Author: admin

Square Number Pattern in Java: 1

In this tutorial, we will go through the square number pattern program in java. Before that, you may go through the following topic in java.

for loop in java

Number Square Pattern Programs in Java

The programs below take the user input for the number of rows to be displayed in the pattern. We have used a for loop to iterate.

Pattern 1:

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, i, j;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the no. of rows: ");
    rows = sc.nextInt();

    for (i = 1; i <= rows; i++)
    {
      for (j = 1; j < i; j++)
        System.out.print("0 ");

      System.out.print(i + " ");

      for (j = i; j < rows; j++)
        System.out.print("0 ");

      System.out.println();
    }
  }
}

Output:

Enter the no. of rows: 5 1 0 0 0 0 0 2 0 0 0 0 0 3 0 0 0 0 0 4 0 0 0 0 0 5

3 October 2021

2 Different Alphabet Patterns in Java (sideways triangle)

In this tutorial, we will go through two different alphabet pattern programs in java programming. Before that, you may go through the following topic in java.

for loop in java

2 different Alphabet pattern program in Java

Both of the programs below take the number of rows as the user input and using for loop it prints the desired output.

The patterns include the sideways triangle or the pyramid with different alphabet patterns, also the half hourglass patterns containing different patterns.

Pattern 1:

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, i, j;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the no. of rows: ");
    rows = sc.nextInt();

    for (i = 0; i <= rows; i++)
    {
      int ch = 65;
      for (j = 0; j <= i; j++)
        System.out.print((char)(ch + j) + " ");

      System.out.println();
    }
    for (i = rows; i >= 0; i--)
    {
      int ch = 65;
      for (j = 0; j <= i - 1; j++)
        System.out.print((char)(ch + j) + " ");

      System.out.println();
    }
  }
}

Output:

Enter the no. of rows: 5 A A B A B C A B C D A B C D E A B C D E F A B C D E A B C D A B C A B A

Pattern 2:

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, i, j;
    int character = 65;
    int count = 1;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the no. of rows: ");
    rows = sc.nextInt();

    for (i = 1; i <= rows / 2 + 1; i++)
    {
      for (j = 1; j <= i; j++)
        System.out.print((char)(character + (count *j) - 1) + " ");

      System.out.println();
      count++;
    }

    for (i = 1; i <= rows / 2; i++)
    {
      for (j = 1; j <= rows / 2 + 1 - i; j++)
        System.out.print((char)(character + (count *j) - 1) + " ");

      System.out.println();
      count++;
    }
  }
}

Output:

Enter the no. of rows: 9 A B D C F I D H L P E J O T Y F L R X G N U H P I

3 October 2021

Alphabet Pattern Programs in Java (Diamond Shape)

In this tutorial, we will go through different alphabet patterns in java. Before that, you may go through the following topic in java.

for loop in java

Both of the programs below take the user input for the number of rows to be printed for the alphabet pattern in java for the diamond shape.

Alphabet diamond pattern in java

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, i, j, k;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the no. of rows: ");
    rows = sc.nextInt();

    System.out.print("Diamond Shape Pattern: \n\n");
    for (i = 0; i <= rows; i++)
    {
      int ch = 65;
      for (j = rows; j >= i; j--)
      {
        System.out.print(" ");
      }
      for (k = 0; k <= i; k++)
      {
        System.out.print((char)(ch + k) + " ");
      }
      System.out.println();
    }

    for (i = 0; i <= rows; i++)
    {
      int ch = 65;
      for (j = -1; j <= i; j++)
      {
        System.out.print(" ");
      }
      for (k = 0; k <= (rows - 1) - i; k++)
      {
        System.out.print((char)(ch + k) + " ");
      }
      System.out.println();
    }
  }
}

Output:

Hollow Diamond Alphabet Pattern in java

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, i, j;
    int ch = 65;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the no. of rows: ");
    rows = sc.nextInt();

    System.out.print("Diamond Shape Pattern: \n\n");

    //Upper part of diamond
    for (i = 1; i <= rows; i++)
    {
      for (j = rows; j > i; j--)
        System.out.print(" ");

      System.out.print((char) ch++);

      for (j = 1; j < (i - 1) *2; j++)
        System.out.print(" ");

      if (i == 1)
        System.out.print("\n");
      else
        System.out.print((char) ch++ + "\n");
    }

    //lower part of diamond
    ch = 65;
    for (i = rows - 1; i >= 1; i--)
    {
      for (j = rows; j > i; j--)
        System.out.print(" ");

      System.out.print((char) ch++);

      for (j = 1; j < (i - 1) *2; j++)
        System.out.print(" ");

      if (i == 1)
        System.out.print("\n");
      else
        System.out.print((char) ch++ + "\n");
    }
  }
}

Output:

3 October 2021

Java Program to print Hollow Rectangle or Square star patterns

In this tutorial, we will write a program to display a hollow pattern of stars in java. We will write code for two different shapes patterns. Before that, you may go through the following topic in java.

for loop in java

Hollow rectangle star pattern in java

The program takes a user input for the number of rows and columns for the hollow rectangle. Then using two for loops it will print the star rectangular pattern in java.

