subscripted value is neither array nor pointer nor vector in c

Question

how remove this error tried everything.... this program is about finding 5 closest number from a array... in main part i simply take array, num and size and passes through the function

void printclosest(int arr[], int x, int n)
{
int diff[30];
int i,j,k,p,a;
 for (i = 0; i < n; ++i)
    {
        for (j = i + 1; j < n; ++j)
        {
            if (arr[i] > arr[j])
            {
                a =  arr[i];
                arr[i] = arr[j];
                arr[j] = a;
            }
        }
    }

for(i=0;i<n;i++)
{
diff[i]=abs(a[i]-x);

}


for (k = 0; k < n; ++k)
    {
        for (p = k + 1; p < n; ++p)
        {
            if (diff[k] > diff[p])
            {
                a =  arr[k];
                arr[k] = arr[p];
                arr[p] = a;
            }
        }
    }
    for(i=0;i<5;i++)
  { printf("%d",arr[i]);
   }
    }

Answer 1

a声明为int ，但是您尝试在此处将其用作数组：

diff[i]=abs(a[i]-x);