How to find sum in c++

Several ways to sum in C include: Built-in function std::accumulate(): Calculates the sum of a series of values. Built-in function sum(): Short for accumulate(), takes a container as input. Container method std::vector::accumulate(): Specially used for std::vector containers. Container method std::vector::sum(): Returns the sum of all elements in the container.

How to sum in C

C provides a variety of built-in functions and container methods to calculate arrays and vectors Or the sum of the elements in the list.

Built-in function

• accumulate(): Used to calculate the sum of a series of values. It accepts an iterator range and an optional initial value, and returns the sum.

<code class="cpp">#include <numeric>
#include <iostream>

int main() {
  int arr[] = {1, 3, 5, 7, 9};
  int sum = std::accumulate(arr, arr + 5, 0);
  std::cout << "总和为：" << sum << std::endl;
  return 0;
}</code>

• sum(): This is the abbreviated version of accumulate() which takes a container as input and returns the sum.

<code class="cpp">#include <vector>

int main() {
  std::vector<int> vec = {1, 3, 5, 7, 9};
  int sum = std::sum(vec);
  std::cout << "总和为：" << sum << std::endl;
  return 0;
}</code>

Container methods

• std::vector::accumulate(): Similar to std: :accumulate(), but designed specifically for std::vector containers.
• std::vector::sum(): Returns the sum of all elements in the container, similar to std::sum().

Example

<code class="cpp">#include <vector>

int main() {
  std::vector<int> vec = {1, 3, 5, 7, 9};
  int sum = std::accumulate(vec.begin(), vec.end(), 0);
  std::cout << "总和为：" << sum << std::endl;
  return 0;
}</code>

Notes

• For very large or very small sizes that may produce overflow numbers, consider using long long or other large integer types.
• For an empty container or range, the sum function returns the initial value (usually 0).

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