Fix problems
By default, CLion analyses the code in all open files and highlights the detected code issues. You can fix most of the issues immediately by applying quick-fixes.
Place the caret at the highlighted piece of code and press Alt+Enter: 
You can also hover the mouse over the highlighted element and apply a quick-fix from the inspection popup: 
For some inspections, you can open a preview by pressing Ctrl+Shift+I.
If you perform code analysis or execute a single inspection in a larger scope of source files, CLion displays the detected code issues in the Problems tool window. When you select a specific issue in this window, its report is shown in the right part of the window.
Apply quick-fixes from inspection results
In the Problems tool window, select the issue and do one of the following:
If CLion suggests any fixes to the issue as described above, you can use one of them to fix the problem immediately:
You can also batch-apply quick fixes for several issues at a time. Click Fix partially in the results description tab:
Alternatively, you can select several issues and choose a proper quick-fix from the context menu.
If no resolutions are suggested, use the command in the context menu and fix the problem manually.