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assemblyasciimasmmasm32

Print a DWORD's value as an ASCII character

I have a very simple program where I've stored a number in a dw variable called asciiCode. I want to then use the print macro declared in masm32rt.inc to print the ASCII character represented by this value, A, but attempting to do this crashes the program:

.386
option casemap:none

include \masm32\include\masm32rt.inc

.data
    asciiCode dw 65

.code 
start:
    print asciiCode
    exit
end start

The program still crashes when asciiCode is declared as a db or dd.

Is there another function that I must use first to convert this dw into a printable ASCII character?

Solution

  • The simplest way might be to use the printf macro:

    ; prints 65. If you want the character A instead, use the format specifier %c
printf("%d", asciiCode)

    You should probably declare asciiCode using dd in this case - dw gives you a word, not a dword.