这是我完善的上一版本的计算器。主要功能是计算四则运算和三角运算。三角运算为直接的角度计算。程序简单 易懂最最适合初学者参考的了今天上传与大家分享-This is my sound on a version of the calculator. Main function is to calculate the four operations and trigonometric equations. Trigonometric equations for direct calculation of