section .data
hello: db 'Assignment6!',10 ; 'Hello world!' plus a linefeed character
helloLen: equ $-hello ; Length of the 'Hello world!' string
section .text
global _start
_start:
// Assembly code
.LC0:
.string "Ten random numbers in [1,100]"
.LC1:
.string "The random numbers are:"
.LC2:
.string "%d\t"
.LC3:
.string "%d\n"
main:
push rbp
mov rbp, rsp
sub rsp, 64
mov DWORD PTR [rbp-8], 0
mov edi, OFFSET FLAT:.LC0
call puts
mov DWORD PTR [rbp-4], 0
jmp .L2
.L3:
call rand
mov ecx, eax
mov edx, 1374389535
mov eax, ecx
imul edx
sar edx, 5
mov eax, ecx
sar eax, 31
sub edx, eax
mov eax, edx
imul eax, eax, 100
sub ecx, eax
mov eax, ecx
add eax, 1
mov DWORD PTR [rbp-12], eax
mov eax, DWORD PTR [rbp-4]
cdqe
mov edx, DWORD PTR [rbp-12]
mov DWORD PTR [rbp-64+rax*4], edx
mov eax, DWORD PTR [rbp-4]
cdqe
mov eax, DWORD PTR [rbp-64+rax*4]
add DWORD PTR [rbp-8], eax
add DWORD PTR [rbp-4], 1
.L2:
cmp DWORD PTR [rbp-4], 9
jle .L3
mov edi, OFFSET FLAT:.LC1
mov eax, 0
call printf
mov DWORD PTR [rbp-4], 0
jmp .L4
.L5:
mov eax, DWORD PTR [rbp-4]
cdqe
mov eax, DWORD PTR [rbp-64+rax*4]
mov esi, eax
mov edi, OFFSET FLAT:.LC2
mov eax, 0
call printf
add DWORD PTR [rbp-4], 1
.L4:
cmp DWORD PTR [rbp-4], 9
jle .L5
mov eax, DWORD PTR [rbp-8]
mov esi, eax
mov edi, OFFSET FLAT:.LC3
mov eax, 0
call printf
mov eax, 0
leave
ret
// c code
#include <stdio.h>
#include <stdlib.h>
int main() {
int c, n,sum=0;
int arr[10];
printf("Ten random numbers in [1,100]\n");
for (c = 0; c < 10; c++) {
n = rand() % 100 + 1;
arr[c]=n;
sum+=arr[c];
}
printf("The random numbers are:");
for(c=0;c<10;c++) printf("%d\t",arr[c]);
printf("%d\n",sum);
return 0; 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