05-basic-knowledge-solution.md

Question 1. Create two variables and store some numbers in them. Now do below operations:

• Addition
• Multiplication
• Substraction
• Divide

let a = 20;
let c = 10;
console.log(a + c);
console.log(a - c);
console.log(a * c);
console.log(a / c);

Question 2. Take one number. If number is odd then print odd else print even.

let a = 10;
if (a % 2 === 0) {
  console.log("even");
} else {
  console.log("odd");
}

Question 3. Using prompt ask user to enter name and then show the name in alert.

let name = prompt("What is your name?");
alert(name);

Question 4. Take two numbers if first number is less than second number than print your name, age and mobile number else print your father name, age and mobile number.

let a = 2;
let b = 10;
if (a < b) {
  console.log("Sajid");
  console.log(32);
  console.log(979475435);
} else {
  console.log("Majid Khan");
  console.log(55);
  console.log(988789798);
}

Question 5. Take two numbers. Now using && and || operator check if both numbers are divisible of 5 && 10 or not. Also check both numbers are even or not.

let a = 10;
let b = 20;
if (
  a % 5 === 0 &&
  a % 10 === 0 &&
  b % 10 === 0 &&
  b % 5 === 0 &&
  a % 2 === 0 &&
  b % 2 === 0
) {
  console.log("Yes");
} else {
  console.log("No");
}

Question 6. print Hello world using console.log, window.alert and document.write

console.log("hello");
window.alert("hello");
document.write("hello");

Question 7. Take all falsy values and check in if condition.

if (NaN) {
  console.log("Yes");
} else {
  console.log("No");
}

if (0) {
  console.log("Yes");
} else {
  console.log("No");
}

if ("") {
  console.log("Yes");
} else {
  console.log("No");
}

if (null) {
  console.log("Yes");
} else {
  console.log("No");
}

if (false) {
  console.log("Yes");
} else {
  console.log("No");
}

if (undefined) {
  console.log("Yes");
} else {
  console.log("No");
}

Question 8. Using confirm box ask questions "Do you want to play?". if user click on Ok then print yes and if user click on Cancel then print No

let ans = confirm("Do you want to play?");
if (ans) {
  console.log("Yes");
} else {
  console.log("No");
}

Question 9. If total members in your family are more than 5 then print Big Family, if members are between 3 to 5 then print small family else print very small family

let familyMembers = 1;
if (familyMembers > 5) {
  console.log("Big family");
} else if (familyMembers >= 3 && familyMembers <= 5) {
  console.log("Small family");
} else {
  console.log("Very small family");
}

Question 10. Using ++, -- print 1 to 10 and then 10 to 5

let a = 0;
console.log(++a);
console.log(++a);
console.log(++a);
console.log(++a);
console.log(++a);
console.log(++a);
console.log(++a);
console.log(++a);
console.log(++a);
console.log(++a);

console.log(a--);
console.log(a--);
console.log(a--);
console.log(a--);
console.log(a--);
console.log(a--);