CODEWITHSUNDEEP
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joedar
joedar

Reputation: 11

javascript code prime numbers wont show

I am studying JavaScript and right now is Im trying to show the prime numbers. but unfortunately it doesnt display. can someone help Iam stuck with these.

This is my code:

function getPrimes(max) {
var sieve = [], i, j, primes = [];
for (i = 2; i <= max; ++i) {
 if (!sieve[i]) {
      primes.push(i);
        for (j = i << 1; j <= max; j += i) {
            sieve[j] = true;
        }
    }
}
return primes;
}
getPrimes(10);

and also I tried this. but still nothing shows. second code:

function findeprime(num){
 var isPrime;
 for (var i = 2; i < num; i++){
         isPrime = true;
         for (coun = 2; coun < i; coun++) {
         if (i % coun == 0) isPrime = false;
         }
    if (isPrime) document.write(i + " is prime <br/>");
    }
}
finderprime(5);

Upvotes: 1

Views: 79

Answers (2)

Bhavin Shah
Bhavin Shah

Reputation: 2482

For the 1st code you have not printed variable primes

function getPrimes(max) {
var sieve = [], i, j, primes = [];
for (i = 2; i <= max; ++i) {
 if (!sieve[i]) {
      primes.push(i);
        for (j = i << 1; j <= max; j += i) {
            sieve[j] = true;


        }
    }

}
       document.writeln(primes);
}
getPrimes(10);

For the 2nd code, You have given different names to the same function.

function findprime(num){
 var isPrime;
 for (var i = 2; i < num; i++){
         isPrime = true;
         for (coun = 2; coun < i; coun++) {
         if (i % coun == 0) isPrime = false;
         }
    if (isPrime) document.write(i + " is prime <br/>");
    }
}

var number = 5;
findprime(number);

Upvotes: 0

Emily
Emily

Reputation: 385

What exactly do you mean by "doesn't display"? This code works fine for me in a console. You just don't have any code to actually output or display the returned values.

If you're trying to output to the console, try using console.log().

If you're trying to make this appear on a webpage, try out document.write();.

Upvotes: 1

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