To Add X Y Z co-ordinates to point shapefile

1. Create a point shapefile and add points to it.
2. Add created shape file in Arcmap.
3. Open its attribute table.
4. Add field – given name and select double as its Format.
5. Right click on the added Field and select Calculate geometry
6. Select in the given field X-co-ordinate or y-co-ordinate as desired.
7. Repeat for second coordinate
8. To add Z-co-ordinate you need DEM of that area; add DEM to Arcmap
9. Use extract values to point tool in spatial analyst tool to add Z-co-ordinate
10. Select input raster as DEM.