我正在尝试提出一个程序来将用户输入（字符串）存储在向量中，并按长度降序排列 output

Question

An example would be.

Input:

Hey this is fantastic!

Output:

fantastic!
this
Hey
is

sorry if I haven't asked the question properly. This is all I have to go by.

Answer 1

Check out the std::sort function from <algorithm> and std::vector<std::string> . There are plenty of examples on the internet on how to write a function that orders the strings by descending order (pass the function to std::sort ).

Answer 2

Use the std::sort() standard algorithm, giving it a predicate that sorts in descending order, eg:

#include <iostream>
#include <sstream>
#include <vector>
#include <string>
#include <algorithm>

int main() {
    std::vector<std::string> v;
    std::string s;

    std::getline(std::cin, s);

    std::istringstream iss(s);
    while (iss >> s) {
        v.push_back(s);
    } 

    std::sort(v.begin(), v.end(),
        [](const std::string &a, const std::string &b){ return a.size() >= b.size(); }
    );

    for(auto &word: v) {
        std::cout << word << std::endl;
    }

    return 0;
}

Live demo

Answer 3

Check out the method reverse from std Library, this is an example I just found on Internet, it will reverse the order on the string vector you pass on it. http://www.cplusplus.com/reference/algorithm/reverse/