Application for build a toy program, C/C++ Programming

With this assignment you will build a toy program that manipulates pointers to integers. You will develop the same main program fragment in both C and Assembler. Thus, you'll get two homeworks from this exercise, HW3-A and HW3-B.

The main ideas in these assigments are to understand the array-pointer duality in C and understand the relationship between pointers and addressing in assembly.

Getting Started

Here is a template C program to get you started. You'll need to fill in the blanks to complete.

#include

#define SZ 7

int* a[SZ];

int x, y, z;

void populate() {

  x = 1;

  y = 2;

  z = 3;

  a[0] = &x;

  a[1] = &y;

  a[2] = &z;

  a[3] = a[0];

  a[4] = a[1];

  a[5] = a[2];

  a[6] = a[3];

}

void printall() {

  int i;

  for (i = 0; i < SZ; i++) {

    printf("a[%1d]=%1d, ", i, *(a[i]));

  }

  printf("x=%1d, y=%1d, z=%1d\n", x, y, z);

}

void add1each() {

  // FILL THIS IN

  // For HW4-A use C

  // For HW4-B use GAS assembly.

}

int main(int argc, char* argv[]) {

  populate();

  printall();

  add1each();

  printall();

  return 0;

}

Running

When this program runs, main() calls populate() to initialize the values for global variables, x, y, z, and the pointers in the array, a. Here is a diagram (that you'll need to complete) of those global variables.

HW4-A Instructions

1. Complete the diagram by filling in the lines representing pointer values.

2. Implement the body of the function add1each() in C. The function should add one to each referenced element of the array. Note that some elements are shared so will be incremented more than once.

3. Compile and run your program using the following, ?% script

4. Script started, file is typescript

5. % ./hw4a

6. a[0]=1, a[1]=...

7. a[0]=...

8. % exit

9. Script done, file is typescript

10. ??When you are done, the file typescript will contain a transcript of everything you typed with computer's responses.

Submit

For HW4-A, submit three things:

  • Your diagram with pointers. This can be a PNG file--take a picture of your drawing, or an MS Word document or an SVG document from a drawing tool like Inkscape.
  • Your C program file.
  • Your typescript file.
  • Do not submit ".o" files, nor the executable file
  • Do not submit any other write-ups as MS word documents or any other write-ups, as the grader will just throw these away. If you need comments put them into your source code.

 

HW4-B Instructions

Implement the function add1each() using GAS in-line Assembly. You will want to pay particular attention to addressing modes used for operands.

The implementation of add1each() using GAS should perform exacly the same pointer dereferencing as your C program. Thus, when run, your GAS program should produce exactly the same results as with the C program. To verify this, save the session from the C program, run the GAS program and "diff" the results.

% cp typescript typescript-a

% script

Script started, file is typescript

% ./hw4b

a[0]=1, a[1]=...

a[0]=...

% exit

Script done, file is typescript

% diff typescript typescript-a

If no differences are reported then the output of the two programs exactly matches.

Submit

For HW4-B, One file containing:

  • Your C program file with in-line assembly implementation of add1each().
  • Do not submit ".o" files, nor the executable file
  • Do not submit any other MS word documents or any other write-ups, as the grader will just throw these away. If you need comments put them into your source code.


Posted Date: 3/4/2013 7:34:19 AM | Location : United States







Related Discussions:- Application for build a toy program, Assignment Help, Ask Question on Application for build a toy program, Get Answer, Expert's Help, Application for build a toy program Discussions

Write discussion on Application for build a toy program
Your posts are moderated
Related Questions
palindrome program with minimum character replacements

Consider a group of n robots, numbered R2D1 through R2Dn, and m tasks, numbered 1 through m. Tasks can be different and robots are specialized, hence a given robot can only perform

A: A reference has to always refer to some object and, so, must always be initialized; pointers do not have such limits. A pointer may be reassigned to point to distinct objects wh

Implement the search property from catalogue menu option.  After selecting this option the user should be asked to specify the property using the following sub-menu: 1. Specif

Program to design text styles: Write a C program to design different text style char *fname[] = { "DEFAULT font",                                   "TRIPLEX font",

Given an integer n and a permutation of numbers 1, 2 ... , n-1, n write a program to print the permutation that lexicographically precedes the given input permutation. If the given

Write a function that computes f(x) for a quadratic polynomial in x, such as the one in assignment 3. Use the function to plot f(x) from -10 to +10.

•Flow Chart and Pseudocode of Add module - Hotel booking - Signup for new membership Delete module - Hotel reservation cancellation - Change of reservation

solve for radius(R) of a circle of its area is to be inputted by a user. also display compute the circle diameter hint: area= pir21 pi=2.1416

Hi, I need quick sort program without using recursion