What is pass by value in C++?

Can you explain what pass by value means in C++?

Sure! In C++, pass by value means that a copy of the variable is passed to the function. Changes made to the parameter inside the function do not affect the original variable.

Can you give me an example of pass by value?

Of course! Here's a simple example:

#include <iostream>
using namespace std;

void modifyValue(int num) {
    num += 10;
    cout << "Inside function: " << num << endl;
}

int main() {
    int original = 5;
    modifyValue(original);
    cout << "Outside function: " << original << endl;
    return 0;
}

In this example, original remains 5 outside the function.

What happens if I use pass by reference instead?

If you use pass by reference, the function receives a reference to the original variable. This means any changes made inside the function will affect the original variable.

Are there any advantages to using pass by value?

Yes, pass by value can be safer since it protects the original data from being modified. It's also useful for small data types where copying is inexpensive.