C/C++ :: Counting Number Of Distinct Values

I am trying to write a function that will count the number of distinct values in an array of N size and return that number. For example array a[n] = {1, 2, 3, 1, 2, 3, 1}. My code won't look exactly like this because I am using an array that can be modified by user input. it is part of a bigger program that will also has a function for finding the Equilibrium Index for that same array. This is what my Code looks like:

void findDistinctValues() {
int t = 0;
int j = 0;
int disValue = 0;
for( i = 0; i < arraySize; i++) {

[Code] .....

This function works but the problem is it returns 16, or the number of times that the number being compared does not equal the one it is being compared to. how do I get it to only return the number of distinct values? The data set mentioned above is what I am using for input data so it should only have 3 values.