Example:

Inputs:
      Rows: 6
      Columns:10
Output:
**********
*        *
*        *
*        *
*        *
**********

Java Program to print Hollow Rectangle Star Pattern.

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, columns, i, j;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the no. of rows: ");
    rows = sc.nextInt();
    System.out.print("Enter the no. of columns: ");
    columns = sc.nextInt();

    System.out.print("Rectangular star Pattern: \n\n");
    for (i = 1; i <= rows; i++)
    {
      for (j = 1; j <= columns; j++)
      {
        if (i == 1 || i == rows || j == 1 || j == columns)
          System.out.print("*");
        else
          System.out.print(" ");
      }

      System.out.println();
    }
  }
}

Output:

Hollow square star pattern in java

As the square contains only sides and both length and breadth are equal so the program only takes user input for a number of rows and prints the same number of rows and columns.

Example:

Inputs:
   Rows: 7
Output:
*******
*     *
*     *
*     *
*     *
*     *
*******

Java program to print hollow square pattern of stars

import java.util.Scanner;

public class Main
{
  public static void main(String[] args)
  {
    int rows, i, j;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the number of rows: ");
    rows = sc.nextInt();

    for (i = 1; i <= rows; i++)
    {
      for (j = 1; j <= rows; j++)
      {
        if (i == 1 || i == rows ||
          j == 1 || j == rows)
          System.out.print("*");
        else
          System.out.print(" ");
      }
      System.out.println();
    }
  }
}

Output:

2 October 2021

Hollow Diamond Pattern in Java

In this tutorial, we will write a program to print a hollow diamond star pattern in java. We will go through two examples. Before that, you may go through the following topic in java.

for loop in java
while loop in java

The program takes a user input for the number of rows for the hollow pattern using the Scanner class. We will use a for loop to iterate and print the pattern.

The user can give the input number as they wish and get the hollow diamond star pattern according to their input provided.

Java Program To Display Hollow Diamond Star Pattern

import java.util.Scanner;

public class Main
{
  public static void main(String[] args)
  {
    int rows, i, j;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the number of rows: ");
    rows = sc.nextInt();

    //Upper part of diamond
    for (i = 1; i <= rows; i++)
    {
      for (j = rows; j > i; j--)
        System.out.print(" ");

      System.out.print("*");

      for (j = 1; j < (i - 1) *2; j++)
        System.out.print(" ");

      if (i == 1)
        System.out.print("\n");
      else
        System.out.print("*\n");
    }

    //lower part of diamond
    for (i = rows - 1; i >= 1; i--)
    {
      for (j = rows; j > i; j--)
        System.out.print(" ");

      System.out.print("*");

      for (j = 1; j < (i - 1) *2; j++)
        System.out.print(" ");

      if (i == 1)
        System.out.print("\n");
      else
        System.out.print("*\n");
    }
  }
}

Output:

Print Hollow Diamond Pattern using Star in Java using while loop

The program below takes the rows input from the user as the above program did but here we will produce a hollow diamond pattern using a while loop instead of for loop.

import java.util.Scanner;

public class Main
{
  public static void main(String[] args)
  {
    int rows, i, j;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the number of rows: ");
    rows = sc.nextInt();

    //Upper part of diamond
    i = 1;
    while (i <= rows)
    {
      j = rows;
      while (j > i)
      {
        System.out.print(" ");
        j--;
      }
      System.out.print("*");

      j = 1;
      while (j < (i - 1) *2)
      {
        System.out.print(" ");
        j++;
      }

      if (i == 1)
        System.out.print("\n");
      else
        System.out.print("*\n");

      i++;
    }

    //lower part of diamond
    i = rows - 1;
    while (i >= 1)
    {
      j = rows;
      while (j > i)
      {
        System.out.print(" ");
        j--;
      }

      System.out.print("*");

      j = 1;
      while (j < (i - 1) *2)
      {
        System.out.print(" ");
        j++;
      }

      if (i == 1)
        System.out.print("\n");
      else
        System.out.print("*\n");

      i--;
    }
  }
}

The above program with a while loop will produce the same result as the for loop has produced. The only difference is we used while instead of for loop.

