Question

-data array byte 1,2,3,4,5,6,7,8

mode
mov ESI, OFFSET array
mov AL, 5
add [ESI], AL
add [ESI], 5
​From the code block above, any compiling error? If there is one, explain why the error happened and how to correct it?

Answer 1

The code block provided, which is written in assembly language, should compile without errors as it contains correct use of 'mov' and 'add' instructions and proper syntax for adding values to array elements.

Step-by-step explanation:

From the code block provided, there appears to be no compiling error. The code is written in assembly language and includes the instruction to move the offset of the array into the ESI register, move a literal value into AL, and then add the value in AL to the first element of the array. It then adds a literal value directly to the same element.

The code correctly uses the mov and add instructions; no syntax errors are evident given the provided code. However, without full context, there could be other issues not immediately visible, such as improper setup or surrounding code that could cause a runtime error or unexpected behavior.

there is a compiling error in the given code. The error occurs in the line 'add [ESI], AL'. The add instruction requires a register or memory operand on the left side, and in this case, the '[ESI]' is not a valid memory operand. To correct the error, you can replace 'add [ESI], AL' with 'add BYTE PTR [ESI], AL'.