Doing what should be a straight forward calculation in PHP 7. The following never produces a float result. Running var_dump($C) returns int(2)
$A = 0.04;
$B = 0.20;
$C = 3*($A/$B)^2;
echo $C;
I don't need the result to be float type, I need the precision.
I've tried setting the precision using ini_set('precision', n). I've tried the code on three environments and getting the same result. Declaring (float) is also does not work.
What am I doing wrong?
3*($A/$B)^2
Means 3 * (A/B) XOR 2 (^ means xor) so bascially the result you are seeing is the result of a bitwise XOR on the result of your division.
If you want to raise the result to the power 2, you should use the pow() function. You can read about it here: http://php.net/manual/en/function.pow.php .
^ does not calculate the power, but XOR (which casts float to int).
to calculate the power, use pow() or in PHP5.6+ **
<?php
$A = 0.04;
$B = 0.20;
$C = 3*($A/$B)**2;
echo $C; //output: 0.12
You should use pow() instead.
$C = 3 * pow(($A/$B), 2);
var_dump($C); // float(0.12)
try using
<?php
$A = 0.04;
$B = 0.20;
$C = 3 * pow(($A/$B),2);
echo $C; //output: 0.36
Related
To use modular exponentiation as you would require when using the Fermat Primality Test with large numbers (100,000+), it calls for some very large calculations.
When I multiply two large numbers (eg: 62574 and 62574) PHP seems to cast the result to a float. Getting the modulus value of that returns strange values.
$x = 62574 * 62574;
var_dump($x); // float(3915505476) ... correct
var_dump($x % 104659); // int(-72945) ... wtf.
Is there any way to make PHP perform these calculations properly? Alternatively, is there another method for finding modulus values that would work for large numbers?
For some reason, there are two standard libraries in PHP handling the arbitrary length/precision numbers: BC Math and GMP. I personally prefer GMP, as it's fresher and has richer API.
Based on GMP I've implemented Decimal2 class for storing and processing currency amounts (like USD 100.25). A lot of mod calculations there w/o any problems. Tested with very large numbers.
use this
$num1 = "123456789012345678901234567890";
$num2 = "9876543210";
$r = mysql_query("Select #sum:=$num1 + $num2");
$sumR = mysql_fetch_row($r);
$sum = $sumR[0];
have you taken a look at bcmod()? php has issues with integers over 2^31 - 1 on 32 bit platforms.
var_dump(bcmod("$x", '104659') ); // string(4) "2968"
I suggest you try BigInteger. If that doesn't work out, you may use SWIG to add C/C++ code for the big integer calculations and link it into your code.
I wrote a very small code for you that will surely work in case of big numbers-
<?php
$x = gmp_strval(gmp_mul("62574","62574")); // $x="3915505476"
$mod=gmp_strval(gmp_mod($x,"104659")); //$mod="2968"
echo "x : ".$x."<br>";
echo "mod : ".$mod;
/* Output:
x : 3915505476
mod : 2968
*/
?>
You simply have to use strings for storing big numbers and to operate on them use GMP functions in PHP.
You may check some good GMP functions in the official PHP manual here-
http://php.net/manual/en/ref.gmp.php
I found another solution, but the number will be stored as a string. As soon as you cast it back to a numeric, you'll be restricted to the precision of the underlying platform. On a 32 bit platform, the largest int you can represent as an int type is 2,147,483,647:
/**
* #param string $a
* #param string $b
* #return string
*/
function terminal_add($a,$b)
{
exec('echo "'.$a.'+'.$b.'"|bc',$result);
$ret = "";
foreach($result as $line) $ret .= str_replace("\\","",$line);
return $ret;
}
// terminal_add("123456789012345678901234567890", "9876543210")
// output: "123456789012345678911111111100"
$x = 62574 * 62574;
// Cast to an integer
$asInt = intval($x);
var_dump($asInt);
var_dump($asInt % 104659);
// Use use sprintf to convert to integer (%d), which will casts to string
$asIntStr = sprintf('%d', $x);
var_dump($asIntStr);
var_dump($asIntStr % 104659);
<?php
function add($int1,$int2){
$int1 = str_pad($int1, strlen($int2), '0', STR_PAD_LEFT);
$int2 = str_pad($int2, strlen($int1), '0', STR_PAD_LEFT);
$carry = 0;
$str = "";
for($i=strlen($int1);$i>0;$i--){
$var = $int1[$i-1] + $int2[$i-1] + $carry;
$var = str_pad($var, 2, '0', STR_PAD_LEFT);
$var = (string) $var;
$carry = $var[0];
$str = $str . $var[1];
}
$res = strrev($str.$carry);
echo ltrim($res,"0");
}
add($int1,$int2);
?>
To use modular exponentiation as you would require when using the Fermat Primality Test with large numbers (100,000+), it calls for some very large calculations.
