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arithmetic.php
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arithmetic.php
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<?php
$a = 5;
$b = 10;
function add($a, $b)
{
if (is_numeric($a) && is_numeric($b)) {
return $a + $b;
} else {
return error($a, $b, 'regular');
}
}
function subtract($a, $b)
{
if (is_numeric($a) && is_numeric($b)) {
return $a - $b;
} else {
return error($a, $b, 'regular');
}
}
function multiply($a, $b)
{
if (is_numeric($a) && is_numeric($b)) {
$i = 0;
for ($c = 0; $c < $b; $c++) {
$i = $i + add($a, $a);
}
return $i;
} else {
return error($a, $b, 'regular');
}
}
function divide($a, $b)
{
if (is_numeric($a) && is_numeric($b)) {
if($a == 0 || $b == 0) {
return error($a, $b, 'zero');
} else {
return $a / $b;
}
} else {
return error($a, $b, 'regular');
}
}
function modulus($a, $b)
{
if (is_numeric($a) && is_numeric($b)) {
return $a % $b;
} else {
return error($a, $b, 'regular');
}
}
function error($a, $b, $problem)
{
if ($problem == 'regular') {
return "Warning: Invalid Characters.\nFirst Argument is a(n) " . gettype($a) . " & Second Argument is a(n) " . gettype($b) . ".\nBoth arguments must be numeric";
} else if ($problem == 'zero') {
return "Warning! You Cannot Divide by Zero!!!";
}
}
echo add($a, $b) . PHP_EOL;
echo subtract($a, $b) . PHP_EOL;
echo multiply("Hello", true) . PHP_EOL;
echo divide($a, 0) . PHP_EOL;
echo modulus(2, 2) . PHP_EOL;
?>