Weekly Quiz Analysis Summary

Quiz One:

 fill in the blanks: all the default system user names and Passwords are (Shiyanlou) in the lab building environment. Fill in the blanks: in Linux bash, CTRL + A shortcut key is (move the cursor to the input outfit, equivalent to the home key). Judgment: The man printf and man 1 printf functions are equivalent in Linux bash. OK fill in the blanks: in Linux You can use the (groups) command to know which user groups you belong to. Fill in the blanks: in Linux You can use the (chmod) command to modify a file's permissions. Fill in the blanks: Linux does not have C drive, D drive, its file system directory is set by (FHS) standard. Judging: In Linux Bash, CD-commands can be switched to the ' home ' directory. X should be CD ~, CD-Switch to previous directory: in Linux Bash, the command to force delete test files is (rm-f test). Judgment: the Cat-n and NL command functions are equivalent in Linux bash. OK to judge: Linux Bash, source and. The command function is equivalent. OK fill in the blanks: in Linux Bash, the command to find files created in the home directory the day before yesterday is (find ~-ctime 2). Distinguish 2 +2-2 significance, three kinds of time reference study elder sister Li Bing Qing's research judgment: in Linux bash, the command that uses the TAR command to package the home directory into Home.tar is (TAR-CF home.tar ~) Fill in the blanks: the ZIP command uses (-e) in Linux bash parameter to create an encrypted compressed package. Judgment: the DF and du command functions are equivalent in Linux bash. X-fill: ls in Linux bash. | The function of the Sort command is (show current directory contents and sort) fill in the blanks: in Linux bash, use grep to find the command in that file for the main function in *.C in the current directory (grep main *.c) in the blanks: Linux bash, The command that uses the WC statistic hello.c a few lines of code is (Wc-l hello.c) judgment: The-H parameter of the col command can be used to build the tab to the equivalent number of spaces. x, Space tab fill in the Blanks: Linux bash, the LS command displays the results of the current directory ls.txt command output redirect command is (ls > ls.txt) fill in the blanks: in Linux bash, the (tee) command can be redirected to multiple files at the same time. 

quiz two:

Man-k fill in the blanks: there is a linear lookup algorithm in the data structure, the C standard library does not have this function function, but in Linux, this function is (lfind or lsearch) cheat fill in the blanks: to list the content of/path/to/foo.tgz Archive using tar (tar-jtvf/path/to/foo.tgz) Find the Fill: Find command for all directories under the current directory is (find. -type d) grep fill in the blanks: the command to find the value of a macro Stdin_fileno is (grep-nr xxx/usr/include) CH01 fill in the blanks: all information in a computer system is a bit-string representation, so-called (information) is a bit + context. CH01 fill in the blanks: the main idea of the memory hierarchy is that the upper memory is used as the underlying memory (cache). CH01 fill in the blanks: the most basic four abstractions in the operating system are (virtual machines, processes, virtual storage, files). CH07 fill in the blanks: the two main tasks of the linker are (symbolic parsing and relocation). CH07 selection: Textbook p449 in Swap.c BUFP1 is (a) a global symbol B external symbol c local symbol D above is not the CH07 judgment: C language, global variables are strong symbols. (X) CH07 fill in the Blanks: (loader) Map the contents of the executable file to the memory and run the program. CH07 selection: In Linux, disassembly. The binary instruction in the text section uses a tool that is (d) A ar B strings C readelf D objdump Code title: 1. In VI, the commands for viewing the scanf and printf man pages (Help document) are respectively? (2 min) K 3k2. commands to compile and run the above code (2 points) gcc *.c-o main./main3. Debug the above code with GDB: What is the command to compile the code? How do I set a breakpoint for the main function in MAIN.C? How do I set breakpoints on line sixth? (3 points) Gcc-g *.c-o main B main B 64. In addition to MAIN.C, the other 4 modules (ADD.C SUB.C mul.c div.c) of the source code does not want to give others, how to make a mymath.a static library? Main.c How to use MYMATH.A? (3 points) gcc-c add.c sub.c mul.c div.car rcvs libmymath.a add.o sub.o mul.o div.ogcc main.c-o main-l.-lm Ymath (or GCC main.c./libmymath.a-o main) 5. In addition to MAIN.C, the other 4 modules (ADD.C SUB.C mul.c div.c) of the source code does not want to give others, how to make a mymath.so shared library?  Main.c How to use mymath.so? (4 points) gcc-fpic-c add.c sub.c mul.c div.cgcc-shared-o libmymath.so add.o sub.o MUL.O div.ogcc-o Main Main.c-l.-lmymathlibmymath.so to be copied to/lib Or/usr/lib6. Write out the makefile to compile the above code, compile the target file is Testmymath, only with explicit rules can. (4 points) testmymath:main.o add.o sub.o mul.o div.o gcc main.o add.o sub.o m UL.O div.o-o testmymathmain.o:main.c head.hgcc-c main.cadd.o:add.c head.hgcc-c add.csub.o:sub.c head.hgcc-c SUB.CMU L.O:MUL.C head.hgcc-c mul.cdiv.o:div.c head.hgcc-c div.c

quiz three:

