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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_valarray_sum.htm below:

C++ valarray Library - Function sum

It returns the sum of all the elements in the valarray, as if calculated by applying operator+= to a copy of one element and all the other elements, in an unspecified order.

Following is the declaration for std::valarray::sum function.

T sum() const;

T sum() const;

none

It returns the sum of all the elements in the valarray.

Basic guarantee − if any operation performed on the elements throws an exception.

All elements effectively copied are accessed.

In below example explains about std::valarray::sum function.

#include <iostream>
#include <valarray>

int main () {
   int init[]={0,10,20,30};
   std::valarray<int> myvalarray (init,4);
   std::cout << "The sum is " << myvalarray.sum() << '\n';

   return 0;
}

Let us compile and run the above program, this will produce the following result −

The sum is 60

valarray.htm

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