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Sequence Operator

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

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

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 three primary uses:

  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

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.

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