(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

 1 int _tmain(int argc, _TCHAR* argv[])
 2 {
 3     fstream file;
 4     file.open("temp.csv", ios::out);
 5 
 6     int min = 0, max = 0, num = 0;
 7     cout << "please input max, min, num :" << endl;
 8     cin >> max >> min >> num;
 9     cout << "max = " << max << " min = " << min << " num = " << num << endl;
10     double rnd = (double)((rand() % 10) + 1) / 10;
11     int step_range = (max - min) / 10;
12     int i = 0;
13     vector<int> temp;
14     
15     while (max > (step_range * i) + min){
16         temp.push_back((step_range * i) + min);
17         i++;
18     }
19     i--;
20     int index = 0;
21     while (num){
22         int value = (rand() % 100) + 1;
23         double x = max / ((double)(rand() % 10) + 1) / 10;
24         double res = value * x + temp[rand() % i + 1];
25         while (res > max)
26         {
27             value = (rand() % 100) + 1;
28             x = max / ((double)(rand() % 10) + 1) / 10;
29             res = value * x + temp[rand() % i];
30         }
31         file << index << "," << res << endl;
32         index++;
33         num--;
34     }
35 
36     system("pause");
37     return 0;
38 }

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++;
    }