如何将数组与字符串一起使用

Question

我正在创建一个接收句子或段落的程序。然后它会询问用户他们想做什么。 - 隐蔽到所有大写 - 隐藏到所有小写字母 - 删除空格 - 拆分单词并删除重复项 - 在字符串中搜索一个单词

我得到了所有这些，但我不知道如何拆分单词并删除重复项..

选择第四个选择（“拆分单词”）时，应将单词放入数组或结构中，并且每个单词都应用循环显示。在此之后，应执行重复删除，程序必须确定重复的单词并消除它们。此后，应再次打印单词列表。

对此的任何帮助将不胜感激。谢谢

这是我的代码，我需要案例“D”方面的帮助

#include <iostream>
#include <cmath>
#include <cstdlib>
#include <string>
#include <algorithm>
#include <cctype>

using namespace std;
int main() {

    string s;
    char selection;
    string w;

    cout << "Enter a paragraph or a sentence : ";

    getline(cin, s);

    int sizeOfString = s.length();

    //cout << "The paragraph has " << sizeOfString << " characters. " << endl; ***Dummy call to see if size works. 

    //cout << "You entered " << s << endl; *** Dummy function !!

    cout << "" << endl;

    cout << "                 Menu          " << endl;
    cout << "        ------------------------" << endl;
    cout << "" << endl;
    cout << "A -- Convert paragraph to all caps " << endl;
    cout << "B -- Convert paragraph to all lowercase " << endl;
    cout << "C -- Delete whitespaces " << endl;
    cout << "D -- Split words & remove duplicates " << endl;
    cout << "E -- Search a certain word " << endl;
    cout << "" << endl;

    cout << "Please select one of the above: ";
    cin >> selection;
    cout << "" << endl;

    switch (selection) //Switch statement
    {
        case 'a':
        case 'A':
            cout << "You chose to convert the paragraph to all uppercase" << endl;
            cout << "" << endl;
            for (int i = 0; s[i] != '\0'; i++) {
                s[i] = toupper(s[i]);
            }
            cout << "This is it: " << s << endl;
            break;
        case 'b':
        case 'B':
            cout << "You chose to convert the paragragh to all lowercase" << endl;
            cout << "" << endl;
            for (int i = 0; s[i] != '\0'; i++) {
                s[i] = tolower(s[i]);
            }
            cout << "This is it: " << s << endl;
            break;
        case 'c':
        case 'C':
            cout << "You chose to delete the whitespaces in the paragraph" << endl;
            cout << "" << endl;
            for (int i = 0; i < s.length(); i++) {
                if (s[i] == ' ') 
                    s.erase(i, 1);
            }
            cout << "This is it: " << s << endl;
            break;
        case 'd':
        case 'D':
            cout << "You chose to split the words & remove the duplicates in the paragraph" << endl;
            cout << "" << endl;
        case 'e':
        case 'E':
            cout << "You chose to search for a certain word in the paragraph. " << endl;
            cout << "" << endl;
            cout << "Enter the word you want to search for: ";
            cin >> w;

            s.find(w);
            if (s.find(w) != std::string::npos) {
                cout << w << " was found in the paragraph. " << endl;
            } else {
                cout << w << " was not found in the paragraph. " << endl;
            }
    }
    return 0;
}

Answer 1

您可以使用stringstream 以空格分隔字符串，并使用set<string> 以仅包含唯一单词。那么你的代码应该是这样的：

case 'D': 
{
        cout << "You chose to split the words & remove the duplicates in the paragraph" << endl;

        string buf;
        stringstream ss(s); // Insert the string into a stream

        set<string> tokens; // Create vector to hold our words

        while (ss >> buf)
            tokens.insert(buf);

        cout << "This is it: " << endl;

        for (set<string>::iterator it = tokens.begin(); it != tokens.end(); ++it) {
            cout << *it << " ";
        }

        cout << endl;

        break;
}