Welcome back to **shortlearner.com**, in this post we will see how to write a program to find first and last digit of a number without using any type of loop.

so in the below program we are declaring a php variable $n which will takes the number.

here we are defining 2 php functions which will returns the first and last digit of our $n number.

the first function is **firstNumber **which will accept $n as a parameter than we use log10() function.

now we will take an short overview of log10() function. basically log10() is a mathematical function which is defined in math.h header file and it returns log base 10 value of the passed paramater.

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than we use** pow()** function. so basically pow() is a predefined function which will return the first number to the power of second number. in other words we can say that it compute power of a certain number. this function takes 2 parameter which are the base and exponent and returns the desired answer.

after using pow() function we will get** first digit **of our $n number. now we will declare our second function **lastNumer** which will help us to find out the last digit of $n number.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | <?php function firstNumber($n) { // Find total number of digits - 1 $digits = (int)log10($n); // Find first digit $n = (int)($n / pow(10, $digits)); // Return first digit return $n; } // Find the last digit function lastNumer($n) { // return the last digit return ($n % 10); } // Define numer $n = 58727; echo firstNumber($n) , " ", lastNumer($n), "\n"; // our out put is 5 and 7. ?> |

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