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Image Changing Effect

image এর উপর মাউস রাখার সাথে সাথে কিভাবে তার পাশে Image টি display হয় তার source code টি নিম্নে উল্লেখ করা হল-

<========================================================>

<!DOCTYPE html>

<head>

<title>Image Change</title>

</head>

<body>

</ul>

</div>

$(document).ready(function(){

$('.thumb a').mouseover(function(e)

{

e.preventDefault();

$('.imgBox img').attr("src",$(this).attr("href"));

})

</script>

</body>

</html>

CSS source Code

body{

margin: 0;

padding:0;

}

.container

{

position:absolute;

top:50%;

left:50%;

transform:translate(-50%,-50%);

}

ul. thumb

{

margin: 0 auto;

padding:0;

float:left;

}

ul.thumb li

{

list-style: none;

margin:5px;

width:100px;

height: 100px;

border:1px solid rgba(134, 74, 74, 0.2);

overflow:hidden;

}

ul.thumb li img{

width:100%;

}

.imgBox{

float:left;

width:500px;

height:500px;

border:1px solid rgba(124, 78, 78, 0.2);

overflow:hidden;

}

Dynamic Memory Allocation এবং FILE Operation and Pointer in C Program

Call by Value এবং Call by Reference ব্যাখ্যা কর ।

Call By Value	Call By Reference
Original Value এর কোনো পরিবর্তন হয় না।	এখানে Original Value এর পরিবর্তন হয় ।
এখানে ভেরিয়েবলের অনুলিপি (Copy of variable) পাস হয়ে থাকে।	এখানে ভেরিয়েবল নিজেই পাস হয়ে থাকে।
Actual এবং Formal Argument ভিন্ন ভিন্ন Memory Location এ তৈরি হয় ।	Actual এবং Formal Argument একই Memory Location এ তৈরি হয়।
ভেরিয়েবলের মান কে একটি সরল পদ্ধতি ব্যবহার করে পাস করা হয়	ভেরিয়েবলের ঠিকানা (Address of Variable)সঞ্চয় করতে পয়েন্টার এর প্রয়োজন হয় ।
int main() { int x = 10; printf("before calling=%d",x); increment(x); printf("After calling=%d",x); getch(); } void increment(int a) { a = a + 1; printf("value is=%d",a); }	int main() { int x = 10; printf("before calling=%d",x); increment(&x); printf("After calling=%d",x); getch(); } void increment(int a) { a = a + 1; printf("value is=%d",a); }

Digital Electronics

Sequential Logic Circuit

What is Sequential Logic Circuit (সিকোয়েন্সিয়াল লজিক সার্কিট কি)?

The sequential Logic Circuit has a memory so output depends on the input. Sequential Logic Circuits use flip-flops as memory elements.

[সিকোয়েন্সিয়াল লজিক সার্কিটের মেমরি রয়েছে তাই আউটপুট ইনপুটের উপর নির্ভর করে। সিকোয়েন্সিয়াল লজিক সার্কিট মেমরি উপাদান হিসাবে ফ্লিপ ফ্লপ ব্যবহার করে ।]

Flip Flop vs Latch

What is Flip Flop (Flip flop কাকে বলে )?

A flip flop is an electronic circuit which two states. A flip flop is used to store 1-bit binary data. [ফ্লিপ ফ্লপ হল একটি electronic circuit যার দুটি অবস্থা বর্তমান । একটি ফ্লিপ ফ্লপ 1 বিট বাইনারি তথ্য সঞ্চয় করতে ব্যবহৃত হয় ।

What is Latch (Latch কাকে বলে )?

The latch is also an electronics device that has two states and used to store 1-bit binary data. Latch has no clock connection and it is level triggered.[Latch ও flip flop এর ন্যায় একটি electronic circuit যার দুটি অবস্থা বর্তমান ।Latch ও 1 বিট বাইনারি তথ্য সঞ্চয় করতে ব্যবহৃত হয় কিন্তু ল্যাচ(Latch) ফ্লিপ ফ্লপ (Flip flop)এর ন্যায় কোন clock signal প্রদান করা হয় না এবং ইহা clock pulse এর Level Triggered এ কাজ করে। নিম্নলিখিত ভিডিও তে আর ও বিস্তারিত আলোচনা করা হয়েছে। ]

S-R FlipFlop কাকে বলে ?

