error A2070: invalid instruction operands while using nested while loop in assembly language

Question

I am trying nested while loop in assembly using masm. I am getting the \"error A2070: invalid instruction operands\" at line 15 i.e at the endw directive of internal while loop

Answer 1

The error is here:

.while j<i

You cannot compare two memory contents directly. It is possible to compare a memory content with a register, e.g.:

mov dl, i
.while j<dl

BTW: Don't trust an "alien" function (Irvine's WriteDec and Crlf). When a register unintentionally changes its contents, this can due to such a function.