Question

我的rand（）函数有问题我想建立一个程序，当你掷骰子6000次时显示每个骰子的数量

我写了这段代码

#include <iostream>
using namespace std;
#include <iomanip>
using std::setw;
#include <cstdlib>
#include <ctime>
int main()
{
int face ;
int frequency1 =0;
int frequency2 =0;
int frequency3 =0;
int frequency4 =0;
int frequency5 =0;
int frequency6 =0;
for(int counter =1;counter <=6000;counter++){

      face = 1+rand()%6;
      switch(face){
    case 1:
        ++frequency1;
        break;

     case 2:
        ++frequency1;
        break;

     case 3:
        ++frequency1;
        break;

     case 4:
        ++frequency1;
        break;

     case 5:
        ++frequency1;
        break;

     case 6:
        ++frequency1;
        break;
     default:
        cout<<"program should never get here!!! ";
        break;
  }}
  cout<<"the number of face 1 is : "<<frequency1<<endl;
 cout<<"the number of face 2 is : "<<frequency2<<endl;
 cout<<"the number of face 3 is : "<<frequency3<<endl;
 cout<<"the number of face 4 is : "<<frequency4<<endl;
 cout<<"the number of face 5 is : "  <<frequency5<<endl;
 cout<<"the number of face 6 is : "      <<frequency6<<endl;
 return 0;
 }

每次运行此代码时，它都显示相同的内容

the number of face 1 is : 6000
the number of face 2 is : 0
the number of face 3 is : 0
the number of face 4 is : 0
the number of face 5 is : 0
the number of face 6 is : 0

Answer 1

您只是不断添加frequency1而不是其他情况。我试图向你解释，但你似乎仍然不明白。这是编辑过的代码：

#include <iostream>
using namespace std;
#include <iomanip>
using std::setw;
#include <cstdlib>
#include <ctime>

int main() {
    int face;
    int frequency1 = 0;
    int frequency2 = 0;
    int frequency3 = 0;
    int frequency4 = 0;
    int frequency5 = 0;
    int frequency6 = 0;
    for(int counter =1;counter <=6000;counter++){
        face = 1+rand()%6;
        switch(face){
            case 1:
                ++frequency1;
                break;

            case 2:
                ++frequency2;
                break;

            case 3:
                ++frequency3;
                break;

            case 4:
                ++frequency4;
                break;

            case 5:
                ++frequency5;
                break;

            case 6:
                ++frequency6;
                break;
            default:
                cout<<"program should never get here!!! ";
                break;
        } 
    }
    cout<<"the number of face 1 is : "<<frequency1<<endl;
    cout<<"the number of face 2 is : "<<frequency2<<endl;
    cout<<"the number of face 3 is : "<<frequency3<<endl;
    cout<<"the number of face 4 is : "<<frequency4<<endl;
    cout<<"the number of face 5 is : "<<frequency5<<endl;
    cout<<"the number of face 6 is : "<<frequency6<<endl;
    return 0;
}

如您所见，您的原始代码在所有案例陈述中都++frequency1（递增）。这个编辑过的代码应该可行我已经解释了这个。

rand（）函数无法正常工作

1 个答案: