C :: Finding And Returning A Common Value From Array Of 8 Integers

how assignments is to write code that returns a value that is repeated more than once in an array of 8 integers.For example:

Numbers: 30 12 100 33 2 2 1 40
Output: 2

Here is my code so far:

Code:

#include <stdio.h
int main(void){
int i;
int j;
int arr[8];
int count;
int maxCount = 0;
int maxValue = 0;

[code]....

When I compile this code (on Vim), I get an error when I print the array of 8 above (see ERROR above).