Why removing * producing error?

Question

#include <iostream>
using namespace std;

void myFunc(int x) {
x = 100;
}

int main() {
int var = 20;
myFunc(&var);
cout << var;
}

Answer 1

In C++, Pointer variables are more used for dynamic memory management rather than merely handling references as they do in C language.

Answer 2

Okay for that question.
Sometimes we need work directly on the location where the variable is being store. To access, that address, C++ provide two ways:

1. Pointer Variables
2. Reference Variables.

Answer 3

I'm lost. So why it's not working 4 int?

Answer 4

The above code needs few changes
#include <iostream>
using namespace std;

void myFunc(int &x) {
x = 100;
}

int main() {
int var = 20;
myFunc(var);
cout << var;
}

Answer 5

Why can't we only use int x. Why */&? And how's this working?