Computer Science Programming Tutorials

In Java

Simple Java GUI Calculator

August 28, 2014 1 Min Read

Simple Java GUI Calculator that performs basic mathematical calculations (addition, subtraction, multiplication and divide). In addition, it can calculate the…

In Java

Solutions to Deitel’s Java How to Program (10th Edition) Exercises

August 25, 2014 2 Mins Read

Below are links to the solutions to Deitel’s Java How to Program (9th Edition) exercises that have been posted so…

In Java

Print Numbers on Screen Using Java

August 25, 2014 1 Min Read

The program below print numbers on the screen using Java. It is the solution to Deitel’s Java How to Program…

In Pascal

3×3 Matrix Multiplication Using Pascal Programming

August 20, 2014 1 Min Read

The program below computes the product of two 3 by 3 matrices using the Pascal programming language.


PROGRAM matrix (Input, Output);
VAR
  A, B, C: ARRAY[1..3, 1..3] OF Integer;
  Arow, AColumn, Brow, BColumn, I, J, K, SUM: Integer;
BEGIN
  Write(' ':4O, 'MATRIX MULTIPLICATION PROGRAM');
  Write(' ':4O, '-----------------------------');
  Writeln;}
  Writeln(' Enter the number of ROWS of Matrix A');
  Readln(Arow);
  Writeln(' Enter the number of COLUMNS of Matrix A');
  Readln(AColumn);
  Writeln(' Enter the number of ROWS of Matrix B');
  Readln(Brow);
  Writeln(' Enter the number of COLUMNS of Matrix B');
  Readln(BColumn);
  Writeln();
  IF (AColumn = Brow) THEN
    BEGIN
      Writeln(' Enter the elements of Matrix A');
      For I:= 1 to 3 DO
        For J:= 1 TO 3 DO
          Readln(A[I,J]);
      Writeln(' Enter the elements of Matrix B');
      For I:= 1 to 3 DO
        For J:= 1 TO 3 DO<
          Readln(B[I,J]);
      Writeln;
{ Display the elements of Matrix A }
    Writeln(' MATRIX A');
    Writeln(' --------');
    For I:= 1 TO 3 DO
      BEGIN
        For J:= 1 TO 3 DO
          Write(A[I,J]:3);
          Writeln;
      END;
    Writeln;
{ Display the elements of Matrix B }
    Writeln(' MATRIX B');
    Writeln(' --------');
    For I:= 1 TO 3 DO
      BEGIN
        For J:= 1 TO 3 DO
          Write(B[I,J]:3);
          Writeln;
      END;
    Writeln;
{ Compute the Product of Matrices A and B }
    For I:= 1 to 3 DO
      For J:= 1 TO 3 DO
        BEGIN
          SUM:=0;
          For K:= 1 TO 3 DO
          SUM:= SUM + A[I,K] * B[K,J];
          C[I,J]:= SUM;
        END;
    Writeln;
{ Display the Product of Matrices A and B }
    Writeln(' MATRIX AB');
    Writeln(' ---------');
    Writeln;
    For I:= 1 TO 3 DO
      BEGIN
        For J:= 1 TO 3 DO
        Write(C[I,J]:5);
        Writeln;
      END;
    END
  ELSE
  Writeln(' Matrix A and B cannot be multiplied. Enter Matrices in the order m x n and n x p');
  Writeln();
  Writeln(' PRESS THE ENTER KEY TO EXIT');
  Readln;
END.

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PROGRAM matrix (Input, Output);

VAR

A, B, C: ARRAY[1..3, 1..3] OF Integer;

Arow, AColumn, Brow, BColumn, I, J, K, SUM: Integer;

BEGIN

Write(' ':4O, 'MATRIX MULTIPLICATION PROGRAM');

Write(' ':4O, '-----------------------------');

Writeln;}

Writeln(' Enter the number of ROWS of Matrix A');

Readln(Arow);

Writeln(' Enter the number of COLUMNS of Matrix A');

Readln(AColumn);

Writeln(' Enter the number of ROWS of Matrix B');

Readln(Brow);

Writeln(' Enter the number of COLUMNS of Matrix B');

Readln(BColumn);

Writeln();

IF (AColumn = Brow) THEN

BEGIN

Writeln(' Enter the elements of Matrix A');

For I:= 1 to 3 DO

For J:= 1 TO 3 DO

Readln(A[I,J]);

Writeln(' Enter the elements of Matrix B');

For I:= 1 to 3 DO

For J:= 1 TO 3 DO<

Readln(B[I,J]);

Writeln;

{ Display the elements of Matrix A }

Writeln(' MATRIX A');

Writeln(' --------');

For I:= 1 TO 3 DO

BEGIN

For J:= 1 TO 3 DO

Write(A[I,J]:3);

Writeln;

END;

Writeln;

{ Display the elements of Matrix B }

Writeln(' MATRIX B');

Writeln(' --------');

For I:= 1 TO 3 DO

BEGIN

For J:= 1 TO 3 DO

Write(B[I,J]:3);

Writeln;

END;

Writeln;

{ Compute the Product of Matrices A and B }

For I:= 1 to 3 DO

For J:= 1 TO 3 DO

BEGIN

SUM:=0;

For K:= 1 TO 3 DO

SUM:= SUM + A[I,K] * B[K,J];

C[I,J]:= SUM;

END;

Writeln;

{ Display the Product of Matrices A and B }

Writeln(' MATRIX AB');

Writeln(' ---------');

Writeln;

For I:= 1 TO 3 DO

BEGIN

For J:= 1 TO 3 DO

Write(C[I,J]:5);

Writeln;

END;

END

ELSE

Writeln(' Matrix A and B cannot be multiplied. Enter Matrices in the order m x n and n x p');

Writeln();

Writeln(' PRESS THE ENTER KEY TO EXIT');

Readln;

END.

You can modify the…

In Java

Java Hello World Program

August 12, 2014 1 Min Read

This is a simple Hello World java program to display the words “Hello World!!!” on the screen.


public class HelloWorld { 
  public static void main(String args[]) { 
    System.out.println("Hello World!!!"); 
  } 
}

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public class HelloWorld {

public static void main(String args[]) {

System.out.println("Hello World!!!");

}