accumulate vector c++ code example

Example 1: 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
}

Example 2: accumulate in cpp

accumulate(start, end, initial_sum);

Example 3: accumulate vector c++

//Syntax
accumulate(first, last, sum);
accumulate(first, last, sum, myfun); 

first, last : first and last elements of range 
              whose elements are to be added
sum :  initial value of the sum
myfun : a function for performing any 
        specific task. For example, we can
        find product of elements between
        first and last.
//Example
  int a[] = {5 , 10 , 15} ;
  int res = accumulate(a,a+3,0); // 30