poj 2871 A Simple Question of Chemistry

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//注意输入的格式即可! #include <iostream>#include <cstdio>using namespace std;int main(){    double num1, num2, ans;    bool flag = false;    while (1){          if (!flag){              cin >> num1;              flag = true;          }          if (num1 == 999)  break;          cin >> num2;          ans = num2 - num1;          num1 = num2;          if (num1 == 999)  break;          printf("%.2lf\n", ans);    }    cout << "End of Output" << endl;    system("pause");}

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