নিম্নলিখিত ভিডিও র মাধ্যমে S-R flip flop সম্পূর্ণ ব্যাখা দেওয়া হয়েছে।

D(Data or Delay)-FlipFlop

নিম্নলিখিত ভিডিও র মাধ্যমে D flip flop এর সম্পূর্ণ ব্যাখা দেওয়া হয়েছে। D flip flop কে কেন data বা delay ফ্লিপফ্লপ বলা হয়ে থাকে সে বিষয়ে ও আলোকপাত করা হয়েছে।

J-K-FlipFlop

নিম্নলিখিত ভিডিও র মাধ্যমে J-K flip flop এর সম্পূর্ণ ব্যাখা দেওয়া হয়েছে।

Register, Clock Pulse, and Trigger

নিম্নলিখিত ভিডিও র মাধ্যমে Register,Clock Pulse and Trigger এর সম্পূর্ণ ব্যাখা দেওয়া হয়েছে।

নিম্নলিখিত ভিডিও র মাধ্যমে গুরুত্বপূর্ন কয়েকটি Register -এর সম্পূর্ণ ব্যাখা দেওয়া হয়েছে।

1. SISO(Serial In Serial Out) ভিডিও এবং Note

2. SIPO(Serial In Parallel Out) ভিডিও

3. PISO(Parallel In Serial Out) ভিডিও

4. PIPO(Parallel In Parallel Out) ভিডিও

Counter In Digital Electronics: Asynchronous Counter

Object Oriented Programming

Year Basis Question and Answer Of C++

[2015]

1) Do the Following Task using C++ language in OOP

a) Design a Class having Name Circle

b) Declare an integer data for taking value of radius of that circle and take that input through get input() function

c) Find out the area of circle using another member function

Answer

#include<iostream>

using namespace std;

class circle{

public :

int r;

float area;

void input(){

cout<<"Enter radious of circle:";

cin>>r;

}

void findArea(){

area=3.14*r*r;

}

void display(){

cout<<"Area of circle is:";

cout<<area;

}

};

int main(){

circle obj;

obj.input();

obj.findArea();

obj.display();

}

[2016]

a) Write a program in C++ that accepts two number as input and find the sum using class and object

Answer:

#include<iostream>

using namespace std;

class Sum_Two_Num{

public :

int a,b,sum;

void inputNumber(){

cout<<"Enter Two Number :";

cin>>a>>b;

}

void findSum() {

sum=a+b;

}

void display() {

cout<<"Sum of two number is:";

cout<<sum;

}

};

int main(){

Sum_Two_Num obj;

obj.inputNumber();

obj.findSum();

obj.display();

}

b) What is Polymorphism? Explain with example

Answer:

polymorphism is an important concept of object-oriented programming.it means having many forms. Inheritance lets us inherit attributes and methods from another class. Polymorphism uses those methods to perform different tasks. This allows us to perform a single action in different ways.

Example:

class MotorBike {

public:

void speed() {

cout << "This is Hero's speed \n" ;

}

};

// Derived class

class Honda : public MotorBike {

public:

void speed() {

cout << "This is Honda's speed \n" ;

}

};

// Derived class

class Enfield : public MotorBike {

public:

void speed() {

cout << "This is Enfield's speed\n" ;

}

};

[2017]

a) Write a program in C++ to check an integer whether it is odd or even using class and object?

Answer:

#include<iostream>

using namespace std;

class Odd_Even {

int num;

public:

void input() {

cout << "Enter a number:";

cin>>num;

}

void Check_OddEven() {

if (num % 2 == 0) {

cout << "Number is even:" << num;

} else {

cout << "Number is odd:" << num;

}

};

int main() {

Odd_Even obj;

obj.input();

obj.Check_OddEven();

return 0;

}

b) What do you mean by Data Member? Give example?

Data Members are variable which are declared in any class by using any fundamental data types

(like int, char, float etc) or derived data type (like class, structure, pointer etc.).

There are two types of data member

1) Private 2) Public

Example:

class DataMember {

private:

int x;

float a;

public:

int m;

float n;

};

a) Give the difference between public and private member of the class in C++

Answer:

Public	Private
1. All the class members and functions are available to everyone.	1.The class members can be accessed only by the functions inside the class.
2. The public member can be accessed from anywhere in the program using the dot operator(.)with the object of that class.	2.the member functions or the friend functions are allowed to access the private data members of a class
Example: class Subtraction { public: int a,b; int calculate(){ return (a-b); } }; int main(){ Substraction obj; // accessing public data member outside class obj.a=20; obj.b=10; cout<<"Substraction is: " << obj.calculate(); return 0; }	Example: class Subtraction { private: int a,b; private: void calculate(int x,int y){ a=x; b=x; int result=a-b; cout<<"Substraction is="<<result; } }; int main(){ Substration obj; obj.calculate(20,10); return 0; }

b) Describe the characteristic of destructor in C++

Answer:

The destructor has the same name as that of the class prefixed by the tilde character ‘~’.
The destructor cannot have parameters.
It has no return type
there can be only one destructor in a class
The destructor is executed automatically when the control reaches the end of the class scope to destroy the object

c) What do you mean by "get from" Operator in C++? Give example?

Ans: Extraction Operator (>>) sometimes known as "get from" operator which is usually used for input data from the user.

[2018]

a) Write a program in C++ using class and object to check an integer whether is a prime number or not.