When I multiply two large numbers (eg: 62574 and 62574) PHP seems to cast the result to a float. Getting the modulus value of that returns strange values.
$x = 62574 * 62574;
var_dump($x); // float(3915505476) ... correct
var_dump($x % 104659); // int(-72945) ... wtf.
Is there any way to make PHP perform these calculations properly? Alternatively, is there another method for finding modulus values that would work for large numbers?
For some reason, there are two standard libraries in PHP handling the arbitrary length/precision numbers: BC Math and GMP. I personally prefer GMP, as it's fresher and has richer API.
Based on GMP I've implemented Decimal2 class for storing and processing currency amounts (like USD 100.25). A lot of mod calculations there w/o any problems. Tested with very large numbers.
use this
$num1 = "123456789012345678901234567890";
$num2 = "9876543210";
$r = mysql_query("Select #sum:=$num1 + $num2");
$sumR = mysql_fetch_row($r);
$sum = $sumR[0];
have you taken a look at bcmod()? php has issues with integers over 2^31 - 1 on 32 bit platforms.
var_dump(bcmod("$x", '104659') ); // string(4) "2968"
I suggest you try BigInteger. If that doesn't work out, you may use SWIG to add C/C++ code for the big integer calculations and link it into your code.
I wrote a very small code for you that will surely work in case of big numbers-
<?php
$x = gmp_strval(gmp_mul("62574","62574")); // $x="3915505476"
$mod=gmp_strval(gmp_mod($x,"104659")); //$mod="2968"
echo "x : ".$x."<br>";
echo "mod : ".$mod;
/* Output:
x : 3915505476
mod : 2968
*/
?>
You simply have to use strings for storing big numbers and to operate on them use GMP functions in PHP.
You may check some good GMP functions in the official PHP manual here-
http://php.net/manual/en/ref.gmp.php
I found another solution, but the number will be stored as a string. As soon as you cast it back to a numeric, you'll be restricted to the precision of the underlying platform. On a 32 bit platform, the largest int you can represent as an int type is 2,147,483,647:
/**
* #param string $a
* #param string $b
* #return string
*/
function terminal_add($a,$b)
{
exec('echo "'.$a.'+'.$b.'"|bc',$result);
$ret = "";
foreach($result as $line) $ret .= str_replace("\\","",$line);
return $ret;
}
// terminal_add("123456789012345678901234567890", "9876543210")
// output: "123456789012345678911111111100"
$x = 62574 * 62574;
// Cast to an integer
$asInt = intval($x);
var_dump($asInt);
var_dump($asInt % 104659);
// Use use sprintf to convert to integer (%d), which will casts to string
$asIntStr = sprintf('%d', $x);
var_dump($asIntStr);
var_dump($asIntStr % 104659);
<?php
function add($int1,$int2){
$int1 = str_pad($int1, strlen($int2), '0', STR_PAD_LEFT);
$int2 = str_pad($int2, strlen($int1), '0', STR_PAD_LEFT);
$carry = 0;
$str = "";
for($i=strlen($int1);$i>0;$i--){
$var = $int1[$i-1] + $int2[$i-1] + $carry;
$var = str_pad($var, 2, '0', STR_PAD_LEFT);
$var = (string) $var;
$carry = $var[0];
$str = $str . $var[1];
}
$res = strrev($str.$carry);
echo ltrim($res,"0");
}
add($int1,$int2);
?>
I'm having trouble about getting the exact value in PHP.
