Because it's often easier to address pixels/cells directly than to use Windows Forms or something similar, it's very often simpler to manipulate raw pixel data directly.
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This program uses the transformation from infix notation to postfix notation to evaluate most mathematic expressions. It supports most operators (+,-,*,/,%,^), functions from 0 to any number of parameters, and also a user-defined function by using delegate. It also supports variables in the expression. It will generate a symbol table that can be updated at run time. Also. this program demonstrates the use of the DataGrid as a normal grid without any database connection.
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