9.5: Exercises
- Page ID
- 19915
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)Below are some quiz questions and suggested projects based on this chapter.
Questions
Below are some quiz questions based on this chapter.
- Which register refers to the top of the stack?
- What happens as a result of a push rax instruction (two things)?
- How many bytes of data does the pop rax instruction remove from the stack?
- Given the following code fragment:
mov r10, 1
mov r11, 2
mov r12, 3
push r10
push r11
push r12
pop r10
pop r11
pop r12
What would be in the r10 , r11, and r12 registers after execution? Show answer in hex, full register size.
- Given the following variable declarations and code fragment:
lst dq 1, 3, 5, 7, 9
mov rsi, 0
mov rcx, 5
lp1: push qword [lst+rsi*8]
inc rsi
loop lp1
mov rsi, 0
mov rcx, 5
lp2: pop qword [lst+rsi*8]
inc rsi
loop lp2
mov rbx, qword [lst]
Explain what would be the result of the code (after execution)?
- Provide one advantage to the stack growing downward in memory.
Suggested Projects
Below are some suggested projects based on this chapter.
- Implement the example program to reverse a list of numbers. Use the debugger to execute the program and display the final results. Create a debugger input file to show the results.
- Create a program to determine if a NULL terminated string representing a word is a palindrome(For more information, refer to: http://en.Wikipedia.org/wiki/Palindrome). A palindrome is a word that reads the same forward or backwards. For example, “anna”, “civic”, “hannah”, “kayak”, and “madam” are palindromes. This can be accomplished by pushing the characters on the stack one at a time and then comparing the stack items to the string starting from the beginning. Use the debugger to execute the program and display the final results. Create a debugger input file to show the results.
- Update the previous program to test if a phrase is a palindrome. The general approach using the stack is the same, however, spaces and punctuation must be skipped. For example, “A man, a plan, a canal – Panama!” is a palindrome. The program must ignore the comma, dash, and exclamation point. Use the debugger to execute the program and display the final results. Create a debugger input file to show the results.