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  1. section .data
  2.     prompt db "Enter a number: ", 0
  3.     resultMsg db "The sum is: ", 0
  4.  
  5. section .bss
  6.     num1 resb 1
  7.     num2 resb 1
  8.     result resb 1
  9.  
  10. section .text
  11.     global _start
  12.  
  13. _start:
  14.     ; Print "Enter a number:"
  15.     mov eax, 4        ; syscall number for sys_write
  16.     mov ebx, 1        ; file descriptor for stdout
  17.     mov ecx, prompt   ; address of the prompt string
  18.     mov edx, 16       ; length of the string
  19.     int 0x80          ; invoke system call
  20.  
  21.     ; Read first number from user
  22.     mov eax, 3        ; syscall number for sys_read
  23.     mov ebx, 0        ; file descriptor for stdin
  24.     mov ecx, num1     ; address to store input
  25.     mov edx, 1        ; read 1 byte
  26.     int 0x80          ; invoke system call
  27.  
  28.     ; Convert the first ASCII input to integer
  29.     mov al, [num1]    ; move the character from input to AL
  30.     sub al, '0'       ; convert ASCII to integer
  31.     mov bl, al        ; store the first number in bl
  32.  
  33.     ; Print "Enter a number:"
  34.     mov eax, 4
  35.     mov ebx, 1
  36.     mov ecx, prompt
  37.     mov edx, 16
  38.     int 0x80
  39.  
  40.     ; Read second number from user
  41.     mov eax, 3
  42.     mov ebx, 0
  43.     mov ecx, num2
  44.     mov edx, 1
  45.     int 0x80
  46.  
  47.     ; Convert the second ASCII input to integer
  48.     mov al, [num2]
  49.     sub al, '0'
  50.     mov cl, al        ; store the second number in cl
  51.  
  52.     ; Add the numbers
  53.     add bl, cl        ; bl = bl + cl
  54.  
  55.     ; Print "The sum is: "
  56.     mov eax, 4
  57.     mov ebx, 1
  58.     mov ecx, resultMsg
  59.     mov edx, 15
  60.     int 0x80
  61.  
  62.     ; Convert the result to ASCII and print it
  63.     add bl, '0'       ; convert back to ASCII
  64.     mov eax, 4        ; syscall number for sys_write
  65.     mov ebx, 1        ; file descriptor for stdout
  66.     mov ecx, result   ; address of result variable
  67.     mov [result], bl  ; store the result in memory
  68.     mov edx, 1        ; print 1 byte
  69.     int 0x80          ; invoke system call
  70.  
  71.     ; Exit the program
  72.     mov eax, 1        ; syscall number for sys_exit
  73.     xor ebx, ebx      ; exit code 0
  74.     int 0x80
  75.  
Success #stdin #stdout 0s 5280KB
comments (?)
stdin
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Standard input is empty
stdout
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Enter a number: Enter a number: The sum is: 
https://ideone.com/lrT82x
language:
Assembler 32bit (nasm 2.14)
created:
2 days ago
visibility:
public

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