masm assembly how to divide and multiply numbers using the fpu

Question

I am new to masm and assembly and need some help. I have spent probably 6 hours on this already. I have 3 text boxes and 2 buttons. I want one of the buttons to multiply the numbers in the text boxes and show the result in the third text box, and the other button to divide the numbers in the 2 text boxes and show the result in the third text box. the numbers are almost always going to have decimals in them.

I have tried a lot of things but this is the code I think is the closest.

divide

invoke GetDlgItemInt,hWin,textbox1,NULL,TRUE
mov esi,eax
invoke GetDlgItemInt,hWin,textbox2,NULL,TRUE
mov edi,eax 

mov math1,esi

fild math1

mov math2,edi

fidiv math2

fstsw math3

invoke SetDlgItemInt,hWin,textbox3,math3,TRUE

multiply

invoke GetDlgItemInt,hWin,textbox1,NULL,TRUE
mov esi,eax
invoke GetDlgItemInt,hWin,textbox2,NULL,TRUE
mov edi,eax 

mov math1,esi

fild math1

mov math2,edi

fimul math2

fstsw math3

invoke SetDlgItemInt,hWin,textbox3,math3,TRUE

.data

math1   dd   ?
math2   dd   ?
math3   dw   ?

the code above gives the wrong numbers in the text box. can someone please show me what I need to do.

thank you

Update

this code works

LOCAL var1 :QWORD
LOCAL var2 :QWORD
LOCAL var3 :QWORD
LOCAL str1[19]:BYTE
LOCAL str2[19]:BYTE
LOCAL str3[19]:BYTE

invoke GetDlgItemText,hWin,textbox1,addr str1,9
invoke StrToFloat,addr str1,addr var1

invoke GetDlgItemText,hWin,textbox2,addr str2,9
invoke StrToFloat,addr str2,addr var2

finit
fld var1
fld var2
fdiv
fstp var3

invoke FloatToStr,var3,addr str3
invoke SetDlgItemText,hWin,textbox3,addr str3

Answer 1

FSTSW is storing the status word, not the result. What you need is FISTP (for integers) or FSTP (for floating point).