谁能帮我看看这个检查一个数是否是素数的程序哪里有问题,谢谢!
 #include <stdbool.h>
#include <stdio.h>
bool is_prime(int n)
{
    int divisor;
    if (n <= 1)
        return false;
    for (divisor = 2; divisor * divisor <= n; divisor++)
        if (n % divisor == 0)
            return false;
    return true;
}
int main(void)
{
    int n;
    printf("Enter a number: ");
    scanf("%d", &n);
    if (is_prime(n));
        printf("Prime\n");
    else
        printf("Not prime\n");
    return 0;
}
注:运行以后出现以下错误:
ERROR: Can't have an 'else' here
ERROR: syntax error before or at line 20 in file 'prime.c'
  ==>:     else
  BUG:     else<== ??? bug may be here
ERROR: cannot execute command 'prime.c'
>Exit code: -1

谢谢各位的回复,看来我是太粗心了.