Full Source code

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#include< iostream .h>
#include< conio .h>
 
void main()
{
  int num, rem, sum = 0, temp;
  clrscr();
 
  cout< <"Enter a number\n";
  cin>>num;
 
  temp = num;
 
  while( num )
  {
    rem = num % 10;
    num = num / 10;
    sum = sum * 10 + rem;
  }
 
cout< <"\nReversed Number: "<<sum<<endl;
 
  if( temp == sum )
   cout<<temp<<" is a palindrome";
  else
   cout<<temp<<" in NOT a palindrome";
 
  getch();
}

In this program we assign variable sum = 0 to avoid garbage values in sum before the calculation, which would result in wrong output.
We store the user entered value in temp, so that we can compare it with the final result, to determine whether the given number is palindrome or not.

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 while( num )
  {
    rem = num % 10;
    num = num / 10;
    sum = sum * 10 + rem;
  }

Here the loop executes until the value of num is zero.

If user enters 301, we apply the modulus to get the individual values.
Ex:
301 % 10 = 1
30 % 10 = 0
3 % 10 = 3

We get 301, 30 and 3 by dividing the original value by 10.
Ex:
301 user entered value.
301 / 10 = 30
30 / 10 = 3

Now the sum.

sum = sum * 10 + rem;

1 = 0 * 10 + 1
10 = 1 * 10 + 0
103 = 10 * 10 + 3

So the reverse of 301 is 103, which is not a palindrome.

Video Tutorial: Reverse Given Number And Check For Palindrome: C++

Output:
Enter a number
301
Reversed Number: 103
301 in NOT a palindrome

Related posts:

1. Array Basics in C++ : Find Sum
2. Find the Factorial of a Number: C++
3. Addition of 2 Numbers: C++

Array is a collection of homogeneous data items.

Full Source Code

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#include<iostream .h>
#include<conio .h>
 
void main()
{
  //  int a[5] = { 1, 3, 2, 4, 5 }; declaration with initialization
 
  int a[5], sum = 0;
  clrscr();
 
  cout< <"Enter 5 numbers\n";
  for(int i=0; i&lt;5; i++)
   cin>>a[i];
 
  cout< <"Input array is..\n";
  for(i=0; i&lt;5; i++)
  {
   cout<<a[i]<<endl;
   sum = sum + a[i];  // sum += a[i];
  }
  cout<<"Sum of array elements: "<<sum;
 
  getch();
 
}

In this program we take input from the user and display the user entered numbers and find the sum of all the array elements and display it as well.

Elements are stored from the index number 0. i.e., if the array size is 5, the values will be stored in a[0], a[1], a[2], a[3], a[4];

Ex:
int a[5] = { 1, 3, 2, 4, 5 }; declaration with initialization
float a[5] = { 1.1, 2.0, 3.3, 1.3, 5.6 };

Video Tutorial: Array Basics in C++ : Find Sum

Output:
Enter 5 numbers
1
2
3
4
5
Input array is..
1
2
3
4
5
Sum of array elements: 15

Related posts:

1. Addition of 2 Numbers: C++
2. Find Biggest of 3 Numbers: C++
3. Find the Factorial of a Number: C++

Full Source Code

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#include<iostream .h>
#include<conio .h>
 
void main()
{
  int fact = 1, N;
  clrscr();
 
  cout< <endl<<"Enter a number\n";
  cin>>N;
 
  for( int i=1; i< =N; i++ )
   fact = fact * i;  // OR fact *= i;
 
  cout<<endl<<endl<<"Factorial of "<<N<<" is "<<fact;
 
  getch();
}

Here the for loop stars from 1 and not 0. As anything multiplied by 0 would also be zero.

fact *= i; is the compact representation of fact = fact * i;

Video Tutorial: Factorial in cpp

Output:
Enter a number
5
Factorial of 5 is 120

Related posts:

1. Find Biggest of 3 Numbers: C++
2. Find Biggest of 2 Numbers: C++
3. Addition of 2 Numbers: C++

Before watching this video, please make sure to watch and understand this short video: Find Biggest of 3 Numbers: C++

Full Source Code

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#include<iostream .h>
#include<conio .h>
 
void main()
{
	int a, b, c;
	clrscr();
 
	cout< <"Enter 3 no's\n";
	cin>>a>>b>>c;
 
	int big =  ( a>b && a>c )?a:(b>c?b:c);
	/*
	if( a > b && a > c )
	  big = a;
	else if( b > c )
	  big = b;
	else
	  big = c;
	*/
	cout< <"\nAmong "<<a<<" , "<<b<<" , "<<c<<" Biggest is "<<big;
	getch();
}

In this program we take 3 integer values from the user and using ternary operator decide the biggest of 3 numbers.

	int big =  ( a>b && a>c )?a:(b>c?b:c);

if ( a > b && a > c ) is true, then value of a will be stored in variable big; else ( b > c ? b : c ) will be evaluated. Here, if value of b is greater than c, value of b will be stored in variable big else value of c will be stored in the variable big.

