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C++ Fundamentals for Professionals

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Explore how to use the std::accumulate function in C++ to perform common operations on vectors such as summing integers, multiplying elements with lambda functions, and processing strings. This lesson enhances your understanding of advanced algorithm techniques for sorting and numeric operations.

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Solution #

C++ 17
#include <iostream>
#include <numeric>
#include <string>
#include <vector>
int main(){
  std::cout << std::endl;
  std::vector<int> myVec{1, 2, 3, 4, 5, 6, 7, 8, 9};
  auto res1 = std::accumulate(myVec.begin(), myVec.end(), 0);
  std::cout << "res1: " << res1 << std::endl;
  
  auto res2= std::accumulate(myVec.begin(), myVec.end(), 1, [](int fir, int sec){ return fir * sec; });
  std::cout << "res2: " << res2 << std::endl;
  
  std::vector<std::string> strVec2{"Only", "for", "testing", "purpose"};
  
  std::string res3 = std::accumulate(strVec2.begin() + 1, strVec2.end(), strVec2[0], 
                                     [](auto fir, auto sec){ return fir + ":" + sec; });
  
  std::cout << "res3: " << res3 << std::endl;
  std::cout << std::endl;
}

Explanation

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