reversing an array

 #include<stdio.h>

void rev(int n, int a[n]);

int main()

    {

int a[]={1,34,66,71,89,93,660};

int n;

printf("enter n:");

scanf("%d",&n);

rev(7,a);

for(int i=0;i<n;i++)

{

    printf("array element at %d position:%d\n",i+1,a[i]);

}

    }

void rev(int n,int a[n])

{

for(int i=0;i<n/2;i++)

{

    int temp=a[i];

    a[i]=a[n-1-i];

    a[n-1-i]=temp;

}

}