How to pass objects to functions in C++?

Question

I am new to C++ programming, but I have experience in Java. I need guidance on how to pass objects to functions in C++.

Do I need to pass pointers, references, or no

Answer 1

The following are the ways to pass a arguments/parameters to function in C++.

1. by value.

// passing parameters by value . . .

void foo(int x) 
{
    x = 6;  
}

2. by reference.

// passing parameters by reference . . .

void foo(const int &x) // x is a const reference
{
    x = 6;  
}

// passing parameters by const reference . . .

void foo(const int &x) // x is a const reference
{
    x = 6;  // compile error: a const reference cannot have its value changed!
}

3. by object.

class abc
{
    display()
    {
        cout<<"Class abc";
    }
}


// pass object by value
void show(abc S)
{
    cout<