(C/C++) 亂數應用

因為公司需要寫了一個亂數產生測試條件的小程式，再此紀錄下來

 int _tmain(int argc, _TCHAR* argv[])
 {
     fstream file;
     file.open("temp.csv", ios::out);

     int min = , max = , num = ;
     cout << "please input max, min, num :" << endl;
     cin >> max >> min >> num;
     cout << "max = " << max << " min = " << min << " num = " << num << endl;
     double rnd = (double)((rand() % ) + ) / ;
     int step_range = (max - min) / ;
     int i = ;
     vector<int> temp;

     while (max > (step_range * i) + min){
         temp.push_back((step_range * i) + min);
         i++;
     }
     i--;
     int index = ;
     while (num){
         int value = (rand() % ) + ;
         double x = max / ((double)(rand() % ) + ) / ;
         double res = value * x + temp[rand() % i + ];
         while (res > max)
         {
             value = (rand() % ) + ;
             x = max / ((double)(rand() % ) + ) / ;
             res = value * x + temp[rand() % i];
         }
         file << index << "," << res << endl;
         index++;
         num--;
     }

     system("pause");
     return ;
 }

因為條件內有上下限的限制所以先把條件範圍歸類成幾個區塊，但是在C++裡頭array沒辦法動態調整大小所以我用Vector

動態調整新增我的條件範圍

    while (max > (step_range * i) + min){
        temp.push_back((step_range * i) + min);
        i++;
    }