I have these values :
$a = 22900000.002827;
$b = 0.022900;
$c = $a/$b;
I'm expecting to have a result of 1000000000.12345 but it only return 1000000000.1234
My question is that, is there any way to bypass this limitation in PHP?
PHP's floating point numbers are platform-dependent, however with the proper formatting print and on a 64bit build you should be able to get the desired result:
printf("%.5f", 22900000.002827 / 0.022900);
// on my system, prints: 1000000000.12345
If you want to print "up to 5" decimal places, but with no tailing zeros it they are not needed you can use the g format type:
printf("%.5f", 1/2);
// prints: 0.50000 - this is pretty ugly
printf("%.5g", 1/2);
// prints: 0.5
printf("%.5g", 22900000.002827 / 0.022900);
// prints: 1.0e+9 unfortunately
print rtrim(sprintf("%.5f", 22900000.002827 / 0.022900), "0");
print rtrim(sprintf("%.5f", 1/2), "0");
// prints: 1000000000.12345 and 0.5
you can use bcdiv and supply no of digits what you want after decimal like
<?php
$a = 22900000.002827;
$b = 0.022900;
$c = $a/$b;
echo " c=".$c;
$d = bcdiv("$a", "$b", 5);
echo " d=".$d;
?>
OUTPUT :
c=1000000000.1234
d=1000000000.12344
Demo
To use modular exponentiation as you would require when using the Fermat Primality Test with large numbers (100,000+), it calls for some very large calculations.
When I multiply two large numbers (eg: 62574 and 62574) PHP seems to cast the result to a float. Getting the modulus value of that returns strange values.
$x = 62574 * 62574;
var_dump($x); // float(3915505476) ... correct
var_dump($x % 104659); // int(-72945) ... wtf.
Is there any way to make PHP perform these calculations properly? Alternatively, is there another method for finding modulus values that would work for large numbers?
For some reason, there are two standard libraries in PHP handling the arbitrary length/precision numbers: BC Math and GMP. I personally prefer GMP, as it's fresher and has richer API.
Based on GMP I've implemented Decimal2 class for storing and processing currency amounts (like USD 100.25). A lot of mod calculations there w/o any problems. Tested with very large numbers.
use this
$num1 = "123456789012345678901234567890";
$num2 = "9876543210";
$r = mysql_query("Select #sum:=$num1 + $num2");
$sumR = mysql_fetch_row($r);
$sum = $sumR[0];
have you taken a look at bcmod()? php has issues with integers over 2^31 - 1 on 32 bit platforms.
var_dump(bcmod("$x", '104659') ); // string(4) "2968"
I suggest you try BigInteger. If that doesn't work out, you may use SWIG to add C/C++ code for the big integer calculations and link it into your code.
I wrote a very small code for you that will surely work in case of big numbers-
<?php
$x = gmp_strval(gmp_mul("62574","62574")); // $x="3915505476"
$mod=gmp_strval(gmp_mod($x,"104659")); //$mod="2968"
echo "x : ".$x."<br>";
echo "mod : ".$mod;
/* Output:
x : 3915505476
mod : 2968
*/
?>
You simply have to use strings for storing big numbers and to operate on them use GMP functions in PHP.
You may check some good GMP functions in the official PHP manual here-
http://php.net/manual/en/ref.gmp.php
I found another solution, but the number will be stored as a string. As soon as you cast it back to a numeric, you'll be restricted to the precision of the underlying platform. On a 32 bit platform, the largest int you can represent as an int type is 2,147,483,647:
/**
* #param string $a
* #param string $b
* #return string
*/
function terminal_add($a,$b)
{
exec('echo "'.$a.'+'.$b.'"|bc',$result);
$ret = "";
foreach($result as $line) $ret .= str_replace("\\","",$line);
return $ret;
}
// terminal_add("123456789012345678901234567890", "9876543210")
// output: "123456789012345678911111111100"
$x = 62574 * 62574;
// Cast to an integer
$asInt = intval($x);
var_dump($asInt);
var_dump($asInt % 104659);
// Use use sprintf to convert to integer (%d), which will casts to string
$asIntStr = sprintf('%d', $x);
var_dump($asIntStr);
var_dump($asIntStr % 104659);
<?php
function add($int1,$int2){
$int1 = str_pad($int1, strlen($int2), '0', STR_PAD_LEFT);
$int2 = str_pad($int2, strlen($int1), '0', STR_PAD_LEFT);
$carry = 0;
$str = "";
for($i=strlen($int1);$i>0;$i--){
$var = $int1[$i-1] + $int2[$i-1] + $carry;
$var = str_pad($var, 2, '0', STR_PAD_LEFT);
$var = (string) $var;
$carry = $var[0];
$str = $str . $var[1];
}
$res = strrev($str.$carry);
echo ltrim($res,"0");
}
add($int1,$int2);
?>
To use modular exponentiation as you would require when using the Fermat Primality Test with large numbers (100,000+), it calls for some very large calculations.
