设计的计算器应用程序可以完成加法、减法、乘法、除法和开方，次幂运算。且有小数点、正负号、清空、清除以及一定的错误处理等功能。用鼠标单击相应的数字键和运算符号键，然后单击“=”号按钮，窗口上方的文本框将会显示计算出来的结果，要将文本编辑框清空，可单击清空按钮。-Calculator application designed to be completed addition, subtraction, multiplication, division and square root, sub-power computing. And a decimal point, sign, clear, clear, and some error handling functions. Right click the appropriate number keys and operator symbols key, and then click the " ="　number button, the window above the text box will be displayed calculated results to a text edit box empty, click the Clear button.