Getting an weird error....

Question

String p="12";
int a=Integer.nextInt(p);
getting this error- .nextInt();
^illegal start of expression.

getting the same error if i use Integer.valueOf(p);
can anybody tell me why??

Answer 1

Both Nathan and Palanski are right. Also, there are some little mistakes including array index range. The later part seemed complex, so I changed it in my own way. Feel free to knock if you have any question :)

https://code.sololearn.com/c0oB8rDC7kZ0/?ref=app

Answer 2

By definition, a prime number shouldn't have any other divisor except 1 and the number itself. So while checking if the number is prime or not, don't check 1 and that number. That's why the loop range should be like

for (i=2; i<number; i++)
// start from 2, stop before number

Now, consider a particular number, say 12.
12's divisors: 1,2,3,4,6,12
excluding 1 and 12: 2,3,4,6

See, there's no divisor after 6 which is number/2. so we can skip the later numbers. This is not mandatory but efficient.

In your code, you're checking divisibility by 2. Instead, you have to check whether the numbers are divisible by (2.... number-1 or number/2) or not.

Answer 3

Working fine here, did I miss anything?
https://code.sololearn.com/cOyy5tXFdrIS/?ref=app

Answer 4

There is no Integer.nextInt() function.
nextInt() belongs to scanner class instead.

Use Integer.parseInt(p);

Answer 5

use parseInt() instead of nextInt(). Your assign a string into integer that's why you get an error. Convert it into integer.

Answer 6

remove public in "public int reverse1", and in your for loop there's an error. Mispelled declaration of int. It must be int j = 3 not intj = 3

Answer 7

I think its the "*" that's causing the error

input number: 9 for example

when this line has been reached:

int reverse1 = Integer.parseInt(*9);

we get an error...

Answer 8

Shamima Yasmin
i copied what you did but i am still getting the same illegal start of expression error.
I will share the code.
I am writing a program to find if a number is twisted prime or not eg: 167 and 761 both are primes

https://code.sololearn.com/cXwMc2Pe9IpD/?ref=app

Answer 9

nextInt() is method of Scanner object you cannot call that from an Integer class

Answer 10

Palanski i updated the question

Answer 11

Palanski
thankx it worked.... understood my mistake

Answer 12

my pleasure...

Answer 13

Shamima Yasmin
in the for loop why did you do number/2.

Answer 14

Shamima Yasmin
here's my updated code
why am i getting no output.

https://code.sololearn.com/cXwMc2Pe9IpD/?ref=app

Answer 15

cHiRaG GhOsH i am so sorry i made a small mistake in the question.... i used parseInt(); but still keep getting the same error....