TITLE Assignment1 (Assignment1.asm) ; Author: Tan Ton ; Last Modified: 07/03/2022 ; OSU email address: [email protected] ; Course number/section: CS271 ; Assignment Number: 1 Due Date: 07/03/2022 ; Description: ; include the irvine library INCLUDE Irvine32.inc ;Data section declare all the variables .data ;Intro and message UserName BYTE " Tan Ton", 0 Assignment1 BYTE " Welcome to Assignment 1", 0 instructions BYTE " Please Enter 2 numbers, Program will Calculate the sum, difference, product, (integer) quotient and remainder of the numbers.", 0 FirstNumShow BYTE " First Number: ", 0 SecondNumShow BYTE " Second Number: ", 0 ErrorInput BYTE " Please ENTER Second Number smaller then the First Number ", 0 ByeBye BYTE " Awesome, Thanks for using the program, Bye ",0 ;Requirement sign need to show and input FirstNumber DWORD ? ;user input integer1 SecondNumber DWORD ? ;user input integer2 EqualSign BYTE " = ", 0 sum DWORD ? sumsign BYTE " + ",0 difference DWORD ? diffsign BYTE " - ",0 product DWORD ? Productsign BYTE " * ",0 quotient DWORD ? quotientsign BYTE " / ",0 remainder DWORD ? Numberofremainder BYTE " remainder ",0 .code main PROC ;Assignment Title mov edx, OFFSET Assignment1 call WriteString call CrLf ;UserName mov edx, OFFSET UserName call WriteString ;Instruction mov edx, OFFSET instructions call WriteString call CrLf call CrLf ;FirstNumber Input mov edx, OFFSET FirstNumShow call WriteString call ReadInt mov FirstNumber, eax call CrLf ;SecondNumber Input mov edx, OFFSET SecondNumShow call WriteString call ReadInt call CrLf mov SecondNumber, eax ;compare the number ;if the second number is grater than first number ;then jump to Error ;if notm jump to calculation mov eax, SecondNumber cmp eax, FirstNumber jg Error jle Calculation Error: ;print the error message mov edx, OFFSET ErrorInput call WriteString call CrLf ;jump to endProgram jg endProgram Calculation: ; find the sum mov eax, FirstNumber add eax, SecondNumber mov sum, eax ; find the difference mov eax, FirstNumber sub eax, SecondNumber mov difference, eax ; find the product mov eax, FirstNumber mov ebx, SecondNumber mul ebx mov product, eax ; find the quotient mov eax, FirstNumber mov ebx, SecondNumber div ebx mov edx, 0 mov quotient, eax mov remainder, edx ; Print Sum mov eax, FirstNumber call WriteDec mov edx, OFFSET sumsign call WriteString mov eax, SecondNumber call WriteDec mov edx, OFFSET EqualSign call WriteString mov eax, sum call WriteDec call CrLf ; Print Difference mov eax, FirstNumber call WriteDec mov edx, OFFSET diffsign call WriteString mov eax, SecondNumber call WriteDec mov edx, OFFSET EqualSign call WriteString mov eax, difference call WriteDec call CrLf ; Print Product mov eax, FirstNumber call WriteDec mov edx, OFFSET Productsign call WriteString mov eax, SecondNumber call WriteDec mov edx, OFFSET EqualSign call WriteString mov eax, product call WriteDec call CrLf ; Print Quotient and remainder mov eax, FirstNumber call WriteDec mov edx, OFFSET quotientsign call WriteString mov eax, SecondNumber call WriteDec mov edx, OFFSET EqualSign call WriteString mov eax, quotient call WriteDec mov edx, OFFSET Numberofremainder call WriteString mov eax, remainder call WriteDec call CrLf endProgram: ; Print Goodbye mov edx, OFFSET ByeBye call WriteString call CrLf exit main ENDP END main
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Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.
Every assembler may have it's own assembly language designed for a specific computers or an operating system.
Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.
Assembly language usually consists of three sections,
Data section
To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section
To declare variables
text section
_start specifies the starting of this section where the actually code is written.
There are various define directives to allocate space for variables for both initialized and uninitialized data.
variable-name define-directive initial-value
| Define Directive | Description | Allocated Space |
|---|---|---|
| DB | Define Byte | 1 byte |
| DW | Define Word | 2 bytes |
| DD | Define Doubleword | 4 bytes |
| DQ | Define Quadword | 8 bytes |
| DT | Define Ten Bytes | 10 bytes |
| Define Directive | Description |
|---|---|
| RESB | Reserve a Byte |
| RESW | Reserve a Word |
| RESD | Reserve a Doubleword |
| RESQ | Reserve a Quadword |
| REST | Reserve a Ten Bytes |
Constants can be defined using
CONSTANT_NAME EQU regular-exp or value
%assign constant_name value
%define constant_name value
Loops are used to iterate a set of statements for a specific number of times.
mov ECX,n
L1:
;<loop body>
loop L1
where n specifies the no of times loops should iterate.
Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
procedure_name:
;procedure body
ret