Here are two samples that show how to add points to a map programmatically
https://developers.arcgis.com/en/javascript/jssamples/graphics_svg_path.html
https://developers.arcgis.com/en/javascript/jssamples/map_topo_graphics.html
i copied the coordinates from google map . can to defined how can i convert them for arcGIS map.
What are the coordinates that you're putting in? Are they latitude/longitude coordinates or in another projection?