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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>If-else conditional statement</title>
+</head>
+
+<body>
+
+</body>
+
+</html>
+<script>
+  //Exercise lv1
+  // var age = window.prompt("Enter your age!");
+  // if (age >= 18) {
+  //   alert("You are old enough to drive");
+  // } else {
+  //   let ageNeed = 18 - age;
+  //   alert(`You are left with ${ageNeed} to drive!`);
+  // }
+
+
+  // var yourAge = window.prompt("Enter your age!");
+  // (yourAge > 20) ? alert("You are older than me.") : alert("You are younger than me!"); 
+  //Exercise 2
+  let grade = window.prompt("Enter grade: ");
+  if (grade >= 0 && grade <= 100) {
+    if (grade >= 80 && grade <= 100) {
+      alert("A");
+    } else if (grade >= 70) {
+      alert("B");
+    } else if (grade >= 60) {
+      alert("C");
+    } else if (grade >= 50) {
+      alert("D");
+    } else alert("F")
+  }
+
+</script>
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