### Add Expressions and Variables to a Monitor

From the Source window, you can add a variable or expression to a monitor, so that you can keep track of how the variable's contents or the expression's value changes during program execution. You can use any of the following methods:

- Position the pointer over the variable, click mouse button 2 [note], and select the monitor you want from the popup menu.
- Highlight the variable or expression, then select Monitors->Monitor expression. A dialog opens containing the variable or expression; select a monitor from there.
- Select Monitors->Monitor expression. In the dialog, enter the variable or expression and choose a monitor.
- Double-click on a variable to add it to the Program monitor.

Supported C++ expressions