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Aug 28th, 2006
Views: 4,644
cscgal
This is a program I wrote for my x86 assembly class which computes the sum of n numbers. It uses Irvine32.inc which came with the textbook.
Last edited : Aug 28th, 2006.
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asm Syntax
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  1. title Number Addition										(add.asm)
  2.  
  3. ; Dani Horowitz
  4. ; CSC111 x86 Assembly Programming
  5.  
  6. ; This program adds integers a user inputs
  7.  
  8. INCLUDE Irvine32.inc
  9.  
  10. ;--------------------------------------------------
  11. .stack			; begin stack segment
  12.  
  13. ;--------------------------------------------------
  14. .data			; begin data segment
  15.  
  16. 	sum			dword	0
  17. 	counter		dword	0
  18. 	prompt		byte	"Enter a value: (0 to stop) ", 0
  19. 	result		byte	"The sum of ", 0
  20. 	count		byte	" numbers is ", 0
  21.  
  22. ;--------------------------------------------------
  23. .code			; begin code segment
  24.  
  25. ;--------------------------------------------------
  26.  
  27.  
  28. ;--------------------------------------------------
  29. prompt_user PROC
  30. ;
  31. ; Take a break! Pauses screen
  32. ;--------------------------------------------------
  33.  
  34. 	mov		edx, OFFSET prompt		; prompt user to enter values
  35. 	call	WriteString
  36. 	call	Crlf
  37.  
  38. GetValue:
  39.  
  40. 	call	ReadInt					; read integer from keyboard
  41. 	jo		Overflow				; if ReadInt set overflow flag, jump to Overflow
  42.  
  43. 	add		sum, eax				; add entered value to accumulator sum
  44. 	jo		Overflow				; if addition set overflow flag, jump to Overflow
  45.  
  46. 	cmp		eax, 0					; did user enter 0?
  47. 	je		Done					;   if yes, goto Done
  48.  
  49. 	inc		counter					; increment counter
  50. 	jmp		GetValue				; loop
  51.  
  52. Overflow:
  53.  
  54. 	mov		eax, 0
  55. 	mov		sum, 0
  56.  
  57. Done:	
  58.  
  59. 	ret
  60. ;--------------------------------------------------
  61. prompt_user ENDP
  62. ;--------------------------------------------------
  63.  
  64. ;--------------------------------------------------
  65. print_sum PROC
  66. ;
  67. ; Take a break! Pauses screen
  68. ;--------------------------------------------------
  69.  
  70. 	mov		edx, OFFSET result	; prints "The sum of "
  71. 	call	WriteString
  72.  
  73. 	mov		eax, counter		; prints count of #s entered
  74. 	call	WriteDec
  75.  
  76. 	mov		edx, OFFSET count	; prints " numbers is "
  77. 	call	WriteString	
  78.  
  79. 	mov		eax, sum			; prints sum
  80. 	call	WriteDec
  81. 	call	Crlf
  82.  
  83. 	ret
  84. ;--------------------------------------------------
  85. print_sum ENDP
  86. ;--------------------------------------------------
  87.  
  88. ;--------------------------------------------------
  89. main proc
  90. ;--------------------------------------------------
  91. 	call	Clrscr			; clear screen
  92. 	call	prompt_user		; get integers
  93. 	call	print_sum		; print their sum
  94. 	exit
  95.  
  96. main  endp
  97. end main
  98. ;--------------------------------------------------
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