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C++ function and pointer problem

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ok i don't know why this isn't working. i pass the address of the array to the function and it displays them rite. I do the same thing but i can get the program to calculate the sum and average. It is a exercise in my book and i can't seem to get it to calcualte with the function. here is my code
void printscores(int numScores , int * rounds);
void calculate(int numScores, int * rounds);

int main(int argc, char* argv[])
{
	int score=0;
	int rounds[10];
	int curRound = 0 ;

	while (curRound < 10 && score > -1 )
	{
		cout << "Enter a score for round " << curRound +1 << " Negative to stop\n";
		cin>> score;
		if (score > 0 )
		{
		rounds[curRound] = score;
		curRound++;
		}
	}
	printscores(curRound , rounds);
	calculate(curRound , rounds);
	cin.get();
	cin.get();
	return 0;
}

void printscores(int numScores,int * rounds)
{
	for ( int i = 0 ; i < numScores ; i++)
	{
		cout << rounds[i] << ", ";
	}

}

THIS IS THE FUNCTION I CAN"T GET IT TO WORK RITE
void calculate(int numScores,int * rounds)
{
	int sum;
	
	for ( int p = 0 ; p < numScores ; p++)
	{
		sum = sum + rounds[p];
	}
	cout << "\n" << sum;
	cout << "\n" << sum / numScores;

}
i would appreciate it if some1 could help. thnx

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