How to For Loop

beginner c++17

In C++ for loops are used to access elements one at a time from an array, container, or any other object that supports iteration.

Loop Through a std::vector

#include <iostream>
#include <vector>

int main() {
  std::vector numbers{1, 2, 3};
  for (auto x : numbers) {
    std::cout << x << "\n";
  }
}

1
2
3

Loop Through a std::map

#include <iostream>
#include <map>

int main() {
  std::map<std::string, float> fruitPrices {
    { "Apple", 0.69f },
    { "Banana", 0.89f },
    { "Orange", 1.1f },
  };

  for(auto [fruit, price] : fruitPrices) {
    std::cout << fruit << "s cost $" << price << ".\n";
  }
}

Apples cost $0.69.
Bananas cost $0.89.
Oranges cost $1.1.