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  • How to Print Floyd's Triangle in php ?

    @indu.gupta
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    Hello readers, today I have taken example of Floyds triangle. Floyd's  triangle is a right-angled triangle of  array having natural numbers. The  natural numbers are printed in such a manner , that it will look like right angle triangle. It is named after Mathematician Robert Floyd. Floyd's  triangle is made by filling the rows of the triangle with consecutive natural numbers, starting with 1 in the top left corner.

     

    Here is the program to print Floyd's triangle

    <html>
<body>


<form method="post" action="index.php">
<label>Enter the number :</label><input type="text" name="number"><br/>
<input type="submit" name="submit">
</form>

<?php
$a=1;
$k=htmlspecialchars($_POST["number"]);
 
for($i=1; $i<=$k; $i++){
 
for($j=1;$j<=$i;$j++){
 
echo $a;
$a++;
}
 
print("<br/>");
}
?>


</body>
</html>

     

     

    Output:

     

    1
    23
    456
    78910
    1112131415
    161718192021
    22232425262728
    2930313233343536
    373839404142434445
    46474849505152535455

     

     

    Comment : In the above example I took an inputbox, in which user entered a number, this number will assign to variable 'k'. Now I have applied for loop which will start from 0, and ends upto variable 'k'(user entered number). Inside for loop, I have used another for loop which will start from 1 and ends at the value of  variable 'i'. Inside this loop I am printing variable 'a' whose starting value is 1 and then incrementing with the for loop.

     

    How to Print Floyd's Triangle in php ?
    php programming floyds triangle
    Comment on it

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