c语言 找最小值

#include <stdio.h>
#define N 10
#define MIN(X,Y) ((X<Y)?(X):(Y))  

int f(int arr[],int len,int n)
{
    if(n == len-)
        return arr[n];  

    int min = f(arr,len,n+);  

    return MIN(min,arr[n]);
}  

int main (void)
{
    int arr[N] = {,,,,,,,,-};  

    int min = f(arr,N,);
    printf("%d ",min);  

    return ;
}