範例6-3－Quality of life is not what you get but what you become

//---------------------------------------------------------------------------
#include <iostream>
//---------------------------------------------------------------------------
int total;         //目前數字的總和
int item;          //下一個加總的數字
int minus_items;   //負數

int main(int argc, char* argv[])
{
        total = 0;
        minus_items = 0;
        while (true){
          std::cout << "請輸入欲加總的數字 \n";
          std::cout << " 或 0 表示結束: ";
          std::cin >> item;

if (item == 0)
break;

          if (item < 0){
            ++minus_items;
            continue;
          }
          total += item;
          std::cout << " 小計: " << total << '\n';
        }
        std::cout << " 總和: " << total << '\n';
        std::cout << " 共有: " << minus_items << " 個負數被忽略 \n";
        std::system("pause");
        return 0;
}
//---------------------------------------------------------------------------

題目來源：C++風格與藝術第二版 Steve Oualline 著黃吉霈編譯