Main program to test the basic operations, C/C++ Programming

Assignment Help:

The Main program is slightly more complicated and you need to think about the I/O process. First of all, for most applications you do not call the low level routines GetChar and PutChar. They are used by the higher level I/O subroutines that you wrote for reading and writing strings and numbers.

Secondly, you cannot just call an input routine like GetStr or GetNum on its own. Think carefully about what would happen. Let's say at some point in your program you want to read a number from the keyboard and place it in a memory location. Consider the following code fragment:

MyNum: dw

Main:
...
...
call GetNum
mov MyNum1, ax

This code will assemble and run and when you enter a number and press ‘Enter' it will store the number at location MyNum. However, how does the person running the program know when to enter a number, or whether to enter a number or a string? When subroutine GetNum is called it will simply wait for input from the keyboard. But the program gives no indication that it is waiting for input! The simple answer is that you must always first write a string to the screen asking for the kind of input you want the user to enter, then call the appropriate input routine. So, our revised program should look like this:

Prompt1: db ‘Enter a number less than 65536:

MyNum: dw
Main:
...
...
Mov ax, Prompt1
Call PutStr
call GetNum
mov MyNum1, ax

Now when the program runs it first prints a message asking for a number and then waits for input. Try this out - if you have written your routines correctly, I think you will like the way this works.


Related Discussions:- Main program to test the basic operations

Define the object-oriented terms, Question : (a) Define the following O...

Question : (a) Define the following Object-Oriented terms: (i) Encapsulation (ii) Inheritance (iii) Abstraction (iv) Polymorphism. (b) What are objects in Lingo progra

List, Is there any difference between List x; and List x ()? Can you please...

Is there any difference between List x; and List x ()? Can you please provide me assignment help.

Genetic disease, Many human diseases could be controlled by the knowledge o...

Many human diseases could be controlled by the knowledge of the gene’s structure and pattern. The human gene could be represented by four nucleotides. Each nucleotide is represente

UltimateCarRadio Project, In this assignment, you will be modifying your As...

In this assignment, you will be modifying your Assign-05 code to use more inheritance. As well, in this assignment, you will be asked to use newand delete, throw and catch except

C++ program, Receive 3 numbers and display them in ascending order from sma...

Receive 3 numbers and display them in ascending order from smallest to largest ed#

C pgms, find area under the curve y=f(x) between x=a &y=b integrate y=f(x)

find area under the curve y=f(x) between x=a &y=b integrate y=f(x)

Program to calculate gross pay and tax payable, Study the following table u...

Study the following table used to compute the tax payable by employees in certain organization   Gross Pay                                  Fewer than Three             Three

C++, Write C++ code for calculating the time table

Write C++ code for calculating the time table

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