Add funtionalites

Source-Code/BMICalculator/script.js

@@ -0,0 +1,20 @@
+document.getElementById('btn').addEventListener('click', () => {
+  const height = parseFloat(document.getElementById('height').value);
+  const weight = parseFloat(document.getElementById('weight').value);
+
+  if (
+    Number.isNaN(height)
+    || Number.isNaN(weight)
+    || height <= 0
+    || weight <= 0
+  ) {
+    document.getElementById('result').innerHTML = 'Please enter valid positive numbers for height and weight.';
+    return;
+  }
+
+  const heightInMeters = height / 100;
+  const bmi = weight / (heightInMeters * heightInMeters);
+  const bmio = bmi.toFixed(2);
+
+  document.getElementById('result').innerHTML = `Your BMI is ${bmio}`;
+});