JavaScript

1. Check if a Number is Even or Odd
    Question:
    Write a JavaScript program that prompts the user to enter a number and 
    alerts "Even" if the number is even, or "Odd" if the number is odd. Use the 
    modulus operator % to check if the number is divisible by 2.
    Input (via prompt):
    Enter a number: 7
    Expected Output (via alert):
    "Odd"
    Input (via prompt):
    Enter a number: 10
    Expected Output (via alert):
    "Even"
    var num = +prompt ("Enter a number:");
if (num % 2 === 0) {
alert("Even"); // 10
// alert(`${num} is Even`); // 2 is Even
} else {
alert("Odd"); // 7
// alert(`${num} is Odd`); // 9 is Odd
}

A: Output:
// Enter a number
// 7
// 9 is Odd
// 10
// 2 is Even

2. Compare Two Numbers
    Question:
    Write a JavaScript program that prompts the user to enter two numbers and 
    alerts:
    • "Greater" if the first number is greater than the second,
    • "Equal" if both numbers are equal,
    • "Smaller" if the first number is smaller than the second.
    Input (via prompt):
    Enter the first number: 10
    Enter the second number: 5
    Expected Output (via alert):
    "Greater"
    Input (via prompt):
    Enter the first number: 7
    Enter the second number: 7
    Expected Output (via alert):
    "Equal"
    var num1 = +prompt ("Enter the first number:");
var num2 = +prompt ("Enter the second number:");
if (num1 > num2) {
alert("Greater");
} else if (num1 == num2) {
alert("Equal");
} else {
alert("Smaller");
}

A: Output:
// Enter the first number: 10
// Enter the second number: 5
// "Greater"
// Enter the first number: 7
// Enter the second number: 7
// "Equal"

3. Driving Eligibility Check
    Question:
    Write a JavaScript program that prompts the user to enter their age and 
    whether they have a valid driver's license (true or false). The program 
    should alert "Can drive" if the person is 18 or older and has a valid 
    driver's license, otherwise it should alert "Cannot drive."
    Input (via prompt):
    Enter your age: 20
    Do you have a valid driver's license (true/false): true
    Expected Output (via alert):
    "Can drive"
    Input (via prompt):
    Enter your age: 16
    Do you have a valid driver's license (true/false): true
    Expected Output (via alert):
    "Cannot drive"
    var age = prompt ("Enter your age:");
var license = prompt (
"Do you have a valid driver's license (true/false):"
);
if (age >= 18 && license === "true") {
alert ("Can drive");
} else {
alert ("Cannot drive");
}

A: Output:
// Enter your age: 20
// Do you have a valid driver's license (true/false): true
// Can drive
// Enter your age:16
// Do you have a valid driver's license (true/false): true
// Cannot drive



4. Determine if a Number is Positive, Negative, or Zero
    Question:
    Write a JavaScript program that prompts the user to enter a number and 
    alerts "Positive" if the number is greater than 0, "Negative" if the number
    is less than 0,or "Zero" if the number is 0.
    Input (via prompt):
    Enter a number: 5
    Expected Output (via alert):
    "Positive"
    Input (via prompt):
    Enter a number: -3
    Expected Output (via alert):
    "Negative"
    Input (via prompt):
    Enter a number: 0
    Expected Output (via alert):
    "Zero"
    var num = +prompt ("Enter a number: ");
if (num > 0) {
alert("Positive");
} else if (num < 0) {
alert("Negative");

} else {
alert("Zero");
}

A: Output:
// Enter a number: 5
// Positive
// Enter a number: -3
// Negative
// Enter a number: 0
// Zero