Man-k fill in the blanks: the command to display file attributes (status) in Linux is (stat) cheat fill in the blanks: commands that use the DU command to sort directories or files under the current directory are (Du-sk *| sort-rn) grep in the blanks: ~/test Folder has a lot of C source files, find the main function in which file of the command (grep main *.c) VI fill in the blanks: VI View the function qsort the shortcut key for the Help document is (K) gdb judgment: GdB in the next and step can be single-step tracking, Priority should be given to step based on the top-down principle. (X) ch01 fill in the blanks: abstraction is an important concept in CS, and in the out-of-box, the (instruction set structure) provides an abstraction of the actual processor. CH01 selection: Three levels in parallel do not contain (C).  A thread-level concurrency B instruction-level parallel C process-level concurrency D SIMDch07 fill in the blanks: gcc-f pic xxx.c in pic means (location-independent code or position-independent code) 2.4 Fill in the blanks: Calculate 0x503c + 100  = (0x50a0), the result is a 16 binary representation 2.6 Fill in the blanks: Exercise 2.6 matches the binary total 21 bits, the 16 notation is (0x159141) 2.8 Fill in the blanks: A, b length is a byte, a=1,b=6, a|b = (7 or [00000111]) 2.11 Judgment: The code in line fourth "<=" replaced by ">=" can solve the code problem. (X) 2.13 judgment:/*compute X&y, only calls to functions bis and bic*/int bool_and (int X, int y) {int result = BIC (X, y); re turn result;} (X) 2.14 Fill in the blanks: A, b length is a byte, a=1,b=6, a| | b = (1 or true) 2.18 fill in the blanks: 16-bit machine, complement 0x8004 conversion equivalent decimal is (-2044) 2.19 judgment: T2u4 ( -8) + 8 = + (OK) 2.21 judgment: C: -2147483647-1u &lt ; -2147483647 (OK) 2.23 fill in the blanks: fun2 (0xed005380) = (0xffffff80) 2.24 fill in the blanks: four digits 0xC truncated to 3 digits, and the truncated value interpreted as an unsigned number is(4) 2.25 judgment: Code for medium condition i<= (int) length-1 can eliminate program bug (OK) 2.27 Judge: function code can be ruturn x+y >= y; (OK) 2.29 fill in the blanks: [11000] + [11000] = ([110000]) 2.33 fill in the blanks: for four-digit complement 8, the complement of the non-representation of the decimal is (-8) 2.34 fill in the blanks: complement [100] * [101] = ([001100]) 2.40 fill in the blanks: K=31 Shift 2, plus/minus 1, expression ((x<<5)-X) 2.44 judgment: for title: (x>0) | | ((x-1) <0) The value is True (x) 2.45 fill in the blanks: binary decimal 1.101 is converted to decimal (1.625) 2.47 judgment: floating-point number 00111 is converted to decimal for 1.5 (x) 2.50 Fill in the blanks: binary number 10.110 rounds to the nearest One-second decimal value for (2.5) 2.54 judgment: f==-(-f) (OK)

Test Four:

Regex judgment: The regular expression r.t can match Rt. (x) Regex judgment: the regular R-expression zo* can match Z. (OK) CH03 fill in the blanks: starting with I386, the x86 architecture expands to 32 bits, adding a (flat) addressing mode CH03 fill in the blanks: on 64-bit machines, to compile 32-bit machine code with GCC, you need to use the (-m32) option to CH03 the blanks: for machine-level programming, Two important abstractions are (ISA, virtual address) CH03 fill in the blanks: in Linux, the command to disassemble the target code CODE.O is (objdump-d code.o) CH03 fill in the blanks: the three types of operands in the IA32 instruction are (immediate count, register, memory) 3.1 Fill in the blanks: for the figure in Exercise 3.1, the value of operand 8 (%eax,%ecx,4) is (0x11) CH03 judgment: Copy the word in memory where the address is 0x4050 to 0x405c (MOVW), ($0x4050) (x) $0x405c Judgment: The value of%esp is 0x10c, PUSHL%eax,%esp value is 0x108. (OK) 3.3 judge: Movb $0xf, (%eax) is the correct assembly statement. (OK) 3.5 fill in the blanks: the function of the DECODE1 function is (data exchange) 3.6 fill in the blanks: Instruction Leal 3 (%eax,%ecx,4),%edx the value stored in%edx is (3+X+4Y) 3.9 Fill in the blanks: the function of the Arith function is (~ (x^y) ; >3)-Z) 3.14 judgment: The assembly code does not log the type of the program value. (OK) CH03 fill in the blanks: conditional expressions in C are combined (conditional jumps and unconditional jumps) in the assembly. CH03 fill in the blanks: the loop structure in C can be implemented with (conditional test and jump combination). CH03 Select: Stack Used (ABCD) A to pass the parameter B to store the return information C save Register D local storage. CH03 fill in the blanks: in the Linux assembly, the statement that forms the stack frame for air conditioning is (push%ebp movl%esp%ebp) CH03 fill in the blanks: in the Linux assembly, the function has a return value in the presence (%EAX) register.

　　

Weekly Quiz Analysis Summary