# Command Reference

## The File Menu

&Ctrl;Q File Quit

  Quit &kcalc;.

## The Edit Menu

&Ctrl;Z Edit Undo

  Go back in the result stack.

&Ctrl;&Shift;Z Edit Redo

  Go forward in the result stack.

&Ctrl;X Edit Cut

  Delete the displayed result and copy it to the clipboard.

&Ctrl;C Edit Copy

  Copy the displayed result to the clipboard.

&Ctrl;V Edit Paste

  Insert the cut or copied result in the display.

## The Constants Menu

Constants Mathematics

  Display Pi, Euler Number or Golden Ratio.

Constants Electromagnetism

  Display Light Speed, Elementary Charge, Impedance of Vacuum, Permeability of Vacuum or Permittivity of Vacuum.

Constants Atomic & Nuclear

  Display Planck's Constant, Elementary Charge or Fine-Structure Constant.

Constants Thermodynamics

  Display Boltzmann Constant, Atomic Mass Unit, Molar Gas Constant, Stefan-Boltzmann Constant or Avogadro's Number.

Constants Gravitation

  Display Constant of Gravitation or Earth Acceleration.

## The Settings Menu

Settings Science/Engineering Buttons

  Display science and engineering buttons.

Settings Statistic Buttons

  Display statistic buttons.

Settings Logic Buttons

  Display logic buttons.

Settings Constants Buttons

  Display constants buttons.

Settings Show All

  Display all buttons available.

Settings Hide All

  Hide all extra buttons and display only standard default buttons.

Settings Configure Shortcuts...

  Configure the keyboard shortcuts used by &kcalc;.

Settings Configure &kcalc;...

  Display the &kcalc; settings dialog.

## The Help Menu

&help.menu.documentation;