Problems in C++ Prime Number Checker

[Bollom]

Hi guys,

i have some problems with my program

my program should ask user ton enter two numbers

and then generate the primes between these numbers and output it on screen

and i must use a void function as our doctor say unless i will lose marks

i could not make the function void so i made it return function

and after i wrote the program i discovered that the program work correctly but it is output the primes and after the primes directly output " 1 "

so i have two problems the first that i must convert the function to void

and the second is i want to remove the " 1 " which make me crazy because its appear in every output and i hope you help me guys , this is the program :



#include<iostream>
#include<cmath>

using namespace std;

printPrimes ( int, int);


int main()

{
int num,num2;




cout<<"Enter The First Number:"<<endl;

cin>>num;

cout<<"Enter The Second Number:"<<endl;

cin>>num2;


while (num>=num2)

{
cout<<"The First Number Should Be smaller Than The Second Number"<<endl;

cout<<endl;

cout<<"Enter The First Number"<<endl;

cin>>num;

cout<<"Enter The Second Number"<<endl;

cin>>num2;

}


cout<<"The Primes Between The First Number and The Second Number are"<<endl;



cout<<printPrimes (num,num2)<<endl;



return 0;

}



printPrimes (int num,int num2)

{


bool prime = true;

int number3;

number3 =(int) floor (sqrt (num2));


while (num<=num2)

{
for ( int j = 2; j<=number3; j++)

{
if ( num!=j && num % j == 0 )

{
prime = false;
break;
}

}


if (prime)

{
cout <<" "<<num<<" "<<endl;


}

prime = true;


num++;

}

return prime;

}





and thanks in advance.