error: expected unqualified-id

[SusieMartin1]

I can't figure out this error. Can someone help, please?

#include <iostream>
using namespace std;
bool isPrime(int number);
{

primeNumber = isPrime(number);

if(primeNumber = true)
cout << "Prime Number" << endl;

bool isPrime(int number)
{
if (number == 0) return false;
if (number == 1) return false;
if (number == 2) return true;
if (number % 2 == 0) return false;

for (int i = 3; i < number; i = 2)

if (number % i == 0) return false;
}
}

[lostwithcpp]

Can you explain what the error is, what line? is it not compiling, runtime error at some line, error in output?

[Arkl1ne5]

You have no main() to encompass your code, and your function implementation is within where main should be.

bool isPrime(int number); // declaration in global, outside of main

int main ()
{
primeNumber = isPrime(number);

if(primeNumber = true)
cout << "Prime Number" << endl;

return 0;
}

bool isPrime(int number) //function implementation is also outside of main (only the call is in //main)
{
.....
}

also, do you have primeNumber declared as int already? Do you have anything assigned to number?