/
arithmetic.php
98 lines (81 loc) · 1.33 KB
/
arithmetic.php
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<?php
function validate($a, $b)
{
if (is_numeric($a) && is_numeric($b)) {
return true;
} else {
return "Error: Both need to be numbers.";
}
}
function add($a, $b)
{
$isValid=validate($a,$b);
if($isValid === true)
{
return $a + $b;
} else {
return $isValid;
}
}
function subtract($a, $b)
{
$isValid=validate($a,$b);
if($isValid === true)
{
return $a - $b;
} else {
return $isValid;
}
}
function multiply($a, $b)
{
$isValid=validate($a,$b);
if($isValid === true)
{
return $a * $b;
} else {
return $isValid;
}
}
function divide($a, $b)
{
$isValid=validate($a,$b);
if($b==0){
return "Error: We can't divide by zero.";
}
if($isValid === true)
{
return $a / $b;
} else {
return $isValid;
}
}
function modulus($a, $b)
{
$isValid=validate($a,$b);
if($b==0){
return "Error: We can't modulus by zero.";
}
if($isValid === true)
{
return $a % $b;
} else {
return $isValid;
}
}
function multbyadd($a, $b)
{
$sum=0;
for($i=0; $i<$b; $i++){
$sum=$sum+$a;
} return $sum;
// above works. or i=1; i<=b.
}
echo add("a",7).PHP_EOL;
echo subtract("a",7).PHP_EOL;
echo multiply("a",7).PHP_EOL;
echo multiply(2,7).PHP_EOL;
echo divide(2,0).PHP_EOL;
echo divide(2,7).PHP_EOL;
echo modulus(2,7).PHP_EOL;
echo multbyadd(2,7).PHP_EOL;