কম্পিউটার প্রোগ্রামিং এর প্রাণ হলো তার এলগোরিদম (Algorithm) । আপনার এলগোরিদম যদি সঠিক হয় তবে আপনি প্রোগ্রামটিকে যে কোনো ল্যাঙ্গুয়েজে লিখলেই প্রবলেম সলভড হবে । সেই জন্য সবার আগে আপনার এলগোরিদম নিখুঁত হতে হবে । একটি প্রোগ্রামের এলগোরিদম হলো কোনো প্রব্লেম সলভের জন্য এক গুচ্ছ স্টেপ বাই স্টেপ কর্মপদ্ধতি । তাই সবার আগে এলগোরিদম, তারপরে কোডিং । কোডিং তুলনামূলক সহজ, যে কোনো কোডার দিয়েই করিয়ে নেওয়া যাবে যদি আপনার কাছে এলগোরিদম থাকে । কাজটা অনেকটা ধরুন এক ইঞ্জিনিয়ার একটি ব্রিজের নিখুঁত নকশা করলেন, এখানে নকশা টা হলো ব্রিজের এলগোরিদম, আর কোডার হলো ঠিকাদার থেকে নির্মাণ শ্রমিকদল । সেই জন্য আসল ক্রেডিট প্রাপ্য ওই ইঞ্জিনিয়ার এর ।

আমি একটা ছোট্ট প্রোগ্রাম লিখবো চারটি ভিন্ন ভিন্ন প্রোগ্রামিং ল্যাঙ্গুয়েজে, একটি মাত্র এলগোরিদম ব্যবহার করে । তো চলুন শুরু করা যাক -

P_^roblem:

# Write a program to find out maximum and minimum number from given four integer numbers

A_^lgorithm:

1. Store 4 integer numbers in 4 variables (respectively a,b,c,d)
2. Starting for finding out maximum number
3. Compare a & b.
4. If a is greater than b then assume maximum number is a. Else, assume maximum number is b.
5. Compare assumed maximum number & c.
6. If assumed maximum number is greater than c then no action is needed. Else, assume maximum number is c.
7. Compare assumed maximum number & d.
8. If assumed maximum number is greater than d then no action is needed; assumed maximum number is the real maximum number. Else, maximum number is d.
9. Starting for finding out minimum number
10. Compare a & b.
11. If a is less than b then assume minimum number is a. Else, assume minimum number is b.
12. Compare assumed minimum number & c.
13. If assumed minimum number is less than c then no action is needed. Else, assume minimum number is c.
14. Compare assumed minimum number & d.
15. If assumed minimum number is less than d then no action is needed; assumed minimum number is the real minimum number . Else, minimum number is d.

প্রোগ্রাম এলগোরিদম তো পেয়ে গেলাম এই বার জাস্ট কোডিংয়ের পালা, সব চাইতে সহজ কাজ । উপরের এলগিরদম ব্যবহার করে প্রোগ্রামটিকে চারটি ভিন্ন ভিন্ন ল্যাঙ্গুয়েজে নিচে লিখলাম -

Problem Solving Using Above Algorithm - Coding in C Language

    /*This program demonstrates how to find out maximum and minimum number from given four integer numbers using conditional statement if() in C language. */

//Programmed by Phantom @rme

#include <stdio.h> //header file link standard Input & Output (I/O)


int main() //main function
{
    int number1, number2, number3, number4; //local variable declaration
    int maximum, minimum;
    
    // assign values to all integer variables
    number1 = 595; 
    number2 = 643;
    number3 = 1006;
    number4 = 56;
    
    //find out maximum number
    if(number1>number2) 
      {
          maximum = number1;
      }
    else
      {
          maximum = number2;
      }
      
    if(maximum<number3)
      {
          maximum = number3;
      }
      
    if(maximum<number4)
      {
          maximum = number4;
      }
    
    //print the maximum number on the computer screen
    printf("Maximum number is %d in the given numbers %d, %d, %d, %d\n",maximum,number1,number2,number3,number4);
    
    //find out minimum number
    if(number1<number2) 
      {
          minimum = number1;
      }
    else
      {
          minimum = number2;
      }
      
    if(minimum>number3)
      {
          minimum = number3;
      }
      
    if(minimum>number4)
      {
          minimum = number4;
      }
    
    //print the minimum number on the computer screen
    printf("Minimum number is %d in the given numbers %d, %d, %d, %d",minimum,number1,number2,number3,number4);
    
    
    return 0; //program executed successfully
} //End of program

Output

    Maximum number is 1006 in the given numbers 595, 643, 1006, 56
    Minimum number is 56 in the given numbers 595, 643, 1006, 56

Problem Solving Using Above Algorithm - Coding in C++ Language

    /*This program demonstrates how to find out maximum and minimum number from given four integer numbers using conditional statement if() in C++ language */
    
