c-resources/CPlusPlus20ForProgrammers-master/examples/ch06/fig06_01.cpp

// fig06_01.cpp
// Initializing an array's elements to zeros and printing the array.
//#include <../libraries/fmt/include/format.h> // C++20: This will be #include <format>
#include <iostream>
#include <array>
#include <vector>
#include <string>

template <typename T>
void printArray(T& a, std::string tag){
   std::cout << "Element       Value --->  "<<tag <<"\n" ;

   // output each array element's value
   for (size_t i{0}; i < a.size(); ++i) {
      std::cout <<  i << a[i]<<"\n";
   }
}
int main() {
   std::array<int, 5> values{}; // values is an array of 5 int values
   std::array<double,10> floatarray;
   std::vector<double> floatvector(20, 0);
   for (size_t i{0}; i < floatarray.size(); i++)
        floatarray[i] = i*i/10.0;
        
   // initialize elements of array values to 0        
   for (size_t i{0}; i < values.size(); ++i) {
      values[i] = i*i; // set element at location i to 0
   }

   printArray(values,"values");
   printArray(floatarray,"floatarray");
   printArray(floatvector, "floatvector");
   std::cout <<  "Element      Value\n" << "\n";
    
   floatvector.resize(5);
   printArray(floatvector,"floatvector resized");
   // access elements via the at member function
   for (size_t i{0}; i < values.size(); ++i) {
      std::cout <<  i<<values.at(i) <<"\n";
   }
/*   for (auto i : values){
       std::cout <<  i << values.at(i)<<"\n";
   }
   */
   // accessing an element outside the array's bounds with at
  // values.at(10); // throws an exception
}

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