Scientific calculator source code in PHP with database
This is a Scientific calculator that can perform the simple arithmetic tasks (+, -, * and /) as well as other math functions, such as, sin, cos, tan, min, max, log, exponent, pi, power, and square root.
HTML Code of Scientific calculator
<form method="post" action=""> <h1>Scientific Calculator</h1><br> <p>*Please Enter Numbers in the First Field Only For Math Functions.</p> 1st Number: <input name="num1" value=""><br> 2nd Number: <input name="num2" value=""><br> <input type="submit" name="sub" value="+"> <input type="submit" name="sub" value="-"> <input type="submit" name="sub" value="x"> <input type="submit" name="sub" value="/"><br> <input type="submit" name="sub" value="e"> <input type="submit" name="sub" value="pi"> <input type="submit" name="sub" value="pow"> <input type="submit" name="sub" value="sqrt"><br> <input type="submit" name="sub" value="cos"> <input type="submit" name="sub" value="sin"> <input type="submit" name="sub" value="tan"> <input type="submit" name="sub" value="log"><br> <input type="submit" name="sub" value="max"> <input type="submit" name="sub" value="min"> <br>Answer: <input type='text' value="<?php echo $ans; ?>"><br> </form><div class="button"> <form method="post"> <input class="get" type="submit" name="answer" value="Retrieve Data"> </form>
PHP Code of Scientific calculator
We are using Else-If statement for checking which operator to apply.
<?php
if(isset($_POST['sub']))
{
$num1=$_POST['num1'];
$num2=$_POST['num2'];
$oprtr=$_POST['sub'];
if($oprtr=="+")
$ans=$num1+$num2;
else if($oprtr=="-")
$ans=$num1-$num2;
else if($oprtr=="x")
$ans=$num1*$num2;
else if($oprtr=="/")
$ans=$num1/$num2;
else if($oprtr=="cos")
$ans=cos($num1);
else if($oprtr=="sin")
$ans=sin($num1);
else if($oprtr=="tan")
$ans=tan($num1);
else if($oprtr=="e")
$ans=exp($num1);
else if($oprtr=="log")
$ans=log($num1);
else if($oprtr=="pi")
$ans=pi($num1);
else if($oprtr=="pow")
$ans=pow($num1);
else if($oprtr=="sqrt")
$ans=sqrt($num1);
else if($oprtr=="max")
$ans=max($num1,$num2);
else if($oprtr=="min")
$ans=min($num1,$num2);
}
?>
We are going to store the numbers, operators, and answers in the database.
Database Connection Code for Scientific calculator
Our database name is “calculator”. The table name is “valuescal”.
<?php
$conn = mysqli_connect("localhost","root","","calculator");
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
?>
Database of Scientific calculator
Let’s see the screenshot of the database of the scientific calculator.
Query:
To insert data in the database we will use this query:
$sql = "INSERT INTO `valuescal` (`id`, `number1`, `number2`, `operator`, `result`) VALUES (NULL, '$num1', '$num2', '$oprtr', '$ans') ";
if ($conn->query($sql) === TRUE){
echo "Answers and Values are Saved.";
}
else {
echo "Error whilst saving Answers and Values: " . $sql . "<br>" . $conn->error;
}
To get the stored data from the database:
<?php
if(isset($_POST['answer']))
{
$sql = "SELECT * FROM valuescal";
$result = $conn->query($sql);
if(mysqli_num_rows($result) > 0){
echo "<br><center><b>All Answers:<b></center><br>";
echo "<center><table style='border: 2px dashed grey;'>";
echo "<tr>";
echo "<th>First Number:</th>";
echo "<th>Second Number:</th>";
echo "<th>Operator</th>";
echo "<th>Result</th>";
echo "</tr>";
while($row = mysqli_fetch_array($result)){
echo "<tr>";
echo "<td>" . $row['number1'] . "</td>";
echo "<td>" . $row['number2'] . "</td>";
echo "<td>" . $row['operator'] . "</td>";
echo "<td>" . $row['result'] . "</td>";
echo "</tr>";
}
echo "</table></center>";
mysqli_free_result($result);
} else{
echo "Don't have any saved data in the database.";
}
}
?>
Output:
