Description: /* 6 the analog calculator program to describe the design of a program to simulate a simple hand-held calculator. Supports arithmetic+,-,*, /, =, and C (Clear), A (all clear) operation. The basic requirements of the program is running, a window, waiting for user input, the user can be calculated from the keyboard input expression, enter the expression in the window, the user type ' =' symbol, the window shows the results. The test data program input of not less than five different expression is tested. Prompted to define a calculator class, including the object of two components, a calculation engine and a user interface, the user interface object accept keyboard input information processing, and display the answer, and perform the corresponding calculation engine object data given operation, and stores the result of the operation. Selected as illegal user input expression can be judged out and gives the corresponding error.* /
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calcultor.cpp
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