Skip to content Skip to navigation

OpenStax-CNX

You are here: Home » Content » Sequence Operator

Navigation

Recently Viewed

This feature requires Javascript to be enabled.

Tags

(What is a tag?)

These tags come from the endorsement, affiliation, and other lenses that include this content.
 

Sequence Operator

Module by: Kenneth Leroy Busbee. E-mail the author

Summary: Outlines the three primary uses of the sequence operator within the C++ programming language.

Note: You are viewing an old version of this document. The latest version is available here.

The sequence (or comma) operator is used to separate items. It has several uses, four of which are listed then demonstrated:

  1. To separate identifier names when declaring variables or constants
  2. To separate several parameters being passed into a function
  3. To separate several initialization items or update items in a for loop
  4. Separate values during the inititalization of an array

Example 1

int pig, dog, cat, rat;

This is often seen in textbooks, but this method of declaring variables is not preferred. It is difficult to quickly read the identifier names.

Example 2

int pig;

int dog;

int cat;

int rat;

This vertical method of declaring variables or constants is preferred.

Example 3

double area_trapezoid(double base, double height, double top);

The data types and identifier names (known as parameters) are separated from each other.

Example 4

for( x = 1, y = 5; x < 15; x++, y--)

In the syntax of a for loop you have three parts each separated by a semi-colon. The first is the initialization area which could have more than one initialization. The last is the update area which could have more than one update.

Example 5

int ages[] = {2,4,6,29,32};

The variable ages is an array of integers. Initial values are assigned using block markers with the values separated from each other.

Content actions

Download module as:

Add module to:

My Favorites (?)

'My Favorites' is a special kind of lens which you can use to bookmark modules and collections. 'My Favorites' can only be seen by you, and collections saved in 'My Favorites' can remember the last module you were on. You need an account to use 'My Favorites'.

| A lens I own (?)

Definition of a lens

Lenses

A lens is a custom view of the content in the repository. You can think of it as a fancy kind of list that will let you see content through the eyes of organizations and people you trust.

What is in a lens?

Lens makers point to materials (modules and collections), creating a guide that includes their own comments and descriptive tags about the content.

Who can create a lens?

Any individual member, a community, or a respected organization.

What are tags? tag icon

Tags are descriptors added by lens makers to help label content, attaching a vocabulary that is meaningful in the context of the lens.

| External bookmarks