text: If we want to change the value of the character in a string, we must define the loop variable as a reference type.
  #include <iostream> using namespace std; int main(){ string nickname = "josdem"; for(char &c: nickname){ c = toupper(c); } cout << nickname << endl; }
  Vector
  A vector is a collection of objects, all which have the same type. Every object in the collection has an associated index, which gives access to that object. To use a vector, we must include the header.
  #include <iostream> #include <vector> using namespace std; int main(){ vector<int> integers = {1,2,3,4,5}; for(int i=6; i < 10; i++){ integers.push_back(i); } for(int i: integers){ cout << i << endl; } }
  Vector operations
  vector.empty();
  vector.size();
  vector.push_back(t)
  vector[n];
  Arrays
  An array is a data structure that is similar to the vector, but it has a fixed size; so it offer a better run time performance.
  #include <iostream> using namespace std; int main(){ int integers[10] = {0,1,2,3,4}; for(int i=5; i < 10; i++){ integers[i] = i; } for(int i: integers){ cout << i << endl; } }
  WARNING We cannot initialize an array as a copy of anorher array.
  You can define multidimensional arrays
  int matrix[3][4] this is an array of size 3; each element is an array of ints of size 4
  Return to the main article