How to pop all the string from stack and store them in string variable?-CodePudding

This code pop all the required strings from the stack. But i want to store those string elements in a final one string variable. How to do it?

#include <sstream>
#include <stack>
#include <string>
#include<iostream>
using namespace std;

int main()
{
    istringstream iss("abdd hhh |post_exp| a * b / (c   d) ^ f - g |\\post_exp| anndd jjss");
    stack <string> mudassir;
    string subs;
    while (iss >> subs) {
        if (subs == "|post_exp|")
        {
            while (iss >> subs && subs.find("|\\post_exp|") == string::npos)
            {
                mudassir.push(subs);
               
            }
        }
    }

    while (!mudassir.empty()) {
        mudassir.top();
        mudassir.pop();
    }
    cout << endl;

    return 0;
}

CodePudding user response：

Use a while loop

#include <iostream>
#include <stack>
#include <string>
#include <vector>

int main()
{
    std::stack<std::string> stack;
    stack.push("!");
    stack.push("world");
    stack.push("hello ");
    
    std::string str;

    while (!stack.empty())
    {
        str.append(stack.top());
        stack.pop();
    }

    std::cout << str; 
    
    return 0;
}

CodePudding user response：

You're almost good, but in the while-loop you'd like to build the string. This can be done multiple ways, what I'd recommend is:

    std::ostringstream oss;
    while (!mudassir.empty()) {
        oss << mudassir.top();
        mudassir.pop();
    }
    // if you'd like it in a variable,
    // std::string result = oss.str();
    std::cout << oss.str() << std::endl;