Question

Using PHP: Write a function that: Given a numerical parameter in input, computes and prints all...

Using PHP:

  1. Write a function that:
  • Given a numerical parameter in input, computes and prints all the prime numbers up to that value.

Example:

If input parameter is 10, output is "2, 3, 5, 7"

If input parameter is 100, output is "2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97"

  1. Write a "tester function" that:
  • Given a specific subset of inputs, tests the function described above (point 1).

Example, in pseudo code:

tester_function:   
   is output from prime_function(10) equal to "2, 3, 5, 7"? If yes, test passed
   is output from prime_function(0) equal to ""? If yes, test passed
   ...
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Homework Answers

Answer #1

1.

Required Function:

<?php

//Define the function.

function print_prime($num)

{

//Check for valid input.

if ($num <= 1)

{

echo "no possible primes are present upto number ".$num;

}

else

{

//Create the array to store the prime number.

$prime_array = array_fill(0, $num+1, true);

//Iterate from 2 to entered number.

for ($i = 2; $i*$i <= $num; $i++)

{

//Check for the prime number and print it.

if ($prime_array[$i] == true)

{

for ($j = $i*$i; $j <= $num; $j += $i)

$prime_array[$j] = false;

}

}

for ($i = 2; $i <= $num; $i++)

if ($prime_array[$i])

echo $i." ";

}

}

?>

Sample Implementation:

Screenshot of the Code:

index.php:

prime.php:

Sample Output:

Code to Copy:

index.php:

<html>

<head>

<title>Prime Number Function</title>

</head>

<body>

<form action ="prime.php" method = "post">

Enter the number: <input type ="text" name = "number">

<input type="submit">

<br>

</body>

</html>

prime.php:

<html>

<body>

<?php

//Define the function.

function print_prime($num)

{

//Check for valid input.

if ($num <= 1)

{

echo "no possible primes are present upto number ".$num;

}

else

{

//Create the array to store the prime number.

$prime_array = array_fill(0, $num+1, true);

//Iterate from 2 to entered number.

for ($i = 2; $i*$i <= $num; $i++)

{

//Check for the prime number and print it.

if ($prime_array[$i] == true)

{

for ($j = $i*$i; $j <= $num; $j += $i)

$prime_array[$j] = false;

}

}

for ($i = 2; $i <= $num; $i++)

if ($prime_array[$i])

echo $i." ";

}

}

//Get the input from the form created

//in index.php page.

$n = (int)$_POST["number"];

//Function call.

print_prime($n);

?>

</body>

</html>

2.

Required Function:

<?php

//Define the tester function

function tester_function()

{

//Get the input from the form created

//in index.php page.

$input = 10;

//Display the message

echo "prime numbers upto given number " .$input." are : "." ";

//call the prime function to print the prime numbers.

print_prime($input);

}

//Call the tester function.

tester_function();

?>

Sample Implementation:

Screenshot of the Code:

index.php:

prime.php:

Sample Output:

Code to Copy:

index.php:

<html>

<head>

<title>Prime Number Function</title>

</head>

<body>

<form action ="prime.php" method = "post">

Enter the number: <input type ="text" name = "number">

<input type="submit">

<br>

</body>

</html>

prime.php:

<html>

<body>

<?php

//Define the function.

function print_prime($num)

{

//Check for valid input.

if ($num <= 1)

{ echo "no possible primes are present upto number ".$num;

}

else

{

//Create the array to store the prime number.

$prime_array = array_fill(0, $num+1, true);

//Iterate from 2 to entered number.

for ($i = 2; $i*$i <= $num; $i++)

{

//Check for the prime number and print it.

if ($prime_array[$i] == true)

{

for ($j = $i*$i; $j <= $num; $j += $i)

$prime_array[$j] = false;

}

}

for ($i = 2; $i <= $num; $i++)

if ($prime_array[$i])

echo $i." ";

}

}

//Define the tester function

function tester_function()

{

//Get the input from the form created

//in index.php page.

$input = (int)$_POST["number"];

//Display the message

echo "prime numbers upto given number " .$input." are : "." ";

//call the prime function to print the prime numbers.

print_prime($input);

}

//Call the tester function.

tester_function();

?>

</body>

</html>

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