CODEWITHSUNDEEP
c++
Kevin Tao
Kevin Tao

Reputation: 11

How to access a member of an object in a stack? C++

How to assign/read a member of an object in a stack?

struct item{
    char opra; 
    int count;
    double operand;
};
stack<item> S;
double test = S.top.operand;

it not works, thanks.

Upvotes: 1

Views: 156

Answers (2)

marques
marques

Reputation: 29

You are just making a typo. top in stack is a function, I let you here a working example:

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

struct item{
    char opra; 
    int count;
    double operand;
};


int main() 
{ 
    item a;
    a.opra = 'a';
    a.count = 3;
    a.operand = 5.0;
    stack<item> S;
    S.push(a);

    // Stack top 
    cout << S.top().operand; 
    return 0; 
}

Output:

5

Upvotes: 1

Alexandre Senges
Alexandre Senges

Reputation: 1599

Top is a method, so you should call S.top().operand. I got it to compile like that:

#include <iostream>
#include <stack>

struct item{
    char opra;
    int count;
    double operand;
};


int main(){
        std::stack<item> S;
        double test = S.top().operand;
        return 0;
}

Upvotes: 1

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