Passing by Reference

All right, in this lesson we are going to start using a different method of utilizing values in variables.

So far we have been passing information by Value.

int num = 0;

The example of above is passing information by value. We simply put a number into a variable and then use it for whatever purposes we have designed for it.
In this lesson we have a new way of putting a value into a variable. It is called passing by Reference.

Watch the video for further explanation

Passing by reference Video

So Here is the assignment

We need a very specific function and we need it ASAP.
This is how we imagine it:

its name is "increment";
it returns void;
when invoked with one argument (an int variable),
it simply increments the variable by 1;
when invoked with two arguments (an int variable and int expression),
it increments the variable by the expression's value.

Sorry, we cannot show you the function's header – it would be too easy.

We'll only show you how we invoke the function – the rest is up to you.

Complete the code below.

Run your code and check whether your output is the same as ours.

Sample code

#include

using namespace std;

// Insert your function here

int main(void)
{

  int var = 0;
  for(int i = 0; i < 10; i++)
  if(i % 2) // increment by 1 on odd numbers
increment(var); // i=1 var=1, i=3 var=4, i=5 var=9, i=7 var=16, i=9 var=25
  else // increment by i on even numbers
   increment(var,i); // i=0 var=0, i=2 var=3, i=4 var=8, i=6 var=15, i=8 var=24

  cout << var << endl;
return 0;

}