Interactive assignments

An interactive assignment is the following command:

With eukleides, variable x is simply set to number y. With xeukleides, it allows, while viewing, to modify the value of the numerical variable x using the arrow keys. The initial value of x is y, the increment is z. The optional parameters x' and x" are the lower and upper bounds of x. The string str has to contain one uppercase letter. To modify x, one has to press first the corresponding key (at the beginning, the default state is A). The permitted values of f are right (in this case, x will be incremented by pressing the right arrow key and decremented by pressing the left arrow key) or up (in this case, x will be incremented by pressing the up arrow key and decremented by pressing the down arrow key).



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