Array product in C++ using STL
In C++, we can quickly find array product using accumulate() and multiplies().
// C++ program to find array product #include <iostream> #include <numeric> using namespace std; // User defined function that returns product of // arr[] using accumulate() library function. int arrayProduct(int a[], int n) { return accumulate(a, a + n, 1, multiplies<int>()); } int main() { int a[] = { 5, 10, 15 }; int n = sizeof(a) / sizeof(a[0]); cout << arrayProduct(a, n); return 0; } |
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Output:
750
product of vector
// C++ program to find vector product #include <iostream> #include <numeric> #include <vector> using namespace std; // User defined function that returns product of // v using accumulate() library function. int arrayProduct(vector<int>& v) { return accumulate(v.begin(), v.end(), 1, multiplies<int>()); } int main() { vector<int> v{ 5, 10, 15 }; cout << arrayProduct(v); return 0; } |
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Output:
750
We can also use a custom function in accumulate. Refer numeric header in C++ STL | Set 1 (accumulate() and partial_product()) for details.
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