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Sequence Operator

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

Summary: Outlines several 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.

General Discussion

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

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

int pig, dog, cat, rat;

The following vertical method of declaring variables or constants is preferred.

Example 1: Preferred Vertical Method of Defining Variables


int  pig;
int  dog;
int  cat;
int  rat;

The data types and identifier names (known as parameters) are separated from each other. This example is a function prototype.

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

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. Mutiple initializations or updates use the comma to separate them. This example is only the first line of a for loop.

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

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

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

Definitions

Definition 1: sequence
An operator used to separate multiple occurrences of an item.

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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?

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Who can create a lens?

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What are tags? tag icon

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