Prime ou não em JavaScript
function isPrime(num) {
for(var i = 2; i < num; i++)
if(num % i === 0) return false;
return num > 1;
}
Troubled Trout
function isPrime(num) {
for(var i = 2; i < num; i++)
if(num % i === 0) return false;
return num > 1;
}function isPrime(num) {
for (let i = 2; i * i <= num; i++)
if (num % i === 0)
return false;
return num > 1;
}// program to print prime numbers between the two numbers
// take input from the user
const lowerNumber = parseInt(prompt('Enter lower number: '));
const higherNumber = parseInt(prompt('Enter higher number: '));
console.log(`The prime numbers between ${lowerNumber} and ${higherNumber} are:`);
// looping from lowerNumber to higherNumber
for (let i = lowerNumber; i <= higherNumber; i++) {
let flag = 0;
// looping through 2 to user input number
for (let j = 2; j < i; j++) {
if (i % j == 0) {
flag = 1;
break;
}
}
// if number greater than 1 and not divisible by other numbers
if (i > 1 && flag == 0) {
console.log(i);
}
}// program to check if a number is prime or not
// take input from the user
const number = parseInt(prompt("Enter a positive number: "));
let isPrime = true;
// check if number is equal to 1
if (number === 1) {
console.log("1 is neither prime nor composite number.");
}
// check if number is greater than 1
else if (number > 1) {
// looping through 2 to number-1
for (let i = 2; i < number; i++) {
if (number % i == 0) {
isPrime = false;
break;
}
}
if (isPrime) {
console.log(`${number} is a prime number`);
} else {
console.log(`${number} is a not prime number`);
}
}
// check if number is less than 1
else {
console.log("The number is not a prime number.");
}