Why are created variables not null in c++?

Question

Programming

Hey!
There is this code in c++:

#include <iostream>
using namespace std;

int main()
{
  int a,b,c,d;

  cout << "a = " << a << "\n"; // a = 379757328
  cout << "b = " << b << "\n"; // b = 32764
  cout << "c = " << c<< "\n"; // c = 0
  cout << "d = " << d << "\n"; // d = 0

  return 0;
}

And I don't understand why the variable a and b is equal to some number?
In this case, the other two variables are equal to zero! I have no idea why that is.

Answer 1

Because you considered the chapter of the C ++ textbook about creating variables and initializing them to be nonsense. When creating a variable on the stack in C++, the memory location that the variable looks at does not change its value. Therefore, there is garbage to meet at times. if the initial value of the variable is important to you - initialize the variable MANUALLY)

Answer 2

use universal initialization:
now a = 0

Answer 3

Learn assembler. After him, such questions cannot arise in principle.
Learn what a stack is, how it works, how it grows, how memory is allocated on it. It's better to use a visual debugger for this, such as OllyDbg or x64dbg.