1 October 2021

Block Diagram of a Computer
Computer Block Diagram: Block diagram of computer displays the structural or pictorial representation of a computer system. In other words, a block diagram of the computer will let you visualize how the computer works starting from inputting the data to retrieving the output.

The following is the block diagram of computer system.

The Computer System works with the combination of the following three components.
- Input Unit
- Central Processing Unit
  - ALU – Arithmetic Logic Unit
  - CU – Control Unit
- Memory Unit
  - Primary memory
  - Secondary memory
- Output Unit
Explain block diagram of a computer

Input Unit

The input units are the input devices attached to a system through which the users enter the instruction for the computer to perform. These devices are the mouse, keyboard, scanner, etc. We can say that these devices are the means of communication between the user and the system.

The computer takes the input as the raw data that is the binary (machine-readable form) and performs the further processing. Later, when the processing is complete, it gives the output in output devices such as through monitors, printers, etc.

Central Processing Unit (CPU)

The CPU is the brain/heart of the computer. The computer is nothing without the CPU. All the instruction that is given by the user to the computer is processed by the CPU. The CPU gets the input from the user or the set of instructions and produces the output accordingly.

It is an electronic hardware device that performs all the operations such as arithmetic and logical operations. It is responsible for activation and controlling the operation of other units.

Block diagram of CPU:

It consists of two major components and they are:
- Arithmetic and Logic Unit (ALU)
- Control Unit (CU)
Arithmetic and Logic Unit (ALU):

In this part of the CPU, all the arithmetical and logical operations are performed.

The arithmetic operations such as addition, subtraction, multiplication, and division are performed in the arithmetic section, and the logical operation such as AND, OR, Equal, Less than, Greate than, etc are performed on the logical section. Logical is also responsible for comparing, matching, selecting, etc operations.

Control Unit (CU):

From the name itself, we can conclude that the control unit (CU) controls all the activities or operations which are performed inside the computer system.

As you can see in the diagram above the control unit is connected to the memory unit of the system that means it receives instructions or information directly from the main memory of the computer. The control unit converts those instructions into a set of signals and then transmits those signals to the other part of the computer system for further processing.

Memory Unit

The memory unit is one of the major components of a computer system or component of a digital computer that is also called a storage unit. The data and instructions are stored in a memory unit for further after and before processing. The intermediate and final results are stored in this unit.

The instructions are transmitted to different parts of the system from the memory unit. There are two types of memory units and they are:

Primary Storage Unit:

The primary memory stores the temporary data or instruction. They cannot store a huge amount of data. It is used to store the instruction that is currently being performed or the immediate calculation result. Once the power to the computer is cut off, the data in this primary will be lost.

It is also known as the Main memory or the Temporary memory. One example of this type of memory is RAM(Random Access Memory).

Secondary Storage Unit:

When we need to store the data permanently for future processing then we use the secondary memory of the computer. It is exactly the opposite of primary memory. The data is not lost even if the power supply fails.

It is also called secondary or auxiliary storage or permanent storage. One example of this type of memory is a Hard Disk or an SSD (Solid-state drive).

Note: The CPU can directly access the primary memory but the secondary memory is not accessible to the CPU directly. The data from the secondary memory is first loaded to the RAM (primary memory) and then the CPU can access it.

Output Unit

The output units are the output devices attached to a system through which the users can see the result of the inputted data. These devices are printers, monitors, etc.

The data is first stored in the memory and then converted to human-readable form from binary code and then displayed on the output devices.

The output unit provides the result into two forms such as soft copy or hard copy. The monitor is used for a soft copy as it displays on the screen, whereas the printer is used for hard copy as it prints the output on the paper.
30 September 2021

Right Arrow Star Pattern in Java

In this tutorial, we will write a java program to print right arrow star pattern. Before that, you may go through the following topic in java.

for loop in java

Right Arrow Star Pattern in Java

This is a program on the arrowhead pattern in java. The program takes a user input for the number of rows in a pattern and using for loop, it displays the pattern.

