I dont no how to fix. Can someone help me out plz. (Please see the picture)


class DynIntStack
    // Structure for stack nodes
    struct StackNode
        int value;        // Value in the node
        StackNode *next;  // Pointer to the next node

    StackNode *top;      // Pointer to the stack top

    // Constructor
    {  top = NULL; }

    // Destructor

    // Stack operations
    void push(int);
    void pop(int &);
    bool bracketsame(char,char);
    bool balancedparantheses(string); //checks if parentheses are
    bool isEmpty();

#include "DynIntStack.h"
#include <iostream>
#include <string>
using namespace std;

// Main to run program
int main()
    string expression;

    cout<<"Enter an expression to check: ";

        cout<<"Balanced expression \n";

        cout<<"Expression is not balanced \n";
bool bracketsame(char opening,char closing) // function checks if opening and closing brackets are same
    if(opening == '(' && closing == ')') return true;
    else if(opening == '{' && closing == '}') return true;
    else if(opening == '[' && closing == ']') return true;
    return false;
bool balancedparantheses(string exp) //checks if parentheses are
{                                    //balanced or not
    stack<char> StackNode;
    for(int i =0;i<exp.length();i++)
        if(exp[i] == '(' || exp[i] == '{' || exp[i] == '[')
        else if(exp[i] == ')' || exp[i] == '}' || exp[i] == ']')
            if(StackNode.empty() || !bracketsame(StackNode.top(),exp[i]))
                return false;
    return StackNode.empty() ? true:false;
    It my first accest to member. I think thtat acesst it right. But didnt work I am stuck. Can someone plz show how please.

Ah, I think I see the problem: the function is a method of the clas, but you did not scope the function as being part of the class in the implementation. When you define a method for a class, and do not implement it inline (which is how most method should be the done - inlining should only be used for one or two line functions), the corresponding implementation has to have the name of the class and the scope operator (::) before the function name. In this case, it should be:

bool DynIntStack::balancedparantheses(string exp) // etc.

You would do the same with bracketname() as well.

I would actually recommend having these two functions in a third file, as the implementation file, and link the file with the program file when you compile it. If you are using an IDE such as Visual Studio or Code::Blocks, it should be sufficient to simply have the implementation file in the project file (under Solution Explorer, in Visual Studio). This lets you treat the class like any other library.

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