Answer:

using namespace std;

int main()

{

int n, i,check=0;

cout << "Enter the Number to check Prime: ";

cin >> n;

for(i = 2; i <=n/2; i++) {

if(n % i == 0)

{

cout<<"Number is not Prime."<<endl;

check=1;

break;

}

if (Check==1) {

cout << "Number is Prime."<<endl;

return 0;

}

b) What is the member function? Give example?

A member function of a class is a function that has its definition or its prototype within or outside the class. member function knows as a method also.

There are two way to define a function

1) inside the class-defined directly

2) outside of the class- using scope resolution operator(::) along with class name

Example:

// Member functions defined within class

class Circle {

public:

double r=2.5; // variable

double getArea(void) {

return 3.14*r*r;

}};

//OR Member functions defined outside of the class

class Circle {

public:

double r=2.5; // variable

};

class Circle::double getArea(void) {

return 3.14*r*r;

}

int main(){

Circle obj;

cout<<"Area of Circle:"<<obj.double getArea();

}

a) Write a program in C++ to find out the factorial of a given integer (N!= 1x2x3x........N)

Answer:

using namespace std;

class FindFactorial {

public:

int factorial(int N) {

int i, f = 1;

for (i = 1; i <= N; i++) {

f = f*i;

}

return f;

}

};

int main() {

FindFactorial obj;

int N;

cout << "Enter a number:";

cin >> N;

cout << "Factorial is:" << obj.factorial(N);

return 0;

}

b) How a member function can be declared outside of the class? Give example?

Anwser:

A member function can be declared outside of the class using the scope resolution operator (::) along with the class name.

Example:

class Circle {

public:

double r=2.5; // variable

};

class Circle::double getArea(void) {

return 3.14*r*r;

}

int main(){

Circle obj;

cout<<"Area of Circle:"<<obj.double getArea();

}

[2019]

a) Write a program in C++ using class and object to find out the sum 1 to N where N is an integer given as input.

Answer:

#include<iostream>

using namespace std;

class Sum_Of_N_Num{

public :

int N,i,sum=0;

void inputNumber(){

cout<<"Enter Number :";

cin>>N;

}

void findSum()

{

for(i=0; i<=N; i++){

sum=sum+i;

}

void display()

{

cout<<"Sum of N number is:";

cout<<sum;

}

};

int main(){

Sum_Of_N_Num obj;

obj.inputNumber();

obj.findSum();

obj.display();

}

b)Write a function of setw and endl manipulator.

Answer:

endl

This manipulator has the same functionality as ‘\n’(newline character). But this also flushes the output stream.

setw()

This manipulator declare in imanip.h . it changes the width of the output field. When used in an expression out << setw(n)output field.

Example:

#include<iostream>

#include<iomanip>

using namespace std;

int main(){

cout<<"USING setw() ..............\n";

cout<< setw(10) <<11<<endl;

cout<< setw(10) <<2222<<endl;

cout<< setw(10) <<33333<<endl;

cout<< setw(10) <<4<<endl;

}

a) Write a program in C++ to print the reverse of given number.

Answer:

#include <iostream>

using namespace std;

int main() {

int num, revNum = 0, rem;

cout << "Enter an integer: ";

cin >> num;

while(num!= 0) {

rem = num%10;

num /= 10;

revNum = revNum*10 + rem;

}

cout << "Reversed Number = " << revNum;

return 0;

}

b) what do you mean by reference variable? Give example?

Answer:

When a variable is declared as a reference, it becomes an alternative name for an existing variable. A variable can be declared as a reference by putting '&' in the declaration.

Example:

#include<iostream>

using namespace std;

int main(){

int x=10;

int& ref=x;

//value of x is now changed

ref=20;

cout<<"x="<<x<<endl;

//value of ref is now changed

x=30;

cout<<"ref="<<ref<<endl;

return 0;

}

Page Submission Validation

Image Changing Effect

image এর উপর মাউস রাখার সাথে সাথে কিভাবে তার পাশে Image টি display হয় তার source code টি নিম্নে উল্লেখ করা হল-

<========================================================>

CSS source Code

body{

Dynamic Memory Allocation এবং FILE Operation and Pointer in C Program

Call by Value এবং Call by Reference ব্যাখ্যা কর ।

Digital Electronics

Sequential Logic Circuit

What is Sequential Logic Circuit (সিকোয়েন্সিয়াল লজিক সার্কিট কি)?

Flip Flop vs Latch

What is Flip Flop (Flip flop কাকে বলে )?

What is Latch (Latch কাকে বলে )?

S-R FlipFlop কাকে বলে ?

D(Data or Delay)-FlipFlop

J-K-FlipFlop

Register, Clock Pulse, and Trigger

নিম্নলিখিত ভিডিও র মাধ্যমে গুরুত্বপূর্ন কয়েকটি Register -এর সম্পূর্ণ ব্যাখা দেওয়া হয়েছে।

Counter In Digital Electronics: Asynchronous Counter

Object Oriented Programming

Year Basis Question and Answer Of C++

:: Manas Halder ::

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