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, i, j, k;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the number of rows: ");
    rows = sc.nextInt();

    System.out.print("Output:\n");

    //upper part of the arrow head
    for (i = 1; i < rows; i++)
    {
      for (j = 0; j < i; j++)
        System.out.print(" ");

      for (k = 0; k < i; k++)
        System.out.print("*");

      System.out.println();
    }

    //lower part of the arrow head
    for (i = 0; i < rows; i++)
    {
      for (j = 0; j < rows - i; j++)
        System.out.print(" ");

      for (k = 0; k < rows - i; k++)
        System.out.print("*");

      System.out.println();
    }
  }
}

Output:

User Input for Character

import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, i, j, k;
    char symbol;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the number of rows: ");
    rows = sc.nextInt();
    System.out.print("Enter the symbol for the pattern: ");
    symbol = sc.next().charAt(0);

    System.out.print("Output:\n");

    //upper part of the arrow head
    for (i = 1; i < rows; i++)
    {
      for (j = 0; j < i; j++)
        System.out.print(" ");

      for (k = 0; k < i; k++)
        System.out.print(symbol);

      System.out.println();
    }

    //lower part of the arrow head
    for (i = 0; i < rows; i++)
    {
      for (j = 0; j < rows - i; j++)
        System.out.print(" ");

      for (k = 0; k < rows - i; k++)
        System.out.print(symbol);

      System.out.println();
    }
  }
}

Output:

29 September 2021

Right Angle Triangle Character Pattern in Java: Pattern 1
In this tutorial, we will write a program to display a right-angle triangle pattern in java using the alphabet. Before that, you may go through the following topic in java.
- for loop in java
The program below takes the user input from the user for the number of rows and display the right triangle character pattern in various character orders.

Right angled triangle pattern
```
import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, i, j;
    int ch = 64;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the number of rows: ");
    rows = sc.nextInt();

    System.out.print("Output:\n");
    for (i = 1; i <= rows; i++)
    {
      for (j = 1; j <= i; j++)
        System.out.print((char)(i + ch)+" ");

      System.out.println();
    }
  }
}
```
Output:

Enter the number of rows: 6 Output: A B B C C C D D D D E E E E E F F F F F F
29 September 2021
Inverted Right Triangle Alphabet Pattern in Java: Pattern 1
In this tutorial, we will write a java program to display the reverse right triangle pattern using the alphabet. These are character pattern programs in java. Before that, you may go through the following topic in java.
- for loop in java
The programs below take the user input from the user for the number of rows and display the reverse right triangle character pattern in various character orders.

This program can also be called the inverted half pyramid in java or Floyd’s triangle alphabet pattern in java.

Reverse right angled triangle pattern

In this program, the decrement of the Alphabet starts from the right corner of the pattern.
```
import java.util.Scanner;

public class Main
{
  public static void main(String args[])
  {
    int rows, i, j;
    int ch = 64;
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the number of rows: ");
    rows = sc.nextInt();

    System.out.print("Output:\n\n");
    for (i = rows; i >= 1; i--)
    {
      for (j = 1; j <= i; j++)
      {
        System.out.print((char)(j + ch));
      }

      System.out.println();
    }
  }
}
```
Output:

Enter the number of rows: 6 Output:
ABCDEF ABCDE ABCD ABC AB A
29 September 2021

Inverted Hourglass Pattern in Java using Numbers

In this tutorial, we will write a java program to print the inverted hourglass pattern using numbers. Before that, you may go through the following topic in java.

for loop in java

Inverted Hourglass Pattern in Java

import java.util.Scanner;

public class Main
{
  public static void main(String[] args)
  {
    Scanner sc = new Scanner(System.in);

    System.out.print("Enter the number of rows: ");
    int n = sc.nextInt();
    int nsp = 2 *n - 1;

    int nr = 2 *n + 1;
    int num = n;
    int a = 0;

    for (int i = 1; i <= nr; i++)
    {
      if (i > n + 1)
        a = nr - i + 1;
      else
        a = i;

      //numbers
      for (int cst = 1; cst <= a; cst++)
      {
        System.out.print(num);
        num--;
      }

      //Spaces
      for (int csp = 1; csp <= nsp; csp++)
      {
        System.out.print(" ");
      }

      for (int cst = 1; cst <= a; cst++)
      {
        num++;
        if (num != 0)
          System.out.print(num);
      }

      if (i <= (nr) / 2)
        nsp -= 2;
      else
        nsp += 2;

      System.out.println();
    }
  }
}

Output:

29 September 2021

Author: admin

Number Square Pattern Programs in Java

Pattern 1:

2 different Alphabet pattern program in Java

Pattern 1:

Pattern 2:

Alphabet diamond pattern in java

Hollow Diamond Alphabet Pattern in java

Hollow rectangle star pattern in java

Hollow square star pattern in java

Java Program To Display Hollow Diamond Star Pattern

Print Hollow Diamond Pattern using Star in Java using while loop

Input Unit

Central Processing Unit (CPU)

Memory Unit

Output Unit

Right Arrow Star Pattern in Java

User Input for Character

Right angled triangle pattern

Reverse right angled triangle pattern

Inverted Hourglass Pattern in Java