I am writing a program in Turbo Assembler which gets a number from console, calculate another number based on it, and prints result onto console.
I have done conversion from string to floating-point number and back through subprograms (I do not think it really matters, just in case). However, I have problem. I have to work with LONG DOUBLE (TWORD, DT) numbers, and I just can not do it! I can do it with DOUBLE (QWORD, DQ) and FLOAT (DWORD, DD) numbers, but no way with TWORD. Okay, just the code (I pass argument through stack, just in case):
locals __
...
string_to_float proc near
arg __ARGS:word:4 = __ARGSIZE
__ARG struc
__BP dw ?
__IP dw ?
__STRING dw ? ; string address
__DT dw ? ; LONG DOUBLE number address
__ARG ends
...
mov BX, __DT[BP]
fstp tword ptr [BX]
...
When assembling, TASM says:
Undefined symbol: TWORD
Argument needs type override
It points to the very last line of the code I have given here.
There is no problem if I do it, for example, with DOUBLE number, like this:
locals __
...
string_to_float proc near
arg __ARGS:word:4 = __ARGSIZE
__ARG struc
__BP dw ?
__IP dw ?
__STRING dw ?
__DQ dw ? ; DOUBLE number address
__ARG ends
...
mov BX, __DQ[BP]
fstp qword ptr [BX]
...
What can be done here? I have searched for different names for TWORD, but I have only found, well, TWORD and DT, which I have already known.
FSTP TBYTE PTR [BX]
In the end checking TD disassembly did help most, even checking the quick reference guide and fstp instruction examples was not enough, the example is wrong there and I overlooked the tbyte ptr defined at page 12 in "Turbo Assembler 5.0 Quick Reference Guide":
TBYTE PTR expression | Ideal, MASM
Forces address expression to be 10-byte size