--- /dev/null
+<!DOCTYPE html>
+<html lang="en">
+<head>
+ <meta charset="UTF-8">
+ <meta name="viewport" content="width=device-width, initial-scale=1.0">
+ <title>basic php calculator</title>
+</head>
+<body>
+ <h1>basic php calculator</h1>
+ <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="GET">
+ <input type="text" id="num1" name="num1" placeholder="e.g. 1">
+ <select name="operator" id="operator">
+ <option value="add" selected>Add</option>
+ <option value="subtract">Subtract</option>
+ <option value="multiply">Multiply</option>
+ <option value="divide">Divide</option>
+ </select>
+ <input type="text" id="num2" name="num2" placeholder="e.g. 2">
+ <button type="submit">Calculate</button>
+ </form>
+
+ <?php
+ if($_SERVER["REQUEST_METHOD"] == "GET"){
+ $num1 = htmlspecialchars($_GET["num1"]);
+ $num2 = htmlspecialchars($_GET["num2"]);
+ $operator = htmlspecialchars($_GET["operator"]);
+
+ // check if inputs has data
+ if(empty($num1) && empty($num2)){
+ echo "fill in all fields.";
+ exit();
+ } elseif(empty($num1)){
+ echo "first input is empty.";
+ exit();
+ } elseif(empty($num2)){
+ echo "second input is empty.";
+ exit();
+ }
+
+ // check if input data are numerical
+ switch(true){
+ case !is_numeric($num1) && !is_numeric($num2):
+ echo "both inputs contain non-numeric data.";
+ break;
+ case !is_numeric($num1):
+ echo "first input contains non-numeric data.";
+ break;
+ case !is_numeric($num2):
+ echo "second input contains non-numeric data.";
+ break;
+ default:
+ calculate($num1, $num2, $operator); // proceed to calculate
+ }
+ }
+
+ function calculate($num1, $num2, $operator){
+ $resultCateg = "";
+ $resultVal = "";
+
+ switch($operator){
+ case "add":
+ $resultVal = $num1 + $num2;
+ $resultCateg = "sum";
+ break;
+ case "subtract":
+ $resultVal = $num1 - $num2;
+ $resultCateg = "difference";
+ break;
+ case "multiply":
+ $resultVal = $num1 * $num2;
+ $resultCateg = "product";
+ break;
+ case "divide":
+ $resultVal = $num1 / $num2;
+ $resultCateg = "quotient";
+ break;
+ default:
+ echo "something went wrong!";
+ return;
+ }
+
+ echo "The {$resultCateg} is \"{$resultVal}\"";
+ }
+ ?>
+</body>
+</html>
\ No newline at end of file
repos / basic-calc.git / commitdiff