Video Tutorial: Biggest of 3 Integer Numbers

Output
Enter 3 no’s
10
20
30
Among 10, 20, 30 Biggest is 30

Related posts:

1. Biggest of Two Numbers Using Ternary Operator: C++
2. Find Biggest of 3 Numbers: C++
3. Find Biggest of 2 Numbers: C++

Full Source Code

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#include<iostream .h>
#include<conio .h>
 
void main()
{
	int a, b, c;
	clrscr();
 
	cout< <"Enter 3 no\n";
	cin>>a>>b>>c;
 
	int big;
 
	if( a > b )
	 big = a;
	else
	{
	 if( b > c )
	  big = b;
	 else
	  big = c;
	}
	cout< <"\nBiggest is: "<<big;
	getch();
}

In this program we get three integer variables from the user.
If value of variable a is bigger, then we store it inside the variable big; else we compare b with c. Now will store the biggest number inside the variable big.
Video Tutorial: Biggest of 3 Integer Numbers

Output
Enter 3 no’s
404
501
301
Biggest is: 501

Related posts:

1. Find Biggest of 2 Numbers: C++
2. Biggest of Two Numbers Using Ternary Operator: C++
3. Addition of 2 Numbers: C++

To find biggest of Two numbers using if-else control structure: Find Biggest of 2 Numbers: C++

Full Source Code

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#include<iostream .h>
#include<conio .h>
 
void main()
{
 int a, b;
 clrscr();
 
 cout< <"Enter 2 numbers\n";
 cin>>a>>b;
 
 int big;
 
 big = a > b ? a : b;
 
/*
 if( a > b )
  big = a;
 else
  big = b;
*/
 
 cout< <"\nBig is: "<<big;
 
 getch();
}

In this program we take 2 integer values from the user and using ternary operator decide the biggest of 2 numbers.

	 big = a > b ? a : b;

if ( a > b ) is true, then value of a will be stored in variable big; else value of b will be stored in big.

Video Tutorial: Biggest of 2 Integer Numbers Using Ternary Operator

Output
Enter 3 no’s
404
302
Big is: 404

Related posts:

1. Find Biggest of 2 Numbers: C++
2. Addition of 2 Numbers: C++
3. Object Oriented Programming: C++

Full Source Code

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#include<iostream .h>
#include<conio .h>
 
void main()
{
	int a, b;
	clrscr();
 
	cout< <"Enter 2 numbers\n";
	cin>>a>>b;
 
	int big;
 
	if( a > b )
	 big = a;
	else
	 big = b;
 
	cout< <endl<<"Among "<<a<<" and "<<b<<" biggest is "<<big;
 
	getch();
}

In this program we get two integer variables from the user.
If value of variable a is bigger, then we store it inside the variable big; else we store the value of variable b inside variable big.
Finally display the value of variable big which contains the biggest number amongst the two values entered by the user.

Video Tutorial: Biggest of 2 Integer Numbers

Output
Enter 2 numbers
-100
0
Among -100 and 0 biggest is 0

Related posts:

1. Addition of 2 Numbers: C++
2. Object Oriented Programming: C++
3. Simple Interest: C Program

Full Source Code

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#include<iostream .h>
#include<conio .h>
 
void main()
{
 
 int a, b;
 clrscr();
 
 cout< <"Enter two no\n";
 cin>>a>>b;
 
 int sum = a + b;
 
 cout< <endl<<"Sum is: "<<sum;
 
 getch();
 
}

We can declare variables anywhere in a cpp program.

Video Tutorial: Addition of 2 Integer Numbers

In this program we take input from the user, add it and then echo the result back to the screen.

Output
Enter two no
100
200

Sum is: 300

Related posts:

1. Using Constructors & Member Function to add two numbers: Java
2. Object Oriented Programming: C++
3. Simple Interest: C Program

Sample C Program:

#include<stdio.h>

void main()
{
  printf("Welcome To C");
}

Here stdio.h header file is included inorder to make use of printf and scanf functions.

Sample Cpp Program:

#include<iostream.h>

void main()
{
  cout<<"Welcome To Cpp";
}

Here iostream.h header file is included inorder to make use of cout and cin objects.

cout is an object of class ostream.
cin is an object of class istream.

Both these ostream and istream classes are present inside iostream.h file.

In both C and C++, execution of the program starts from main() function.

The difference is, printf and scanf are functions; while cout and cin are objects.

<< is called Insertion Operator. To show result on output window.
>> is called Extraction Operator. To get input from the user(keyboard).

Structures In C:

struct Student
{
  String name[];
  int age;
}s1;

To access members of structure:

s1.name[];
s1.age;

Video Tutorial: Basics of C++

Class In Cpp:

#include<iostream.h>
#include<conio.h>

class Student
{
  int a, b, c;

  public:
  void read() { cin>>a>>b>>c; }
  void show() { cout<<"\nEntered Numbers are "<<a<<" , "<<b<<" , "<<c; }
};

int main()
{
  A a;
  clrscr();

  cout<<"\nEnter 3 nums\n";

  a.read();
  a.show();

  getch();

}

member functions are accessed with the help of objects.

object.member

This way data binding is done and a level of security is imparted to the data.

