Question

这是我正在练习的一些代码编程：使用C ++的原理和实践：

#include <iostream>

using namespace std;

int main() {

    int numberOfWords = 0;

    string previous = " ";  // the operator >> skips white space

    string current;

    cout << "Type some stuff.";

    cin >> current;

    while (cin >> current) {

        ++numberOfWords;    // increase word count

        if (previous == current)

            cout << "word number " << numberOfWords

                 << " repeated: " << current << '\n';

        previous = current;


    }

}

它正在按预期工作，但我注意到它没有检测到重复的第一个字 - 例如“run run”将没有返回，“run run run”会告诉我重复单词2但不是单词编号1.出于好奇，我需要在此代码中更改以检测单词1是否重复？

Answer 1

有了这个，你正在跳过第一个词：

cin >> current;

while (cin >> current) {

编辑：由于第一个单词无法与任何内容进行比较，我们可以将第一个单词的值设置为previous，并从第二个单词开始比较：

cin >> previous;
while (cin >> current) {

Answer 2

只需准确编码您想要的内容。这是一种方式：

#include <iostream>
using namespace std;

int main()
{
    int numberOfWords = 1;
    bool previousMatch = false;

    string previous;  // the operator >> skips white space
    string current;

    cout << "Type some stuff." << std::endl;

    cin >> previous;
    while (cin >> current)
    {
        if (previous == current)
        {
            if (! previousMatch)
            {   // Previous word repeated too
                cout << "word number " << numberOfWords
                     << " repeated: " << current << '\n';
                previousMatch = true;
            }

            cout << "word number " << numberOfWords + 1
                 << " repeated: " << current << '\n';
        }
        else
            previousMatch = false;

        ++numberOfWords;    // increase word count
        previous = current;
    }
}

检测重复的单词c ++，不检测第一个单词

2 个答案: