Introduction - If you have any usage issues, please Google them yourself
C language is used to design a program to help pupils practice mathematics.
A) program first lets users enter ID number (including the first two capital letters and the latter four Arabia numbers), for example: Please input your ID: AB1234.
The program should have the input validation function. After ID has entered correctly, the program prompts the following functional options.
(1) Start a test
(2) Check score
(3) Exit
The Test: program gives 10 mathematical topics, such as:
12 * 3 = 36; 48 +...