Computer Science Programming Tutorials
In C

C Program to Add Two Numbers

1 Min Read

A simple C program to add two integer numbers.

Simple C Addition Program
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#include <stdio.h>
 
int main (void) {
  int x, y, z;
 
  x = 5;
  y = 52;
  z = x + y;
 
  printf("\n\nx = 5 \ny = 52 \n");
  printf("z = x + y = %d", z);
  
  return 0;
}

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checkerboard pattern of asterisks
In Java

Java Program: Checkerboard Pattern of Asterisks

1 Min Read

Question: Write an application that displays a checkerboard pattern, as follows:

CheckerboardPatternOfAsterisks.java
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public class CheckerboardPatternOfAsterisks {
    public static void main (String [ ] args) {
        
        System.out.print("********\n ********\n********\n ********\n"
                + "********\n ********\n********\n ********\n");
 
    }
}

Note that this program can also be written using eight System.out.println…

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3x3 Matrix multiplication Program
In Pascal

3×3 Matrix Multiplication Using Pascal Programming

1 Min Read

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

3x3 Matrix Program in Pascal
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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…

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In Java

Java Hello World Program

1 Min Read

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

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

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