//6530
//590
//28640
//32
    
    //Programmed by Phantom @rme

#include <iostream> // include standard input output (I/O) stream

using namespace std;

int main() //main function
{
    int number1, number2, number3, number4; //local variable declaration
    int maximum, minimum;
    
    // assign values to all integer variables
        number1 = 6530; 
        number2 = 590;
        number3 = 28640;
        number4 = 32;
        
     //find out maximum number
        if(number1 > number2) 
          {
              maximum = number1;
          }
        else
          {
              maximum = number2;
          }
          
        if(maximum < number3)
          {
              maximum = number3;
          }
          
        if(maximum < number4)
          {
              maximum = number4;
          }
          
    //print the maximum number on the computer screen
        cout << "Maximum number is " << maximum << " in the given numbers " << number1 << " " << number2 << " " << number3 << " " << number4 << endl;
    
       //find out minimum number
        if(number1 < number2) 
          {
              minimum = number1;
          }
        else
          {
              minimum = number2;
          }
          
        if(minimum > number3)
          {
              minimum = number3;
          }
          
        if(minimum > number4)
          {
              minimum = number4;
          }
        
        //print the minimum number on the computer screen
        cout << "Minimum number is " << minimum << " in the given numbers " << number1 << " " << number2 << " " << number3 << " " << number4 << endl;
   
   return 0; //program executed successfully
} //End of program

Output

Maximum number is 28640 in the given numbers 6530 590 28640 32
Minimum number is 32 in the given numbers 6530 590 28640 32

Problem Solving Using Above Algorithm - Coding in PHP Language

<!DOCTYPE html>
<!This program demonstrates how to find out maximum and minimum number from given four integer numbers using conditional statement if() in PHP language. >
<html>
<body>

<?php //PHP code staring from here

///Programmed by Phantom @rme

$number1; $number2; $number3; $number4; //variable declaration
$maximum; $minimum;

// assign values to all variables
$number1 = 45;
$number2 = 239;
$number3 = 32;
$number4 = 168;

//find out maximum number
    if($number1 > $number2) 
      {
          $maximum = $number1;
      }
    else
      {
          $maximum = $number2;
      }
      
    if($maximum < $number3)
      {
          $maximum = $number3;
      }
      
    if($maximum < $number4)
      {
          $maximum = $number4;
      }

//print the maximum number on the computer screen
    print "Maximum number is " . $maximum . " in the given numbers " . $number1 . " " . $number2 . " " . $number3 . " ". $number4 . "<br>";
    
    
   //find out minimum number
    if($number1 < $number2) 
      {
          $minimum = $number1;
      }
    else
      {
          $minimum = $number2;
      }
      
    if($minimum > $number3)
      {
          $minimum = $number3;
      }
      
    if($minimum > $number4)
      {
          $minimum = $number4;
      }
     
    
//print the minimum number on the computer screen
    print "Minimum number is " . $minimum . " in the given numbers " . $number1 . " " . $number2 . " " . $number3 . " ". $number4;
    
?> //end of php code
 
</body>
</html>

Output

Maximum number is 239 in the given numbers 45 239 32 168  
Minimum number is 32 in the given numbers 45 239 32 168

Problem Solving Using Above Algorithm - Coding in VB.NET Language

Module FindMaxMin
'This program demonstrates how to find out maximum and minimum number from given four integer numbers using conditional statement if() in VB.net language

'Programmed by Phantom

Sub Main() 'main function
Dim numb1, numb2, numb3, numb3 As Integer 'local variable declaration
Dim maximum, minimum As Integer

numb1 = 689 'Assign value to first integer 
numb2 = 56 'Assign value to second integer 
numb3 = 211 'Assign value to third integer
numb4 = 745 'Assign value to third integer

'find out maximum number
If (numb1 > numb2) Then
maximum = numb1
Else
maximum = numb2
End If

If (maximum < numb3) Then
maximum = numb3
End If

If (maximum < numb4) Then
maximum = numb4
End If

'print the maximum number on the computer screen
Console.WriteLine("Maximum number is {0} in the given numbers  {1}, {2}, {3} & {4}", maximum, numb1, numb2, numb3, numb4) 'print the result on the computer screen

'find out minimum number
If (numb1 < numb2) Then
minimum = numb1
Else
minimum = numb2
End If

If (minimum > numb3) Then
minimum = numb3
End If

If (minimum > numb4) Then
minimum = numb4
End If

'print the minimum number on the computer screen
Console.WriteLine("Minimum number is {0} in the given numbers  {1}, {2}, {3} & {4}", minimum, numb1, numb2, numb3, numb4) 'print the result on the computer screen

Console.ReadLine()
End Sub

End Module 'End of program

Output

Maximum number is 745 in the given numbers 689 56 211 745
Minimum number is 56 in the given numbers 689 56 211 745

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