c++ - 使用 for 循环显示内容

Question

我正在尝试编写一个程序，从包含五种不同水果或蔬菜的数组中随机选择三个项目，然后将随机选择的内容显示给用户。现在我很难理解为什么我的输出不一致，因为有时当我运行它时我会得到这样的东西:

This bundle contains the following: 


Broccoli

缺少前两项，有时我会得到这个:

This bundle contains the following: 
Tomato
Tomato
Tomato

这是我目前遇到问题的代码部分:

void BoxOfProduce::output() {

        cout << "This bundle contains the following: " << endl;

        // Use this so it will be truly random
        srand(time(0));

        for (int f = 0; f < 3; f++) {

            // Here were making the random number
            int boxee = rand() % 5;

            // Adding the content to the box
            Box[f] = Box[boxee];

            // Now were calling on the function to display the content
            displayWord(boxee);

        } // End of for loop

    } // End of output()


    void BoxOfProduce::displayWord(int boxee) {

        cout << Box[boxee] << endl;

    }


int main() {

    BoxOfProduce b1;
    b1.input();
    b1.output();

有人能帮我理解为什么我会得到这个输出吗？谢谢!

Answer 1

不要像你那样做:)就像 @John3136 指出的那样，你弄乱了你的 Box 变量..

void BoxOfProduce::output()
{

  srand(time(NULL)); //keep in mind that this is NOT entirely random!
  int boxee = rand() % 5;
  int i = 0;
  while(i<5)
  {
    boxee = rand() % 5;
    cout<<Box[boxee]<<endl;  //this line might be wrong, my point is to print element of your array with boxee index
    i++;
  }

}