a test for the c programming language

　　i. history

　　1. c was originally designed for and implemented on the (what) operating system on the dec pdp-11, by (who) .

　　2. the most recently approved ansi/iso c standard was issued in (when) , and single line comments notation “//” is or isn’t a feature of c89.

　　ii. syntax and semantics

　　1. in a runtime c program, auto variables are stored in , static variables are stored in , and function parameters are stored in .

　　a. stack b. heap c. neither stack nor heap

　　2. the statement “extern int x;” is a , and the keyword extern is used during .

　　a. variable declaration b. variable definition

　　c. compilation time d. runtime

　　3. there is a complicated declaration: void ( * signal (int, void (*)(int)) ) (int);

　　if a statement “typedef void (*p) (int);” is given, please rewrite this complicated declaration.

　　4. the following code is a segment of c program.