Question

我创建了一个程序，可以计算提供的字符串中的元音数量。它会正确计数元音，并在用户提供“ y”或“ Y”时重复进行。但是，当它重复时，它会自动为我尝试使用的C字符串分配“”。

int main()
{
    //Creating repeating decision
    char answer = 'y';

    while ((answer == 'y') || (answer == 'Y'))
    {

        //declaring our C-String
        char ourString[81] = "Default";

        //Prompting user for a string, storing it as a C-String
        std::cout << "Please enter a string!(Less than 80 characters please.)\n";
        std::cin.getline(ourString, 81);

        //Using a loop to count the amount of vowels
        int ourNum = 0;
        int vowels = 0;

        while (ourString[ourNum] != '\0')
        {
            switch (ourString[ourNum]) {
            case 'a':
            case 'A':
            case 'e':
            case 'E':
            case 'i':
            case 'I':
            case 'o':
            case 'O':
            case 'u':
            case 'U':
            case 'y':
            case 'Y':
                vowels++;
                ourNum++;
                break;
            default:
                ourNum++;
                break;
            }

        }
        std::cout << "The numbers of vowels in: \"" << ourString << "\" is " << vowels << "!\n";
        std::cout << "Do again? Please enter \"Y\" to repeat, or any other character to escape.";
        std::cin >> answer;

    }

}

任何方向将不胜感激。谢谢！

Answer 1

在写入“ y”并按下回车按钮之后，“ Y”和fig, ax = plt.subplots(nrows=2, ncols=4, figsize=(20,10)) fig.delaxes(ax[1,3]) #7 days in a week, remove 8th panel ax = ax.flatten() #Far easier to work with a flattened array lsize=8 plt.subplots_adjust(wspace=0.05, hspace=0.15) #Remove some whitespace between subplots for idx, gp in df.groupby(df.Date.dt.dayofweek): ax[idx].set_title(gp.Date.dt.day_name().iloc[0]) #Set title to the weekday (gp.groupby(gp.Date.dt.hour).size().rename_axis([None]).to_frame() .reindex(np.arange(0,24,1)).fillna(0) .plot(kind='bar', ax=ax[idx], rot=0, ec='k', legend=False)) # Titles on correct panels if idx%4 == 0: _ = ax[idx].set_ylabel('Counts', fontsize=11) if (idx//4 == 1) | (idx%4 == 3): _ = ax[idx].set_xlabel('Tweet Hour', fontsize=11) # Ticks on correct panels _ = ax[idx].tick_params(axis='both', which='major', labelsize=lsize, labelbottom=(idx//4 == 1) | (idx%4 == 3), bottom=(idx//4 == 1) | (idx%4 == 3), labelleft=(idx%4 == 0), left=(idx%4 == 0)) # Consistent bounds between subplots. lb, ub = list(zip(*[axis.get_ylim() for axis in ax])) for axis in ax: axis.set_ylim(min(lb), max(ub)) plt.show()都存储在输入缓冲区中，因此“ y”进入答案字符，并且认为“ / n”下一条getline的输入。有一些解决方案。您可以在"/n"之后向cin.ignore()添加呼叫。或者，您可以将yes设为字符串，然后在其中使用cin >> yes而不是getline。

C ++ While循环未重新分配字符串值

1 个答案: