adding odds

[serrld113]

hi everyone,
so I want SumOdds to add for example the first 4 odds, but the function is taking 4 as an index so it will start at the beginning of the array and sum whatever odds are in the first 4 positions.

ideas please?

 

#include <iostream>
#include <iomanip>
#include <cctype>

using namespace std;

/*Given Function prototypes*/
void PrintArray(const int arr[], const int size);
void FillArray(int arr[], const int size);

int SumOdds(int arr[], const int SIZE, int odds);

int main()
{
	const int SIZE = 15;
	int arr[SIZE];
	int oddsvalue;


	FillArray(arr, SIZE);

	PrintArray(arr, SIZE);

	cout << "\nHow many odd numbers to add: ";
	cin >> oddsvalue;
	cout << "\nThe sum of the first " << oddsvalue << " odd numbers is: ";
	cout << SumOdds(arr, SIZE, oddsvalue) << "\n";

	return 0;
}

int SumOdds(int arr[], const int SIZE, int oddsvalue)
{
	int sum_odds = 0;
	for (int i = 0; i < oddsvalue; i++)
	{
		if (arr[i] % 2 != 0)
			sum_odds += arr[i];
	}

	return sum_odds;
}


void PrintArray(const int arr[], const int size)
// this function prints the contents of the array
{
	cout << "\nThe array:\n { ";
	for (int i = 0; i < size - 1; i++)	// print all but last item
		cout << arr[i] << ", ";

	cout << arr[size - 1] << " }\n";	// print last item
}

void FillArray(int arr[], const int size)
// this function loads the contents of the array with user-entered values
{
	cout << "Please enter " << size
		<< " integers to load into the array\n> ";

	for (int i = 0; i < size; i++)
		cin >> arr[i];			// enter data into array slot
}

[Yay295]

You need to loop through the array like normal, and have a second number to keep track of how many odds you've found. break from the loop when you've found enough.

int SumOdds ( int arr[], const int SIZE, int oddsvalue )
{
	int sum_odds = 0, num_odds = 0;

	for ( int i = 0; i < SIZE; ++i )
	{
		if ( arr[i] % 2 )
		{
			sum_odds += arr[i];

			++num_odds;

			if ( num_odds > oddsvalue - 1 )
				break;
		}
	}

	return sum_odds;
}

[serrld113]

thank you Yay295, you're a lifesaver!

How would I check if the user inputs say 10 and there are no 10 odds in the array?

[Yay295]

I would make a second function that just returns the number of odds in an array. Don't try to make one function do too much.

[serrld113]

got it! thanks again!