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Double-click the J icon to start J. The session opens with a window labeled n.ijx (for example, 1.ijx).

The ijx window is an execution window. You type J sentences into the ijx window and J executes them when you press enter and displays the result.

Type the following line into the ijx window and press Enter.

   2 + 3
The sentence is executed and the result is displayed. Type the following line and press Enter.

   5 - 3
Your session should look something like this:

   2 + 3
5
   5 - 3
2
Lines you enter are indented three spaces and the J answers start at the margin.
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