ExitProcess PROTO, dwExitCode:DWORD Include Irvine32.inc CalcGrade PROC ; input: edx (score) ; output: al (grade) cmp edx, 90 ja grade_a cmp edx, 80 ja grade_b cmp edx, 70 ja grade_c cmp edx, 60 ja grade_d mov al, 'F' jmp end_calcgrade grade_a: mov al, 'A' jmp end_calcgrade grade_b: mov al, 'B' jmp end_calcgrade grade_c: mov al, 'C' jmp end_calcgrade grade_d: mov al, 'D' end_calcgrade: ret CalcGrade ENDP .DATA edges DB ? surfaceArea REAL4 ? volume REAL4 ? .CODE main PROC ; seed random number generator call Randomize ; generate and display 10 random integers and their letter grade mov ecx, 10 L1: call RandomRange, 0, 100 call WriteInt call Crlf push eax call CalcGrade call WriteChar call Crlf loop L1 ; calculate the area and volume of an icosahedron L2: call Clrscr call WriteString, "Enter the length of one of the edges (0 to exit): " call ReadInt cmp eax, 0 je end_program cmp eax, 0 jle L2 mov edges, al fld edges fmul 5.0 fsqrt fld edges fmul 2.5 fmul st(0), st(1) fmul 3.0 fsqrt fmul st(0), st(1) fmul 5.0 fdiv 12.0 fstp surfaceArea fld edges fmul edges, edges fmul edges, 5.0 fmul 3.0 fsqrt fmul 5.0 fdiv 12.0 fmul 3.0 + fsqrt(5.0) fmul edges, edges fmul 0.5 fdiv 2.0 fstp volume call Clrscr call WriteString, "The surface area of the icosahedron is: " call WriteFloat, surfaceArea call Crlf call WriteString, "The volume of the icosahedron is: " call WriteFloat, volume call Crlf jmp L2 end_program: call ExitProcess, 0 main 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