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Calc only has an interactive shell and cannot load files.
Here is a record of an interactive session.
calc_var -- programming languages zoo
Type Ctrl-D to exit
calc_var> 2+2
calc_var> x=10
calc_var> y=x+20
calc_var> 3 * x + 7
calc_var> z
Error: unknown variable z
calc_var> x=20
calc_var> x + y
calc_var> x / 0
Error: division by zero