设计一个简单计算器，在“操作数”标签右侧的两个文本框输入操作数，当单击操作符＋，－，×，÷按钮时，对两个操作数进行运算并将结果填入到“结果”标签右侧的文本框中。-The design of a simple calculator, in" operand" label on the right side of the two text box input operands, when you click the operator+,-, x, a button, the two operand operation and the results in the" results" to the right side of the label　s text box.