP to accept a string and a character and print the number of times the character

has occurred in the string.

#include

#include

#include

void main()

{

int ct=0,len,i=0;

char s[80],c;

cout


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OUTPUT:


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ARRAYS


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25. Display the values divisible by 2 in the 2d array entered by the user.

#include

void dispnten(int b[3][4],int r,int c)

{ for(int i=0;i


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OUTPUT:


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26. Write a function which accepts an integer array and its size as arguments and assigns

the elements into a 2d array of integers in the following format:

If the array is : 1 2 3 4 5 6

The resultant 2d array is: 1 2 3 4 5 6

1 2 3 4 5 0

1 2 3 4 0 0

1 2 3 0 0 0

1 2 0 0 0 0

1 0 0 0 0 0

#include

void fun(int a[32],int s)

{ int i,j,b[34][23];

for(i=0;i


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OUTPUT:


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27. Write a function to swap the rows in a 2d array entered by the user.

#include

void fun(int a[67][56],int r,int c)

{ int i,temp;

for(int j=0;j


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OUTPUT:


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28. Write a program in c++ to create, search, sort, insert, delete and display a one

dimensional integer array.

#include

#include

const int size=50;

int a[size],n;

void create()

{ coutn;

for(int i=0;i>a[i];

}

void search() //binary search

{ coutnum;

while(beg


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void sort() //insertion sort

{ int i,j,temp;

for(i=1;ipos;--i)

a[i]=a[i-1];

coutnum;

a[pos]=num;

++n;

}

void display()

{ cout


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{ if(a[i]==num)

{ pos=i;

f=1;

break;

}

}

if(f==1)

{ for(i=pos;i


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OUTPUT:


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29. Assume an array e containing elements of structure employee is required to be

arranged in descending order of employee number. Write a function in c++ to arrange the

same using insertion sort.

#include

#include

#include

struct employee

{ int eno;

char name[23];

float salary; };

void desc(employee a[],int n)

{ employee temp;

int j;

for(int i=1;ia[j].eno&&j>=0)

{ a[j+1]=a[j];

j--;

}

a[j+1]=temp;

}

for(i=0;i


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Q30. Write a program in C++ to sort an array using Bubble Sort Method. The array and its size to

be given by the user.

#include

void BubbleSort(int a[20], int n)

{ for(int i=0; i


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31. Write a program in C++ to sort an array using Exchange Selection Method. The array and its

size to be given by the user.

#include

void ESelection(int a[20],int n)

{ int i,small,pos,j,temp;

for(i=0;i


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LINKED LISTS, STACKS

AND QUEUES


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32. Write a program in c++ to insert, delete and display in a static queue.

#include

#include

#include

int a[5];

int top=-1;

void insert()

{ if(top==4)

coutn;

top++;

a[top]=n;

}

}

void del()

{ if(top==-1)

cout


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}

void main()

{ int ch;

while(1)

{ cout


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OUTPUT:


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33 . Define function stackpush() to delete and display , for a static circular queue of array q[10].

#include

const int s=10;

void stackpush(int q[10],int &f,int &r)

{

if(((f==0)&&r==(s-1))||(f==r+1))

{ cout


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else if(f==s-1)

f=0;

else

f=f+1;

}

}

void traversal(int q[10],int &f,int &r)

{

if(f==-1)

cout


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switch(choice)

{ case 1: stackpush(queue,front,rear);break;

case 2:stackpop(queue,front,rear);break;

case 3:traversal(queue,front,rear);break;

}

coutch;

}while(ch=='y');

}


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OUTPUT:


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34. Write a program in c++ to push, pop, delete in a dynamic stack.

#include

#include

#include

struct stud

{ int admno;

char name[20];

stud * link;

} * top=NULL;

void insert()

{ stud*temp=new stud;

cin>>temp->admno;

gets(temp->name);

temp->link=NULL;

if(top==NULL)

top=temp;

else

{ temp->link=top;

top=temp;

}

}

void del()

{ if(top==NULL)

coutlink=NULL;

delete temp;

}

}

void display()


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{ if(top==NULL)

cout


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OUTPUT:


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35. Write a program in c++ to insert, delete and display in a dynamic queue.

#include

#include

#include

struct stud

{ int admno;

char name[20];

stud * link;

} * f=NULL, * r=NULL;

void insert()

{ stud*temp=new stud;

cin>>temp->admno;

gets(temp->name);

temp->link=NULL;

if(f==NULL)

f=r=temp;

else

{ r->link=temp;

r=temp;

}

}

void del()

{ if(f==NULL)

coutlink=NULL;


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delete temp;

}

}

void display()

{ if(f==NULL)

cout


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OUTPUT:


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Employees

Empid First name Last name address City

010 George Smith 83 first

street

Howard

105 Mary Jones 842 vine

ave

Losantiville

152 Sam Tones 33 elm st Paris

215 Sarah Ackerman 440 us 110 Upton

335 Henry Williams 12 moore

street

boston

441 Peter Thompson 11red read Paris

300 Robert Samuel 9 fifth cross Washington

Empsalary

empid salary benefits designation

010 75000 15000 Manager

105 65000 15000 Manager

152 80000 25000 Director

215 75000 12500 Manager

441 28000 7500 Salesman

300 45000 10000 Clerk

335 40000 10000 clerk


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WRITE SQL COMMANDS

Q1. To display first name, last name, address and city of all employees living

in paris from table employees.

Select first name, last name , address, city from employees where city=paris;

First name Last name address city

Sam tones 33 elm st paris

peter Thompson 11 red road paris

Q2. To display empid and first name in descending order of empid from table

employees.

Select empid, first name from employees order by empid desc;

Empid First name

441 Peter

335 Henry

300 Robert

215 Sarah

152 Sam

105 Mary

010 george

Q3. To display distinct designations from table empsalary.

Select distinct designation from empsalary;

Designation

Manager

Director

Salesman

clerk

Q4. To display details of employees whose last name is like_ones.


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Select * from employees where last name like _ones;

empid First name Last name address City

105 Mary Jones 842 vine ave Losantiville

152 sam Tones 33 elm st Paris

Q5. To display empid, first name and salary whose salary lies between 25000

and 50000.

Select empid, first name,salary from employees, empsalary where

employees.empid=empsalary.empid and salary between 25000 and 50000;empid First name Salary

441 Peter 28000

300 Robert 45000

335 Henry 40000

Q6.To display maximum salary among manager and clerk from the table

empsalary.

Select max(salary) from empsalary group by designation having designation in

(manager, clerk);

max(salary)

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Comp sc Prac File XII