C returns 0xC0000005 status-CodePudding

I am new to C . In the code below, I am probably doing something wrong, because in the terminal I get Process returned -1073741819 (0xC0000005) execution time : 1.533 s
main.cpp

#include <iostream>
#include "foo.h"

int main() {
    Baz* quuz;
    quuz->quux();

    return 0;
}

foo.h

#include <vector>

class Bar {
public:
    bool boolean_val;

};

class Baz {
private:
    std::vector<Bar> qux;
public:
    void quux();
};

foo.cpp

#include "foo.h"
#include <iostream>

void Baz::quux()
{
    qux[0].boolean_val = true;
}

Could you please highlight what I am doing wrong?

CodePudding user response：

    Baz* quuz;
    quuz->quux();

Calling a function on an uninizialized pointer is no bueno.

void Baz::quux()
{
    qux[0].boolean_val = true;
}

Follows uninitiliazed this pointer to access qux. Undefined behavior invoked. You're lucky to get a crash. 0xC0000005 is accessed memory that is not mapped.