ScotlandPHP

bcadd

(PHP 4, PHP 5, PHP 7)

bcaddİki keyfi duyarlıklı sayıyı toplar

Açıklama

string bcadd ( string $sol_terim , string $sag_terim [, int $olcek ] )

sol_terim ile sag_terim toplamını alır.

Değiştirgeler

sol_terim

Dizge olarak sol terim.

sag_terim

Dizge olarak sağ terim.

bölüntü

Bu seçimlik değiştirge ondalık iminin sağında kaç hane gösterileceğini belirler. Bunu betik genelinde geçerli olacak şekilde atamak için bcscale() işlevini kullanın.

Dönen Değerler

İki terimin toplamını dizge olarak verir.

Örnekler

Örnek 1 bcadd() örneği

<?php

$a 
'1.234';
$b '5';

echo 
bcadd($a$b);     // 6
echo bcadd($a$b4);  // 6.2340

?>

Ayrıca Bakınız

  • bcsub() - Keyfi duyarlıklı sayılar arasında çıkartma işlemi yapar

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User Contributed Notes 2 notes

up
20
Nitrogen
8 years ago
I made this to add an unlimited size of numbers together..

This could be useful for those without the BCMath extension.

It allows decimals, and optional $Scale parameter.  If $Scale isn't specified, then it'll automatically adjust to show the correct number of decimals.

<?php

function Add($Num1,$Num2,$Scale=null) {
 
// check if they're valid positive numbers, extract the whole numbers and decimals
 
if(!preg_match("/^\+?(\d+)(\.\d+)?$/",$Num1,$Tmp1)||
     !
preg_match("/^\+?(\d+)(\.\d+)?$/",$Num2,$Tmp2)) return('0');

 
// this is where the result is stored
 
$Output=array();

 
// remove ending zeroes from decimals and remove point
 
$Dec1=isset($Tmp1[2])?rtrim(substr($Tmp1[2],1),'0'):'';
 
$Dec2=isset($Tmp2[2])?rtrim(substr($Tmp2[2],1),'0'):'';

 
// calculate the longest length of decimals
 
$DLen=max(strlen($Dec1),strlen($Dec2));

 
// if $Scale is null, automatically set it to the amount of decimal places for accuracy
 
if($Scale==null) $Scale=$DLen;

 
// remove leading zeroes and reverse the whole numbers, then append padded decimals on the end
 
$Num1=strrev(ltrim($Tmp1[1],'0').str_pad($Dec1,$DLen,'0'));
 
$Num2=strrev(ltrim($Tmp2[1],'0').str_pad($Dec2,$DLen,'0'));

 
// calculate the longest length we need to process
 
$MLen=max(strlen($Num1),strlen($Num2));

 
// pad the two numbers so they are of equal length (both equal to $MLen)
 
$Num1=str_pad($Num1,$MLen,'0');
 
$Num2=str_pad($Num2,$MLen,'0');

 
// process each digit, keep the ones, carry the tens (remainders)
 
for($i=0;$i<$MLen;$i++) {
   
$Sum=((int)$Num1{$i}+(int)$Num2{$i});
    if(isset(
$Output[$i])) $Sum+=$Output[$i];
   
$Output[$i]=$Sum%10;
    if(
$Sum>9) $Output[$i+1]=1;
  }

 
// convert the array to string and reverse it
 
$Output=strrev(implode($Output));

 
// substring the decimal digits from the result, pad if necessary (if $Scale > amount of actual decimals)
  // next, since actual zero values can cause a problem with the substring values, if so, just simply give '0'
  // next, append the decimal value, if $Scale is defined, and return result
 
$Decimal=str_pad(substr($Output,-$DLen,$Scale),$Scale,'0');
 
$Output=(($MLen-$DLen<1)?'0':substr($Output,0,-$DLen));
 
$Output.=(($Scale>0)?".{$Decimal}":'');
  return(
$Output);
}

$A="5650175242.508133742";
$B="308437806.831153821478770";

printf("  Add(%s,%s);\r\n// %s\r\n\r\n",$A,$BAdd($A,$B));
printf("BCAdd(%s,%s);\r\n// %s\r\n\r\n",$A,$B,BCAdd($A,$B));

/*
  This will produce the following..
    Add(5650175242.508133742,308437806.831153821478770);
  // 5958613049.33928756347877

  BCAdd(5650175242.508133742,308437806.831153821478770);
  // 5958613049
*/

?>

It was a fun experience making, and thought I'd share it.
Enjoy,
Nitrogen.
up
7
Bo Anders Svensson
12 years ago
Be aware:

$exp1 = "1E5";
$exp2 = "2E4";

$ans1 = bcadd((float)$exp1, (float)$exp2, 3);
$ans2 = bcadd((int)$exp1, (int)$exp2, 3);
$ans3 = bcadd($exp1, $exp2, 3);

echo "1: $exp1 + $exp2 = $ans1\r\n";
echo "2: $exp1 + $exp2 = $ans2\r\n";
echo "3: $exp1 + $exp2 = $ans3\r\n";

1: 1E5 + 2E4 = 120000.000
2: 1E5 + 2E4 = 3.000
3: 1E5 + 2E4 = 0.000
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