C :: Pointers As Arguments In Functions

I'm having some problems with a function. The function is supposed to find the two largest values in an array.

Code:

void find_two_largest( const int *a, int n, int *largest, int *second_largest){
largest = a;
int temp;
second_largest = a;
for ( int i = 1; i < n; i++){
if (*(a + i) > *largest){
temp = *largest;

[Code]....

I don't see any mistake with the code of the function, but when I try to call it inside my program it only returns 0 for both largest and second_largest.

Code:

int *find_middle( int *a, int n);
void find_two_largest(const int *a, int n, int *largest, int *second_largest);
int main()
{
int n;

[Code]...

Do I have to declare the variables largest and second_largest as normal integer variables and then pass their addresses as arguments to find_largest or is that incorrect?