意法半导体笔试题和面试题答案

　　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 , staticvariables　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.

　　..........

　　void func(int *p)

　　{...........}

　　..........

　　main()

　　{

　　int num=0;

　　.........

　　func(&num);

　　........

　　}

　　..........

　　Here, the function argument “&num” is passed .

　　a. by value b. by reference

　　III. Practice

　　Create a tree, which has h (h>0) layers, and its each node has w(w>0) sub-nodes.Please complete the following incomplete solution.

　　#include

　　#include

　　struct tree{

　　char info;

　　p_sub; //link to sub-nodes};

　　// allocate memory and initiate

　　void dnode ( struct tree* tmp )

　　{

　　= malloc( sizeof (struct tree) );

　　= 0x41;

　　= NULL;

　　}

　　struct tree *dtree (struct tree* subtree, int height, int width)

　　{

　　int i;

　　if ( !subtree ) //if necessary, allocte memory for subtree

　　denode(subtree);

　　if ( height == 1 )

　　return subtree;

　　else if ( height == 2 ) {

　　struct tree *leaf = NULL;

　　for ( i=0; i

　　denode ( );

　　;

　　leaf = NULL;}

　　return subtree;}

　　else {

　　for ( i=0; i

　　}

　　return subtree;

　　}

　　}

　　main()

　　{

　　.........

　　struct tree *root = NULL