Computer investigatory project

7/25/2019 Computer investigatory project

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ABOUT C++ABOUT C++

The C++ programming language was developed at

AT&T Bell laboratories in the early 1980s by Barne

!troustrup" #e $ound out %C la'(ing $or stimulating

and de'ide to e)tend the language by adding$eatures" Barne !troustrup 'alled it %C with 'lasses

originally" The name C++ was 'oined by *i'(

as'itti where %++ is the C in'rement operator"

,ver sin'e its birth- C++ evolved to 'ope with

problems en'ountered by users- and through

dis'ussions at AT&T" The maor reason $or its su''essis the support $or .be't .riented /rogramming

../- whi'h is most near to real world situations"

ABOUT THE PROJECTABOUT THE PROJECT

This is a program based on student reports" This

program helps us to do the basi' operations done in

binary 2les i"e"

CreateAppend!ear'hodi$y- and3elete


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student details" This also uses ../ $eatures li(e data

abstra'tion and en'apsulation whi'h is implemented

by the 'reation o$ obe't- based on a 'lass here

4student" 5n this program- student re'ords mainly

'onstitute the $ollowing data67

*oll no6 o$ the studentamear(s out o$ 100 s'ored by the student in

/hysi's- Chemistry- aths- ,nglish- and

Computer !'ien'e"/er'entagerade

This program mainly wor(s under three menus67

ain menu6 This menu helps us to go to result

menu or entry menu as per the entered 'hoi'e" *esult menu6 This menu displays the 'lass result-

student result a''ording to the 'hoi'e given by

the user" ,ntry menu6 This menu helps us to 'reate-

display- sear'h- modi$y and delete student

re'ords a''ording to the 'hoi'e entered by the

user"

This program also $a'ilitate us to get ba'( to the

main menu whenever re:uired and also helps us to

e)it the program" These $un'tions are 'ontrolled by

the di;erent menus"


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#A*3!,3

1"?eyboard7101 buttons@"onitor"C/>"/rinter75n(et

"ouse7three button mouse

55> *,D>5*,,T55> *,D>5*,,T

1"/ersonal Computer/C@"1@8 B *A"


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GGprogram 'ode

GGheader 2les used

#include

#include

#include

#include

#include

#include

GG'lass de2nition

class student

{

int rollno; GGto store rollno6o$student

char name[50]; GGto store name o$ student

int p_marks,c_marks,m_marks,e_marks,cs_marks; GGto store mar(s

GGo$ di; sube'ts


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float per; GGto store per'entage

char grade;GGto store grade

oid calculate!"GGto 'al'ulate per'entage and assign grade

{

per!p_marks$c_marks$m_marks$e_marks$cs_marks"%5.0;

if!per>&0"

grade'(';

else

if!per*5"

grade'+';

elseif!per0"

grade'-';

else

if!per0"

grade'/';

else

grade'';

1

pu2lic3


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oid getdata!"

GGto input all data members

{

coutrollno;

cout


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cout


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{

return rollno;

11;

GGglobal de'laration o$ variables

fstream fp;

student st;

GG$un'tion de2nition to 'reate and append student details

oid rite_student!"

{

fp.open!4=tudent.dat4,ios332inar9@ios33app@ios33out";

char ans;

do

{

st.getdata!";

fp.rite!!charA")st,siBeof!st"";

cout


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GG$un'tion de2nition to display details o$ all students

oid displa9_all!"

{

clrscr!";

cout


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hile!fp.read!!charA")st,siBeof!st"""

{

if!st.ret_rollno!"n"

{

clrscr!";

st.shodata!";

flag:;2reak;

11

fp.close!";

if!flag0"

cout


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hile!fp.read!!charA")st,siBeof!st""))found0"

{

if!st.ret_rollno!"no"

{

st.shodata!";

cout


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clrscr!";

int no;

student st;

cout


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{

clrscr!";

fp.open!4=tudent.dat4,ios332inar9@ios33in";

if!Lfp"

{

cout


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1

GG$un'tion de2nition $or result menu

oid result!"

{

clrscr!";

int ans;

char ch;

cout


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cout


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{

case :3rite_student!";2reak;

case P3displa9_all!";2reak;

case 3search_student!";2reak;

case 3modif9_student!";2reak;

case 53delete_student!";2reak;

case 32reak;

1

1

GGmain program

oid main!"

{

clrscr!";

int ch;

do

{

cout


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cin>>ch;

sitch!ch"

{

case :3result!";

2reak;

case P3entr9_menu!";2reak;

case 3eNit!0";

1

1hile!chL";

getch!";

1

GGprogram ends

GGHHHHHHH,3 .= /*.I,CTHHHHHHHHHH

A5 ,> !C*,,


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,T*J ,>7C*,AT5. A3A//,35 .= *,C.*3!


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35!/KAJ5 AKK *,C.*3!


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*,!>KT ,>

CKA!! *,!>KT


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!T>3,T *,/.*T CA*3


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!,A*C#5 A /A*T5C>KA*

*,C.*3


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.35=J5 A *,C.*3

3,K,T5 A /A*T5C>KA*

*,C.*3


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,T,*5 BAC? T. A5 ,>


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CKA!! *,!>KT


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!T>3,T *,/.*T CA*3


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HHHHHHH,L5T =*.

/*.*AHHHHHHH


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This program is mainly

designed so as to input details o$ the student su'h

as roll no- name and mar(s o$ sube'ts and to$un'tion the basi' operations done in binary 2les6

sear'h- append- delete- and modi$y" This program

also displays the student progress 'ard and also the

'lass result in'luding their per'entage and grade"

But this program allows us to

input a limited number o$ entities li(e roll no- name-


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and mar(s" This program 'an be made more eM'ient

by introdu'ing new menus and by in'luding more

entities so as to store 'omplete details o$ the

student whi'h will be use$ul in the near $uture"

www.google.com

Computer Science with C++ class

!! "# Sumita Arora

Documents

Computer investigatory project