COSC 2425 – Project 1 MUST BE WRITTEN IN ASSEMBLY LANGUAGE ONLY AND MUST COMPILE

Question

COSC 2425 – Project 1 MUST BE WRITTEN IN ASSEMBLY LANGUAGE ONLY AND MUST COMPILE IN VISUAL STUDIO You will write a simple assembly language program that performs a few arithmetic operations. This will require you to establish your programming environment and create the capability to assemble and execute the assembly programs that are part of this course. Your North Lake College student ID number is a 7-digit number. My ID is 2656469. Begin by splitting your student ID into two different values. Assign the three most significant digits to a variable called 'left' and the four least significant digits to a variable called 'right'. You must choose the data type that is appropriate for the range of decimal values each variable can store. You will choose a data type when you define each of the variables in your program. Try to make efficient use of memory. Calculate the sum of the two variables 'left' and 'right'. Store this result in a variable called 'total'. Calculate the positive difference between the variables 'left' and 'right'. Store this result in a variable called 'diff'. Define a character string called 'message' that contains the characters, "Hello world!". Define an array of data type WORD called 'Array' that is initialized to the following values: 1, 2, 4, 8, 16, 32, and 64. Write assembly language code using what you know so far (do not look ahead in the book just yet) to determine the length of 'Array'. Store this value in a variable called 'ArrayLength'. Move the contents of the variable 'left' into the EAX register. Move the contents of the variable 'right' into the EBX register. Move the contents of the variable 'total' into the ECX register. Move the contents of the variable 'diff' into the EDX register. Move the contents of the variable 'ArrayLength' into the ESI register. Call the author's DumpReg routine to display the contents of the registers.

Explanation / Answer

Assembly language:

MOV AL left
MOV BL right
MOV AX AL
MOV EAX BL
MOV ECX EAX
MOV EAX AL
CMP BL
JZ EQV
JC GRT

EQU : SUB EAX BL
MOV EDX EAX
  
GRT : MOV EAX BL
SUB EAX AL
MOV EDX EAX

MOV EBX BL
MOV EAX AL
MOV ESI ArrayLength

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