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  1.     #include <iostream>
  2.  
  3.     class Store {
  4.         enum { MaxCount = 64 };
  5.         float store_[MaxCount] {};
  6.         size_t count_ = 0;
  7.     public:
  8.         // return the maximum number of elements we can store
  9.         size_t capacity() const { return MaxCount; }
  10.         // true/false: is the store empty?
  11.         bool empty() const { return count_ == 0; }
  12.         // return the current count
  13.         size_t size() const { return count_; }
  14.  
  15.         bool add(float value) {
  16.             if (count_ >= capacity()) {
  17.                 std::cerr << "store is full!\n";
  18.                 return false;
  19.             }
  20.             store_[count_] = value;
  21.             ++count_;
  22.         }
  23.         // reset
  24.         void clear() {
  25.             count_ = 0;  // we don't actually need to change the store
  26.         }
  27.         // allow array-like usage
  28.         const float& operator[](size_t index) const { return store_[index]; }
  29.         float& operator[](size_t index) { return store_[index]; }
  30.         // provide bounds-checked array-ish access
  31.         float at(size_t index) const {
  32.             if (index >= count_)
  33.                 throw std::invalid_argument("array index out of bounds");
  34.             return store_[index];
  35.         }
  36.     };
  37.  
  38.     int main() {
  39.         Store store;
  40.         for (size_t i = 0; i < store.capacity(); ++i) {
  41.             std::cout << "Enter number #" << i << " or -ve to stop: " << std::flush;
  42.             float f = -1;
  43.             std::cin >> f;
  44.             std::cout << "\n" << f << "\n";
  45.             if (f < 0)
  46.                 break;
  47.             store.add(f);
  48.         }
  49.         std::cout << "You entered " << store.size() << " values:";
  50.         for (size_t i = 0; i < store.size(); ++i) {
  51.             std::cout << ' ' << store[i];
  52.         }
  53.         std::cout << '\n';
  54.     }
  55.  
Success #stdin #stdout 0s 3472KB
comments (?)
stdin 
10
42
1
3
5.2
-1
stdout 
Enter number #0 or -ve to stop: 
10
Enter number #1 or -ve to stop: 
42
Enter number #2 or -ve to stop: 
1
Enter number #3 or -ve to stop: 
3
Enter number #4 or -ve to stop: 
5.2
Enter number #5 or -ve to stop: 
-1
You entered 5 values: 10 42 1 3 5.2
https://ideone.com/boE3Ki
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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