When I multiply two large numbers (eg: 62574 and 62574) PHP seems to cast the result to a float. Getting the modulus value of that returns strange values.
$x = 62574 * 62574;
var_dump($x); // float(3915505476) ... correct
var_dump($x % 104659); // int(-72945) ... wtf.
Is there any way to make PHP perform these calculations properly? Alternatively, is there another method for finding modulus values that would work for large numbers?
For some reason, there are two standard libraries in PHP handling the arbitrary length/precision numbers: BC Math and GMP. I personally prefer GMP, as it's fresher and has richer API.
Based on GMP I've implemented Decimal2 class for storing and processing currency amounts (like USD 100.25). A lot of mod calculations there w/o any problems. Tested with very large numbers.
use this
$num1 = "123456789012345678901234567890";
$num2 = "9876543210";
$r = mysql_query("Select #sum:=$num1 + $num2");
$sumR = mysql_fetch_row($r);
$sum = $sumR[0];
have you taken a look at bcmod()? php has issues with integers over 2^31 - 1 on 32 bit platforms.
var_dump(bcmod("$x", '104659') ); // string(4) "2968"
I suggest you try BigInteger. If that doesn't work out, you may use SWIG to add C/C++ code for the big integer calculations and link it into your code.
I wrote a very small code for you that will surely work in case of big numbers-
<?php
$x = gmp_strval(gmp_mul("62574","62574")); // $x="3915505476"
$mod=gmp_strval(gmp_mod($x,"104659")); //$mod="2968"
echo "x : ".$x."<br>";
echo "mod : ".$mod;
/* Output:
x : 3915505476
mod : 2968
*/
?>
You simply have to use strings for storing big numbers and to operate on them use GMP functions in PHP.
You may check some good GMP functions in the official PHP manual here-
http://php.net/manual/en/ref.gmp.php
I found another solution, but the number will be stored as a string. As soon as you cast it back to a numeric, you'll be restricted to the precision of the underlying platform. On a 32 bit platform, the largest int you can represent as an int type is 2,147,483,647:
/**
* #param string $a
* #param string $b
* #return string
*/
function terminal_add($a,$b)
{
exec('echo "'.$a.'+'.$b.'"|bc',$result);
$ret = "";
foreach($result as $line) $ret .= str_replace("\\","",$line);
return $ret;
}
// terminal_add("123456789012345678901234567890", "9876543210")
// output: "123456789012345678911111111100"
$x = 62574 * 62574;
// Cast to an integer
$asInt = intval($x);
var_dump($asInt);
var_dump($asInt % 104659);
// Use use sprintf to convert to integer (%d), which will casts to string
$asIntStr = sprintf('%d', $x);
var_dump($asIntStr);
var_dump($asIntStr % 104659);
<?php
function add($int1,$int2){
$int1 = str_pad($int1, strlen($int2), '0', STR_PAD_LEFT);
$int2 = str_pad($int2, strlen($int1), '0', STR_PAD_LEFT);
$carry = 0;
$str = "";
for($i=strlen($int1);$i>0;$i--){
$var = $int1[$i-1] + $int2[$i-1] + $carry;
$var = str_pad($var, 2, '0', STR_PAD_LEFT);
$var = (string) $var;
$carry = $var[0];
$str = $str . $var[1];
}
$res = strrev($str.$carry);
echo ltrim($res,"0");
}
add($int1,$int2);
?>