18. Data for iteration: vector

• To do just about anything of interest, we need a collection of data to work on. We can store this collection in a vector. For example:

  
  //#include "std_lib_facilities.h"
  // -or-
  #include <iostream>
  #include <vector>
  using namespace std;
  
  // read some temperatures into a vector:
  int main()
  {
      vector< double > temps;  // declare a vector of type double to store
                               // temperatures are values like 62.4
  
      double temp;             // a variable for a single temperature value
  
      while ( cin >> temp ) {  // cin reads a value and stores it in temp    
          // store the value of temp in the vector
          temps.push_back( temp );
      }
      //...
  }
  
  

• Note that cin >> temp returns true until we reach the end of file or encounter something that isn't a double: like the word "end".