<?php
= "999999999999999999999999999999999999999999999999999999999999999999" ;
$number_two = "999999999999999999999999999999999999999999999999999999999999999" ;
$answer = big_subtract ( $number_one , $number_two );
$answer ;
big_subtract ( $number_one , $number_two ) {
$answer = "" ;
$sign = "" ;
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 = "" ;
$index = 1 ; $index <= $zero_number ; $index ++ ) {
$zero_string = $zero_string . "0" ;
$set_two = $zero_string . $number_two ;
$length = strlen ( $number_one );
$sign = "" ;
strlen ( $number_one ) < strlen ( $number_two )) {
$longer_length = strlen ( $number_two );
$shorter_length = strlen ( $number_one );
$set_one = $number_two ;
$zero_number = ( $longer_length - $shorter_length );
$zero_string = "" ;
$index = 1 ; $index <= $zero_number ; $index ++ ) {
$zero_string = $zero_string . "0" ;
$set_two = $zero_string . $number_one ;
$length = strlen ( $number_two );
$sign = "-" ;
strlen ( $number_one ) == strlen ( $number_two )) {
$length = strlen ( $number_one );
$flag = 0 ;
$index = 0 ;
$flag == 0 ) && ( $index <= ( $length - 1 ))) {
$number_one [ $index ]) > (( integer ) $number_two [ $index ])) {
$set_one = $number_one ;
$set_two = $number_two ;
$sign = "" ;
$flag = 1 ;
$number_one [ $index ]) < (( integer ) $number_two [ $index ])) {
$set_one = $number_two ;
$set_two = $number_one ;
$sign = "-" ;
$flag = 1 ;
$number_one [ $index ]) == (( integer ) $number_two [ $index ])) {
$index ++;
strlen ( $number_one ) == strlen ( $number_two )) {
$flag = 0 ;
$index = 0 ; $index <= ( $length - 1 ); $index ++ ) {
$number_one [ $index ] != $number_two [ $index ]) {
$flag = 1 ;
$flag == 0 ) {
$answer = 0 ;
$answer ;
$carry = 0 ;
$answer = "" ;
$index = ( $length - 1 ); $index >= 0 ; $index -- ) {
$digit = $carry + (( integer ) $set_one [ $index ]) - (( integer ) $set_two [ $index ]);
$digit < 0 ) {
$digit = $digit + 10 ;
$carry = - 1 ;
$answer = $answer . (( string ) $digit );
$answer = $answer . (( string ) $digit );
$carry = 0 ;
$answer = strrev ( $answer );
$flag = 0 ;
$length = strlen ( $answer );
$index = 0 ;
$flag == 0 ) && ( $index <= ( $length - 1 ))) {
$answer [ $index ] != "0" ) {
$flag = 1 ;
$index ++;
$begin = $index - 1 ;
$result = "" ;
$index = $begin ; $index <= ( $length - 1 ); $index ++ ) {
$result = $result . $answer [ $index ];
$answer = $sign . $result ;
$answer ;
?>
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