### 15.3 Type and Range Checking

> Warning: In this release, the gdb commands for type and range checking are included, but they do not yet have any effect. This section documents the intended facilities.

Some languages are designed to guard you against making seemingly common errors through a series of compile- and run-time checks. These include checking the type of arguments to functions and operators, and making sure mathematical overflows are caught at run time. Checks such as these help to ensure a program's correctness once it has been compiled by eliminating type mismatches, and providing active checks for range errors when your program is running.

gdb can check for conditions like the above if you wish. Although gdb does not check the statements in your program, it can check expressions entered directly into gdb for evaluation via the `print` command, for example. As with the working language, gdb can also decide whether or not to check automatically based on your program's source language. See Supported Languages, for the default settings of supported languages.