Write a program to input an address, Computer Engineering

Assignment Help:

  Write a program to input an address i.e. 20 Hex and read the byte (char) contents of that address  

Answer
 
include
void main()
{
char prompt;

Date: 26th August 2012

Version 1.0  
Function : To read an address in memory       
 Modifications:   none*/
unsigned long int address;
unsigned char *add;
unsigned char data;
printf("Please enter in the address  you want to read\n\r");
scanf("%lx",&address);
add = (unsigned char *)address;
data = *add;
printf("The data at the address %08lx is %02x\n\r",address,data);  
printf("Press and key to exit \n\r");
scanf("\n%c",&prompt);
 
}
  
Note: Care should be taken since some operating systems do not allow the user to read any memory address. The PC environment is one of these in that the PC runs under protected memory and hence looking at memory outside this area can yield 'General protection errors '. In order to access the memory in a PC, the operating system must tag the memory area for common use by the program. This is usually achieved by either writing a windows driver for the hardware/address or my poking in an allocated area i.e. allocating static space by an array or using malloc to reserve bytes of area.


Related Discussions:- Write a program to input an address

What are universal gates, What  are  universal  gates.  Construct  a  lo...

What  are  universal  gates.  Construct  a  logic  circuit  using  NAND  gates  only  for  the expression x = A . (B + C). Ans. Universal Gates: NAND and NOR Gates both are t

Cache-only memory access model (coma), Cache-Only Memory Access Model (COMA...

Cache-Only Memory Access Model (COMA) As we have discussed previous, shared memory multiprocessor systems may use cache memories with each processor for deducting the execution

Short notes on model primitives in director mx 2004, Question: (a) Prep...

Question: (a) Prepare short notes on the model primitives in Director MX 2004. (b) Therefore using the box primitive write codes to prepare a new model resource of length 50

Illustrate working of asynchronous counters, Q. Illustrate working of Async...

Q. Illustrate working of Asynchronous Counters? This is more frequently referred as ripple counter as the change that takes place in order to increment counter ripples through

Define bus, Define bus A group of lines that serves as a connecting pat...

Define bus A group of lines that serves as a connecting path for various devices is known as a bus.

Explain the action of an interrupt processing routine, Explain the action o...

Explain the action of an interrupt processing routine? Action of an interrupt processing routine is as follows : 1. Save contents of registers of CPU. This action is not e

Determine 127.0.0.1 is which type of address, 127.0.0.1 is a? 127.0.0.1...

127.0.0.1 is a? 127.0.0.1 it is a loop-back address.

Show the responsibilities of session layer, Q. Show the Responsibilities of...

Q. Show the Responsibilities of session layer? Session layer: Main functions of this layer are to establish, synchronize and maintain the interaction between two communicatio

Example of structural hazards - computer architecture, Example of Structura...

Example of Structural hazards - computer architecture: A machine has shared a single-memory pipeline for instructions and data. As a consequence, when an instruction which con

What are the benefits of micro programmed control, a. What are the benefits...

a. What are the benefits of hardwired and micro programmed control? b. Sketch neat diagram of single bus organization of CPU showing ALU, all types of registers and the data pat

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd