调用函数,怎么改啊心碎
#include<stdio.h>
#include<math.h>
int isPrime(int N){
int k;
for (k=2;k<N-1;k++){
if (N%k==0){
isPrime=0;
}
}
}
int main(void)
{
int N;
scanf("%d",&N);
if( isPrime(N) ){
printf("%d is a prime.\n");
}else{
printf("%d is not a prime.\n");
}
return 0;
}