ExitProcess PROTO,dwExitCode:DWORD .data prompt db "Enter the length of one edge (0 to exit): ",0 areaMsg db "Surface area of the icosahedron: ",0 volumeMsg db "Volume of the icosahedron: ",0 fmt db "%.2f",0 edge REAL8 ? area REAL8 ? volume REAL8 ? phi REAL8 1.61803398875 five REAL8 5.0 twelve REAL8 12.0 .code main PROC ; seed random number generator call srand L1: ; prompt user to enter edge length mov edx, OFFSET prompt call WriteString ; read input from user call ReadDouble fstp edge ; check if input is 0 fldz fcomp edge je L2 ; check if input is negative fldz fcomp edge jng L1 ; calculate surface area and volume fld edge fmul five fmul phi fmul edge fstp area fld edge fmul edge fmul edge fmul twelv fld phi fadd fmul edge fmul twelv fdiv fstp volume ; display results mov edx, OFFSET areaMsg call WriteString fld area push OFFSET fmt call WriteDouble call Crlf mov edx, OFFSET volumeMsg call WriteString fld volume push OFFSET fmt call WriteDouble call Crlf jmp L1 L2: ; exit program invoke ExitProcess, 0 main ENDP ; Calculates a random integer between 0 and 100, inclusive. random PROC push ebp mov ebp, esp push eax push ebx push ecx push edx ; calculate random number mov eax, 101 call srand call rand mov ebx, eax ; restore registers and return result pop edx pop ecx pop ebx pop eax pop ebp ret random ENDP END main
Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.
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