10-03-2013
Both Solution's are perfect
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2
3
4
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7
8
9
10
11
12
13
14
15
16
17
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LEARN ABOUT PHP
gmp_gcdext
GMP_GCDEXT(3) 1 GMP_GCDEXT(3)
gmp_gcdext - Calculate GCD and multipliers
SYNOPSIS
array gmp_gcdext (GMP $a, GMP $b)
DESCRIPTION
Calculates g, s, and t, such that a*s + b*t = g = gcd(a,b), where gcd is the greatest common divisor. Returns an array with respective
elements g, s and t.
This function can be used to solve linear Diophantine equations in two variables. These are equations that allow only integer solutions
and have the form: a*x + b*y = c. For more information, go to the "Diophantine Equation" page at MathWorld
PARAMETERS
o $a
-Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is
possible to convert the latter to a number.
o $b
-Either a GMP number resource in PHP 5.5 and earlier, a GMP object in PHP 5.6 and later, or a numeric string provided that it is
possible to convert the latter to a number.
RETURN VALUES
An array of GMP numbers.
EXAMPLES
Example #1
Solving a linear Diophantine equation
<?php
// Solve the equation a*s + b*t = g
// where a = 12, b = 21, g = gcd(12, 21) = 3
$a = gmp_init(12);
$b = gmp_init(21);
$g = gmp_gcd($a, $b);
$r = gmp_gcdext($a, $b);
$check_gcd = (gmp_strval($g) == gmp_strval($r['g']));
$eq_res = gmp_add(gmp_mul($a, $r['s']), gmp_mul($b, $r['t']));
$check_res = (gmp_strval($g) == gmp_strval($eq_res));
if ($check_gcd && $check_res) {
$fmt = "Solution: %d*%d + %d*%d = %d
";
printf($fmt, gmp_strval($a), gmp_strval($r['s']), gmp_strval($b),
gmp_strval($r['t']), gmp_strval($r['g']));
} else {
echo "Error while solving the equation
";
}
// output: Solution: 12*2 + 21*-1 = 3
?>
PHP Documentation Group GMP_GCDEXT(3)