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  1. %macro scall 4                              ;macro declaration with 4 parameters
  2. mov eax,%1                                  ;1st parameter has been moved to eax
  3. mov ebx,%2                                  ;2nd parameter has been moved to ebx
  4. mov ecx,%3                                  ;3rd parameter has been moved to ecx
  5. mov edx,%4                                  ;4th parameter has been moved to edx
  6. int 80h                                     ;Call the Kernal
  7. %endmacro                                   ;end of macro
  8.  
  9. section .data                               ;.data begins here
  10.         m1 db 10d,13d,"Enter a string: "    ;m1 variable initialised with string
  11.         l1 equ $-m1                         ;l1 stores length of string m1
  12.         m2 db 10d,13d,"Entered String: "    ;m2 variable initialised with string
  13.         l2 equ $-m2                         ;l2 stores length of string m2
  14.         m3 db 10d,13d,"Length: "            ;m3 variable initialised with string
  15.         l3 equ $-m3                         ;l3 stores length of string m3
  16.  
  17. section .bss                                ;.bss begins here
  18.         buffer resb 50                      ;buffer array of size 50
  19.         size equ $-buffer                   ;size variable to have input
  20.         count resd 1                        ;to store size of buffer
  21.         dispnum resb 8                      ;to display 8 digit length
  22.  
  23. section .text                               ;.text begins here
  24.         global _start                       ;moving to _start label
  25.         _start:                             ;_start label
  26.                 scall 4,1,m1,l1             ;macro call to display m1
  27.                 scall 3,0,buffer,size       ;macro call to input buffer
  28.                 mov [count],eax             ;length of buffer gets stored in count
  29.                 scall 4,1,m2,l2             ;macro call to display m2
  30.                 scall 4,1,buffer,[count]    ;macro call to display buffer
  31.                 scall 4,1,m3,l3             ;macro call to display m3
  32.  
  33.                 mov esi,dispnum+7           ;esi points to 8th location of dispnum
  34.                 mov eax,[count]             ;eax now stores value of count
  35.                 mov ecx,8                   ;ecx gets initiaised with 8
  36.                 dec eax                     ;decrement the value of eax
  37.         UP1:                                ;UP1 label
  38.                 mov edx,0                   ;edx gets initiaised with 0
  39.                 mov ebx,10                  ;ebx gets initialised with 10
  40.                 div ebx                     ;divide the contents of eax by ebx
  41.                 add dl,30h                  ;add 30 to the remainder
  42.                 mov [esi],dl                ;dl content gets copied at esi 
  43.                 dec esi                     ;decrement esi
  44.                 loop UP1                    ;jump to UP1 till ecx becomes 0
  45.  
  46.                 scall 4,1,dispnum,8         ;macro call to display dispnum array
  47.  
  48.                 mov eax,1                   ;sys_exit function
  49.                 mov ebx,0                   ;Sucessful Termination
  50.                 int 80h                     ;Call the Kernel
Success #stdin #stdout 0s 5280KB
comments (?)
stdin
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Sahil
stdout
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Enter a string: 

Entered String: Sahil

Length: 00000004
https://ideone.com/z2aiLz
language:
Assembler 32bit (nasm 2.14)
created:
22 hours ago
visibility:
public

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