Designing, implementing, and calling low-level I/O procedures implementing and using a macro test your own ReadVal and WriteVal procedures for signed

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CS 271  Computer Architecture and Assembly Language Programming Assignment #6

 Objectives:

• Designing, implementing, and calling low-level I/O procedures

• Implementing and using a macro

Problem Definition:

• Implement and test your own ReadVal and WriteVal procedures for signed

• Implement macros getString and displayString. The macros may use Irvine’s ReadString to get input from the user, and WriteString to display

  • getString should display a prompt, then get the user’s keyboard input into a memory location

  • displayString should print the string which is stored in a specified memory

  • readVal should invoke the getString macro to get the user’s string of digits. It should then convert the digit string to numeric, while validating the user’s

  • writeVal should convert a numeric value to a string of digits, and invoke the displayString

macro to produce the output.

• Write a small test program that gets 10 valid integers from the user and stores the numeric values in an array. The program then displays the integers, their sum, and their

• We will be testing this program with positive and negative

Requirements:

1. User’s numeric input must be validated the hard way: Read the user's input as a string, and convert the string to numeric form. If the user enters non-digits other than something which will indicate sign (e.g. ‘+’ or ‘-‘), or the number is too large for 32-bit registers, an error message should be displayed and the number should be

2. Conversion routines must appropriately use the lodsb and/or stosb

3. All procedure parameters must be passed on the system

4. Addresses of prompts, identifying strings, and other memory locations should be passed by address to the

5. Used registers must be saved and restored by the called procedures and

6. The stack must be “cleaned up” by the called

7. The usual requirements regarding documentation, readability, user-friendliness, etc.,

8. Submit your text code file (.asm) to Canvas by the due

Notes:

1. For this assignment, you are allowed to assume that the total sum of the numbers will fit inside a 32 bit register.

2. When displaying the average, you may round down to the nearest For example if the sum of the 10 numbers is 3568 you may display the average as 356.

Example (user input in italics):

PROGRAMMING ASSIGNMENT 6: Designing low-level I/O procedures Written by: Sheperd Cooper

Please provide 10 signed decimal integers.

Each number needs to be small enough to fit inside a 32 bit register. After you have finished inputting the raw numbers I will display a list of the integers, their sum, and their average value.

Please enter a signed number: 156

Please enter a signed number: 51d6fd

ERROR: You did not enter a signed number or your number was too big. Please try again: 34

Please enter a signed number: -186

Please enter a signed number: 115616148561615630

ERROR: You did not enter an signed number or your number was too big. Please try again: -145

Please enter a signed number: 5 Please enter a signed number: +23 Please enter a signed number: 51 Please enter a signed number: 0 Please enter a signed number: 56 Please enter a signed number: 11

 You entered the following numbers:

156, 34, -186, -145, 5, 23, 51, 0, 56, 11

The sum of these numbers is: 5 The rounded average is: 1

Thanks for playing!

Extra Credit:

• 1 point: number each line of user input and display a running subtotal of the user’s

• 3 points: implement procedures ReadVal and WriteVal for floating point values, using the

To ensure you receive credit for any extra credit options you did, you must add one print statement to your program output PER EXTRA CREDIT which describes the extra credit you chose to work on. You will not receive extra credit points unless you do this. The statement must be formatted as follows...

--Program Intro--

**EC: DESCRIPTION

--Program prompts, etc—

Attachments:

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