Question

How to check if an array contains a pair of numbers whose product is even in C++

Answer 1

#include <vector>
#include <iostream>

// A produce of a pair of integers will always be even if at least 1 of them are even

bool arrayContainsAPairOfEvenProduct(std::vector<int> &arr) {
	int oddCount = 0;

	for (int i = 0; i < arr.size(); i++) {
		if (arr[i] % 2 == 0) {
			return true;
		}
	}

	return false;
}

int main()
{
	std::vector<int> arr = {1, 1, 3, 3, 5, 5, 8, 9, 9, 11}; // 8 * ? = Even

	std::wcout << arrayContainsAPairOfEvenProduct(arr) << std::endl;
}



/*
run:

1

*/

 

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Answer 2

#include <iostream>
 
// A produce of a pair of integers will always be even if at least 1 of them are even
 
bool arrayContainsAPairOfEvenProduct(int arr[], int size) {
    int oddCount = 0;
 
    for (int i = 0; i < size; i++) {
        if (arr[i] % 2 == 0) {
            return true;
        }
    }
 
    return false;
}
 
int main()
{
    int arr[] = {1, 1, 3, 3, 5, 5, 8, 9, 9, 1}; // 8 * ? = Even
    int size = sizeof(arr) / sizeof(arr[0]);
  
    std::wcout << arrayContainsAPairOfEvenProduct(arr, size) << std::endl;
}
 
 
 
/*
run:
 
1
 
*/

 

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