CPP

accumulate c++

#include <numeric> // Accumulate
#include <vector> // Vector 
using namespace std;

int main()
{
  vector<int> nums{1,2,3,4,5};
  int sum = 0;
  sum = accumulate(nums.begin(), nums.end(), sum);
  // nums.begin() -> first number in a list 
  // nums.end() -> last number in a list 
  // sum -> starting value before accumulating: Here its 0
}

accumulate() in c++

accumulate(first, last, sum);
first, last : first and last elements of range 
              whose elements are to be added
              suppose array is 'a'.
sum :  initial value of the sum
Eg: int sum=0;
	accumulate(a.begin(),a.end(),sum);

accumulate in cpp

    accumulate(start, end, initial_sum);

accumulate c++

// C++ program to demonstrate working of accumulate()
#include <iostream>
#include <numeric>
using namespace std;
 
// User defined function
int myfun(int x, int y)
{
    // for this example we have taken product
    // of adjacent numbers
    return x * y;
}
 
int main()
{
    // Initialize sum = 1
    int sum = 1;
    int a[] = { 5, 10, 15 };
 
    // Simple default accumulate function
    cout << "
Result using accumulate: ";
    cout << accumulate(a, a + 3, sum);
 
    // Using accumulate function with
    // defined function
    cout << "
Result using accumulate with"
            "user-defined function: ";
    cout << accumulate(a, a + 3, sum, myfun);
 
    // Using accumulate function with
    // pre-defined function
    cout << "
Result using accumulate with "
            "pre-defined function: ";
    cout << accumulate(a, a + 3, sum, std::minus<int>());
 
    return 0;
}

accumulate in c++

accumulate