Write a program that calculates the factorial of a number entered by the user. The factorial of n is denoted by n! and is the product of all positive integers up to and including n. For example, 5! = 5 * 4 * 3 * 2 * 1 = 120.
let num = parseInt(prompt("Enter a number:"));
let factorial = 1;
for(let i = 1; i <= num; i++) {
factorial *= i;
}
console.log(`The factorial of ${num} is ${factorial}`);
Write a program that generates a multiplication table for the numbers from 1 to 10. The output should be in the form of a table, with the numbers from 1 to 10 as the row and column headers, and the products as the table entries.
for(let i = 1; i <= 10; i++) {
let row = '';
for(let j = 1; j <= 10; j++) {
row += `${i * j}\t`;
}
console.log(row);
}
Write a program that generates a random integer between 1 and 100, and then prompts the user to guess the number. If the user’s guess is too low or too high, the program should provide a hint. The program should continue prompting the user until they guess the correct number.
const randomNumber = Math.floor(Math.random() * 100) + 1;
let guess;
do {
guess = parseInt(prompt("Guess the number (between 1 and 100):"));
if(guess < randomNumber) {
console.log("Too low, try again!");
} else if(guess > randomNumber) {
console.log("Too high, try again!");
}
} while(guess !== randomNumber);
console.log(`Congratulations! You guessed the number ${randomNumber}!`);
Write a program that generates the first n terms of the Fibonacci sequence. The Fibonacci sequence is a series of numbers in which each number is the sum of the two preceding numbers. The first two numbers in the sequence are 0 and 1. For example, the first 10 terms of the Fibonacci sequence are 0, 1, 1, 2, 3, 5, 8, 13, 21, and 34.
let n = parseInt(prompt("Enter the number of terms:"));
let a = 0, b = 1;
for(let i = 1; i <= n; i++) {
console.log(a);
let temp = a + b;
a = b;
b = temp;
}
Write a program that generates a random password of length n, where n is entered by the user. The password should consist of a mix of letters, numbers, and symbols. The program should ensure that the password contains at least one uppercase letter, one lowercase letter, one number, and one symbol.
const letters = 'abcdefghijklmnopqrstuvwxyz';
const numbers = '0123456789';
const symbols = '!@#$%^&*()_+-={}[]:";\'<>?,./|\\';
let password = '';
const length = parseInt(prompt("Enter the length of the password:"));
let hasUppercase = false;
let hasLowercase = false;
let hasNumber = false;
let hasSymbol = false;
for(let i = 0; i < length; i++) {
let type = Math.floor(Math.random() * 4);
switch(type) {
case 0:
password += letters[Math.floor(Math.random() * letters.length)];
hasLowercase = true;
break;
case 1:
password += letters[Math.floor(Math.random() * letters.length)].toUpperCase();
hasUppercase = true;
break;
case 2:
password += numbers[Math.floor(Math.random() * numbers.length)];
hasNumber = true;
break;
case 3:
password += symbols[Math.floor(Math.random() * symbols.length)];
hasSymbol = true;
break;
}
}
if(!hasLowercase) {
password += letters[Math.floor(Math.random() * letters.length)];
}
if(!hasUppercase) {
password += letters[Math.floor(Math.random() * letters.length)].toUpperCase();
}
if(!hasNumber) {
password += numbers[Math.floor(Math.random() * numbers.length)];
}
if(!hasSymbol) {
password += symbols[Math.floor(Math.random() * symbols.length)];
}
console.log(`Your random password is: ${password}`);
Write a program that prompts the user to enter a word, and then outputs all the anagrams of the word. An anagram is a word or phrase formed by rearranging the letters of another word or phrase. For example, the anagrams of “cat” are “act”, “atc”, “cat”, “cta”, “tac”, and “tca”.
function generateAnagrams(word) {
if(word.length === 1) {
return [word];
}
const anagrams = [];
for(let i = 0; i < word.length; i++) {
const char = word[i];
const remainingChars = word.slice(0, i) + word.slice(i + 1);
const subAnagrams = generateAnagrams(remainingChars);
for(let j = 0; j < subAnagrams.length; j++) {
anagrams.push(char + subAnagrams[j]);
}
}
return anagrams;
}
const word = prompt("Enter a word:");
const anagrams = generateAnagrams(word);
console.log(`The anagrams of ${word} are: ${anagrams.join(", ")}`);
Write a program that prompts the user to enter a sentence, and then counts the number of words in the sentence. A word is defined as a sequence of characters separated by spaces or punctuation marks.
const sentence = prompt("Enter a sentence:");
let numWords = 0;
for(let i = 0; i < sentence.length; i++) {
if((i === 0 || sentence[i - 1] === " ") && sentence[i] !== " ") {
numWords++;
}
}
console.log(`The sentence "${sentence}" contains ${numWords} words.`);
Write a program that generates a random sequence of n letters, where n is entered by the user. The sequence should contain equal numbers of vowels and consonants, and should not contain any repeated letters.
const n = Number(prompt("Enter the number of letters:"));
const vowels = ["a", "e", "i", "o", "u"];
const consonants = ["b", "c", "d", "f", "g", "h", "j", "k", "l", "m", "n", "p", "q", "r", "s", "t", "v", "w", "x", "y", "z"];
let letters = [];
// Generate random vowels
for(let i = 0; i < n / 2; i++) {
let vowel = vowels[Math.floor(Math.random() * vowels.length)];
letters.push(vowel);
}
// Generate random consonants
for(let i = 0; i < n / 2; i++) {
let consonant = consonants[Math.floor(Math.random() * consonants.length)];
letters.push(consonant);
}
// Shuffle letters randomly
for(let i = 0; i < letters.length; i++) {
let j = Math.floor(Math.random() * (i + 1));
let temp = letters[i];
letters[i] = letters[j];
letters[j] = temp;
}
console.log(`Random sequence of ${n} letters: ${letters.join("")}`);
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