正通密码键盘驱动程序ZT598,下载主密钥，工作密钥，mac运算，加解密等功能-Looking for the password keyboard driver ZT598, download master key, working key, mac operation, encryption and decryption functions

功能齐全的计算器可以实现加减乘除运算，在eclipse下开发的java应用程序。-Fully functional calculator arithmetic operations can be achieved, in eclipse java application development.

计算器加减乘除开方等运算！与电脑上的计算器极为相似，而且是运用JS制作的！有易于参考！-Square root calculator, Math and other operations! Calculators and computers are very similar, and is produced using JS! Have easy reference!

利用函数和递归做一个数列的加减运算，数列的加减运算有一定的规律，可利用函数与计算出结果-The constant  can be calculated by the infinite series:  = 4- 4/3+ 4/5- 4/7+ 4/9- 4/11+.... Write a C program that uses a do/while loop to calculate  using the series. The program