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  1. ; ------------------------------------------------------------------
  2. ; userinput.asm
  3. ;
  4. ; This is a Win32 console program that reads user input from the keyboard
  5. ; and displays it on the screen then exits.
  6. ;
  7. ; To assemble to .obj: nasm -f win32 userinput.asm
  8. ; To compile to .exe:  gcc userinput.obj -o userinput.exe
  9. ; ------------------------------------------------------------------
  10.  
  11. global _main ; _start
  12.  
  13. ; The data section is used for declaring initialized data or constants. 
  14. ; This data does not change at runtime. 
  15. ; You can declare various constant values, file names or buffer size etc. in this section.
  16. section .data
  17. 	inputMsg		db 'Please enter a number: ', 	; Ask the user to enter a number.
  18. 	inputMsglen 	equ $-inputMsg					; length of the input message.
  19.  
  20. 	outputMsg		db 'The entered number is: '
  21. 	outputMsgLenm	equ $-outputMsg					
  22.  
  23.  
  24. ; The bss section is used for declaring variables.
  25. section .bss
  26. 	num	resb 5
  27.  
  28. ; The text section is used for keeping the actual code. 
  29. ; This section must begin with the declarationglobal main, 
  30. ; which tells the kernel where the program execution begins.
  31. section .text
  32.  
  33. ; _start:
  34. _main:
  35. 	; User prompt "Please enter a number: "
  36. 	mov		edx, inputMsglen	; message length
  37. 	mov		ecx, inputMsg		; message to write
  38. 	mov 	ebx, 01h			; file descriptor (stdout)
  39. 	mov 	eax, 04h			; system call number (sys_write)
  40. 	int 	0x80				; call kernel
  41.  
  42. 	; Read & store user input.
  43. 	mov		edx, 5				; 5 bytes length (numeric, 1 for sign) of that information
  44. 	mov		ecx, num			; variable to store user input
  45. 	mov 	ebx, 02h			; file descriptor (stdin)
  46. 	mov 	eax, 03h			; system call number (sys_read)
  47. 	int 	0x80				; call kernel
  48.  
  49. 	; Output the message 'The entered number is: '
  50. 	mov		edx, outputMsgLenm	; message length
  51. 	mov		ecx, outputMsg		; message to write
  52. 	mov 	ebx, 01h			; file descriptor (stdout)
  53. 	mov 	eax, 04h			; system call number (sys_write)
  54. 	int 	0x80				; call kernel
  55.  
  56. 	; Output the number entered
  57. 	mov		edx, 5				; 
  58. 	mov		ecx, num			;
  59. 	mov		ebx, 01h			;
  60. 	mov		eax, 04h			;
  61. 	int		80h					; 
  62.  
  63. 	jmp		exit
  64.  
  65. exit:
  66. 	mov		eax, 01h		; exit()
  67. 	mov		ebx, 0			; errno
  68. 	int		80h
  69.  
Success #stdin #stdout 0s 5296KB
comments (?)
stdin
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Standard input is empty
stdout
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Please enter a number: The entered number is:
https://ideone.com/6ZiOdy
language:
Assembler 32bit (nasm 2.14)
created:
11 days ago
visibility:
public

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