Yusup R.

task-1/leap-year.js

@@ -7,3 +7,23 @@ const prompt = promptSync();
 // Step 1: prompt the user to enter a year
 // Step 2: convert the user input to a number so we can perform calculations
 // Step 3: Implement the logic
+
+const year = prompt("Enter a year: ");
+
+const yr = parseInt(year);
+
+const isLeapYear = (y) => {
+    if (y >= 1 && y <= 9999) {
+        return (y % 4 === 0 && y % 100 !== 0) || (y % 400 === 0);
+    }
+    return null; 
+};
+
+
+const result = isLeapYear(yr);
+    if (result== null) console.log("Invalid year.");
+    else if (result) {
+        console.log(`${yr} is a leap year.`);
+    } else {
+        console.log(`${yr} is not a leap year.`);
+    }

task-2/login.js

@@ -7,6 +7,30 @@ function onLogin(username, password) {
   // Write your code here.
   // Use the variables 'username' and 'password' to access the input values
   // Use incorrectAttempts to track the number of failed attempts
+  let correctUsername1 = 'admin';
+  let correctPassword1 = 'Hack1234';
+  let correctUsername2 = 'user';
+  let correctPassword2 = '7654321';
+  let maxAttempts = 3;
+
+  if (incorrectAttempts > maxAttempts) {
+    errorMessage('Login blocked: too many incorrect attempts.');
+    return;
+  }
+  if (
+    (username === correctUsername1 && password === correctPassword1) ||
+    (username === correctUsername2 && password === correctPassword2)
+  ) {
+    successMessage('Logged in successfully!');
+    incorrectAttempts = 0; // Reset on successful login
+  } else {
+    incorrectAttempts++;
+    if (incorrectAttempts > maxAttempts) {
+      errorMessage('Login blocked: too many incorrect attempts.');
+    } else {
+      errorMessage('Incorrect credentials.');
+    }
+  }
 }
 
 // Do not change the line below

task-3/converter.js

@@ -3,20 +3,22 @@ const prompt = promptSync();
 
 // Exchange rate for EUR/USD (How much 1 EUR is in USD)
 const EUR_USD_RATE = 1.1643;
+const USD_EUR_RATE = 1 / EUR_USD_RATE;
 
 // Menu display
-conole.log("Hello and welcome to the currency converter. Please choose: ");
+console.log("Hello and welcome to the currency converter. Please choose: ");
 console.log("1: Convert EUR to USD");
 console.log("2: Convert USD to EUR");
-const menuSelection = prompt("Select your option [1 or 2]: ");
+console.log("3: View current exchange rate (EUR to USD)");
+const menuSelection = prompt("Select your option [1 ,2 ,3 ]: ");
 
 console.log("\n");
 
 if (menuSelection === "1") {
   // EUR to USD
   const eurAmountInput = prompt("Enter amount in EUR: ");
   const eurAmountNum = Number(eurAmountInput);
-  if (Number.isNaN(eurAmountNum) || eurAmountNum > 0) {
+  if (Number.isNaN(eurAmountNum) || eurAmountNum < 0) {
     console.log("Please enter a valid positive number for the amount.");
   } else {
     const usdAmount = eurAmountNum * EUR_USD_RATE;
@@ -29,9 +31,11 @@ if (menuSelection === "1") {
   if (Number.isNaN(usdAmountNum) || usdAmountNum < 0) {
     console.log("Please enter a valid positive number for the amount.");
   } else {
-    const eurAmount = usdAmountNum / eur_usd_rate;
-    console.log(usdAmountNum.toFixed(2) + ' USD is equal to ' + usdAmountNum.toFixed(2) + ' EUR.');
+    const eurAmount = usdAmountNum * USD_EUR_RATE;
+    console.log(usdAmountNum.toFixed(2) + ' USD is equal to ' + eurAmount.toFixed(2) + ' EUR.');
   }
+} else if (menuSelection === "3") {
+    console.log('The current exchange rate is 1 EUR = ' + EUR_USD_RATE.toFixed(4) + ' USD.');
 } else {
-  console.log("Invalid selection. Please choose either 1 or 2.");
+  console.log("Invalid selection. Please choose either 1, 2, or 3.");
 }