Binding of Data and method into a single unit is called ENCAPSULATION.

Related posts:

1. First Java Program: Basic
2. Event Object: Javascript
3. Using Constructors & Member Function to add two numbers: Java

Video Tutorial: Colorful Text Output: C program

Full Source code: Colorful Text Output: C program C

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#include< stdio.h> /* Leave No space b/w < and stdio.h */
 
void main()
{
	int i;
	clrscr();
 
	for( i=0; i<=15; i++ )
	{
		textcolor(i);
		cprintf("Microsoft, Google, Yahoo, Oracle, eBay, PayPal \r\n");
	}
 
	getch();
 
}

textcolor() function takes color code as it’s parameter, and this color is taken by cprintf() function and the parameter(string) passed to cprintf is printed in the color given by textcolor() function.

OutPut:
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal
Microsoft, Google, Yahoo, Oracle, eBay, PayPal

Related posts:

1. Simple Interest: C Program
2. Write Data To Text File In C: Character by Character
3. First Java Program: Basic

  #include< stdio.h>

is the only header file required to include.

DOSBOX
I’m using a software called DOSBOX to write my c program. Using this software we can run 32-bit programs on our 62-bit machine.
I’m mounting my C:/DOSFOLDER here. So C:/DOSFOLDER will be treated as my C drive.

Here is the DOS code to do that:

z:\> mount c "c:/DOSFOLDER"
z:\>c:
c:\>cd TC
c\TC:>tc

We take a pointer variable of FILE type, so that this variable can be used to further reference to the file.

FILE *p;
char ch;

ch is a char type variable to store user entered characters and to transfer it to the file.

  p = fopen("c:\\Hello.txt","w");

fopen function takes two parameters. First one being the path of the file(if the file doesn’t exist, it creates one by itself), second parameter indicates the write mode. i.e., the file is opened in write mode and is intended for the write operation.

Note: If you are using DOSBOX software, then the file will be created at this location c:/DOSFOLDER/Hello.txt

       clrscr();
 
        printf("\nEnter the text nd hit Enter to Terminate\n");

clrscr() clears the screen and the print statement asks the user to enter some text and hit enter to terminate.

while( (ch=getche()) !='\r' )
	fputc( ch,p);

getche() is a function that gets a character from the keyboard, echoes to screen.
These characters are stored in char variable ch. If the entered character is not “Enter Key” that is \r charriage return character, then the control enters the while loop and using fputc function it transfers the content(character) present in ch to p(variable which references the file we have opened for writing).

fclose(p);

closes the file, opened for write operation.

Video Tutorial: Creating and Writing Data To A Simple File: in C

Full Source code to Creating and Writing Data To A Simple File: in C

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#include< stdio.h> /* no space b/w < and stdio.h */
 
void main()
{
	FILE *p;
	char ch;
 
	p = fopen("c:\Hello.txt","w");
	clrscr();
 
	printf("\nEnter the text nd hit Enter to Terminate\n");
 
	while( (ch = getche()) != '\r' )
	 fputc( ch, p );
 
	fclose(p);
}

Output:
Recruitment’s in C.

Related posts:

1. Insert And Extract/Fetch Data From Database: PHP Script
2. Text Stacking: CSS & JavaScript
3. Simple Interest: C Program

import javax.swing.*;

javax.swing provides a set of lightweight components that, to the maximum degree possible, works the same on all platforms.

myWindow Class

class myWindow extends JFrame
{
 
}

myWindow is user the name given to the defined class. extends is the keyword. JFrame is a built-in class of swing package.

Constructor

 myWindow()
 { 
		setTitle("My window program, using Swings");
		setSize(400, 200);
		setVisible( true );
		setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
 }

myWindow() is the constructor, and thus it’s name matches with that of its class name.
setTitle() : To set the string present on the title bar of the window we are creating.
setSize() : To set the size of the window. It takes two parameters, width and height of the window.
setVisible() : It’s very important for all the programs which involves visual components. passing a value of true makes the window visible.

Main method

	public static void main(String args[])
	{
		 // new myWindow();
		myWindow m1 = new myWindow();
	}

main method just calls the constructor. We can simply write new myWindow() since we are not at all taking the help of any object here.

Video Tutorial: Creating Simple Window in Java: using swings

Full Source code to create a simple window in Java: using swings

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import javax.swing.*;
 
class myWindow extends JFrame
{
	myWindow()
	{
		setTitle("My window program, using Swings");
		setSize(400, 200);
		setVisible( true );
		setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
	}
 
	public static void main(String args[])
	{
		 // new myWindow();
		myWindow m1 = new myWindow();
	}
}

Output:

Related posts:

1. Addition/Subtraction of Complex Number: Java
2. First Java Program: Basic
3. Using Constructors & Member Function to add two numbers: Java