What is the problem here?

Question

#include <iostream>
using namespace std;

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

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

The output is 4202046 How??

Answer 1

Use
void myFunc(int &x){ //passed by reference
x=100;
}

You can refer Pass by value and pass by reference section in C++ course.