DOS界面下的登录程序，C语言写的，主要练习win32程序的密码用*号显示，输入错误可以回退删除等-Login program under DOS interface, C language, passwords major exercises with an asterisk win32 program display, input errors can be rolled back and delete. . .

recieve data from Asterisk by telnet,and analyses process.

Exercise 5: ‘for’ and ‘do … while” repetition statements 1. ​Write a program which uses a do/while loop to print out the first 10 powers of 2 other than 0 (ie. it prints out the values of 21, 22, ..., 210). Use a for loop to do the same. 注意 po