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This is a function that will add positive integer numbers together of almost any length. (in fact up to the maximum string length that php can handle)
This gets around the 'rounding off' that many program languages carry out once a number reaches a certain size.
Note though that both the numbers to be added together must be positive.
Note also that the returned answer will be a string and not a number, so bear that in mind if you intend to use this in conjunction with other functions/procedures.
Keep an eye out for my next submissions as they will be 'big_subtract' , 'big_divide' , and 'big_multiply'. Carrying out subtraction, division and multiplication of very large integers.
Sums two positive numbers together. Note that the two numbers involved
must both be positive
| <?php
$number_one = "457736563527579860946";
$number_two = "244899980006764545657";
$answer = big_addition ($number_one, $number_two);
print $answer;
function big_addition ($number_one, $number_two) {
$carry = 0;
if (strlen($number_one) > strlen($number_two)) {
$longer_length = strlen($number_one);
$shorter_length = strlen($number_two);
$set_one = $number_one;
$zero_number = ($longer_length - $shorter_length);
$zero_string = "";
for ( $index = 1; $index <= $zero_number; $index++ ) {
$zero_string = $zero_string . "0";
}
$set_two = $zero_string . $number_two;
$length = strlen($number_one);
}
if (strlen($number_one) < strlen($number_two)) {
$longer_length = strlen($number_two);
$shorter_length = strlen($number_one);
$set_two = $number_two;
$zero_number = ($longer_length - $shorter_length);
$zero_string = "";
for ( $index = 1; $index <= $zero_number; $index++ ) {
$zero_string = $zero_string . "0";
}
$set_one = $zero_string . $number_one;
$length = strlen($number_two);
}
if (strlen($number_one) == strlen($number_two)) {
$set_one = $number_one;
$set_two = $number_two;
$length = strlen($number_one);
}
$answer = "";
for ( $index = ($length - 1); $index >= 0; $index-- ) {
$digit = $carry + (( integer ) $set_one[$index]) + (( integer ) $set_two[$index]);
$digit_string = (( string ) $digit);
if ($digit >= 10) {
$answer = $answer . $digit_string[1];
$carry = ( integer ) $digit_string[0];
}
else {
$answer = $answer . $digit_string;
$carry = 0;
}
}
if ($carry != 0) {
$carry_string = (( string ) $carry);
$answer = $answer . $carry_string;
}
$answer = strrev($answer);
return $answer;
}
?> | |
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