Prime in range LAE 23012020

#include <stdio.h>
#include <math.h>

int main ( void ) {
    int a, b;
    bool isPrime;
    scanf ( "%d%d", &a, &b );
    if ( a > b )
        printf ( "0\n" );
    else
    while ( a < b ) {
        isPrime = true;
        /// If is prime
        for ( int i = 2; i <= sqrt(a); i++ ) {
            if ( a % i == 0 ) {
                isPrime = false;
                break;
            }
        }

        if ( isPrime )
            printf ( "%d ", a );
        a ++;
    }

    return 0;
}