Pass an object to a function : object parameters « Function « C++ Tutorial

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C++ Tutorial » Function » object parameters 
7.5.1.Pass an object to a function
#include <iostream> 
using namespace std; 
 
class MyClass 
  int i; 
public
  MyClass(int i) { 
    i = i; 
  
 
  int getI() { return i; 
  void setI(int i) { i = i; 
}
 
void display(MyClass ob

  cout << ob.getI() << '\n'

 
void change(MyClass ob

  ob.setI(100)// no effect on argument 
 
  cout << "Value of ob inside change(): "
  display(ob)

 
int main() 

  MyClass a(10)
 
  cout << "Value of a before calling change(): "
  display(a)
 
  change(a)
  cout << "Value of a after calling change(): "
  display(a)
 
  return 0
}
Value of a before calling change(): 2
Value of ob inside change(): 2
Value of a after calling change(): 2
7.5.object parameters
7.5.1.Pass an object to a function
7.5.2.Constructors, destructors, and passing objects
7.5.3.Copy constructor invoked when passing an object to a function
7.5.4.Passing pointers to objects
7.5.5.Data slicing with passing by value
7.5.6.Passing Objects to Functions
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