reverse order of elements in array

Question

what is wrong in this ??
if there any mistake correct and reply
#include <stdio.h>
void main()
{
int b,n;
int a[n];
int i,j;
printf("Enter the number of elements\n");
scanf("%d",&n);
for(b=0;b<n;b++)
scanf("%d", &a[b]);
printf("The reverse order is \n");
for(i=1;i<=n;i++)
{
j=n-i;
printf("%d\n",a[j]);
}
}

Answer 1

the array declaration is wrong int a[n] ,your are assigning the value of n after the above statement.
if you do then the value of n should be constant and it should be after the header
#define n 10
then you can proceed with int a[n]
Because in c and c++ the declaration should be at the initial level but in case of java u can declare variable Any where in the program.