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Home/ Questions/Amazing solutions for the access violation writing location c++ error
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Ari Smith
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Ari Smith
Asked: May 18, 20222022-05-18T20:43:48+00:00 2022-05-18T20:43:48+00:00In: cpp

Amazing solutions for the access violation writing location c++ error

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I get the “access violation writing location c++” error as the title says. How can I fix it so the error goes away? Here is my detail:

#include <vector>
 #include <string>
 #include <fstream>
 
 class ElemAlg
 {
 private:
 std::string difficultlyLevel, question, answerToRead;
 std::vector<std::string> questions, answers;
 
 std::vector<std::string> GetQuiz(int);
 };
#include "elemalg.h"
 
 std::vector<std::string> ElemAlg::GetQuiz(int difficulty)
 {
 if (difficulty == 1) { difficultyLevel = "algE"; }
 if (difficulty == 2) { difficultyLevel = "algM"; } 
 if (difficulty == 3) { difficultyLevel = "algH"; }
 if (difficulty == 4) { difficultyLevel = "algVH"; }
 
 std::ifstream fin(difficultyLevel + ".txt");
 while (std::getline(fin, question)) { questions.push_back(question); }
 fin.close();
 
 std::ifstream fin2(difficultyLevel + "Answers.txt");
 while (std::getline(fin2, answerToRead)) { answers.push_back(answerToRead); }
 fin2.close();
 
 return questions;
 }
#includes etc
 ElemAlg *ea;
 ea->GetQuiz(1);

When I operated it, I received the error text:

C++: Access violation writing location

I appreciate any help from you.

access violation writing location c++
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    hdtutoria Expert
    2022-06-22T03:54:41+00:00Added an answer on June 22, 2022 at 3:54 am

    The cause: I think here is your problem:

    ElemAlg *ea;
    ea->GetQuiz(1);

    Because an instance of ElemAlg isn’t created, you are calling a member function on an uninitialized pointer.

    The compiler won’t have to do any runtime lookup because the member function you’re calling isn’t virtual, which is why the call goes to GetQuiz. However, because ea is uninitialized, this pointer will be garbage, resulting in undefined behavior when you access a member variable (such as difficultyLevel). That undefined behavior results in an access violation.

    Solution: You can solve this error by initializing ea:

    ElemAlg *ea=new ElemAlg;
    ea->GetQuiz(1)

    or

    ElemAlg ea;
    ea.GetQuiz(1)
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