Runtime errors

A runtime error occurs:

Whenever the program instructs the computer to do something that it is either incapable or unwilling to do.

There are a near infinite number of ways to write programs that cause runtime errors.

Alice runtime errors commonly occur:

• When statements are written in the wrong order, or
• The order is modified by dragging statements up and down the screen after they are written.

Another common cause of runtime errors results from:

Construction of instructions that the computer is unable to carry out.