Programming Forums - how to print floating point numbers

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how to print floating point numbers

Programs computes the roots of Quadratic equations: Ax^2+Bx+C=0,it doesnot print the fractional part of roots.

How to print fractional part ?

finit
fstcw controlWd
or controlWd,0000110000000000b
fldcw controlWd

output prompt1
output prompt2
input string,40
atod string
mov A,eax

output prompt3
input string,40
atod string
mov B,eax

output prompt4
input string,40
atod string
mov C1,eax

fild C1 ;value of C in ST0
fild A ;value of A in ST1
fmul ;A*C and in ST0
fild no ;4 in ST0
fmul ;4*A*C and in ST0
fild B ;B in ST0
fild B ;B in ST1
fmul ;B*B in ST0
fsubr ;B*B - ( 4*A*C) and in ST0
fsqrt ;Determinant( D ) = SQRT( B^2-4AC) and in ST0
fist no3 ;store D
mov eax,no3 ;store D in eax
fild B ;B in ST0
fchs ;-B in ST0
fsubr ;-B-D in ST0
fild no4 ;2 in ST0
fild A ;A in ST0
fmul ;2*A
fdiv ;-B-D/2*A
fist no5 ;store first root
mov ebx,no5 ;store first root in ebx
fild no3 ;D in ST0
fild B
fchs
fadd
fild no4
fild A
fmul
fdiv
fst no10
fist no7
mov ecx,no7

dtoa no6,ebx
output print2

dtoa no9,ecx
output print3

EAX, you have 14 posts. One would presume that you have read the forum's rules and "How to Post..." threads just as a courtesy to your fellow members. To fit in, donchano. Read them again, looking out for the part that mentions using 'code tags.'

How to print floting point numbers ?

Thanks, DaWei for pointing it out .

This Program computes the roots of Quadratic equations: Ax^2+Bx+C=0,it doesnot print the fractional part of roots.

How to print fractional part ?

finit

fstcw controlWd

or controlWd,0000110000000000b

fldcw controlWd





output prompt1

output prompt2

input string,40

atod string

mov A,eax





output prompt3

input string,40

atod string

mov B,eax





output prompt4

input string,40

atod string

mov C1,eax





fild C1                              ;value of C in ST0

fild A                               ;value of A in ST1

fmul                                 ;A*C and in ST0

fild no                              ;4 in ST0

fmul                                 ;4*A*C and in ST0

fild B                               ;B in ST0

fild B                               ;B in ST1

fmul                                 ;B*B in ST0

fsubr                                ;B*B - ( 4*A*C) and in ST0

fsqrt                                ;Determinant( D ) = SQRT( B^2-4AC) and in ST0

fist no3                             ;store D 

mov eax,no3                          ;store D in eax

fild B                               ;B in ST0

fchs                                ;-B in ST0

fsubr                               ;-B-D in ST0

fild no4                            ;2 in ST0

fild A                               ;A in ST0

fmul                                ;2*A

fdiv                                 ;-B-D/2*A

fist no5                            ;store first root 

mov ebx,no5                         ;store first root in ebx

fild no3                            ;D in ST0

fild B

fchs

fadd

fild no4

fild A

fmul

fdiv

fst no10 

fist no7

mov ecx,no7







dtoa no6,ebx

output print2





dtoa no9,ecx

output print3

It's probably just my age and inactivity showing, but your code looks strange to me. What assembler are you using, and are there macros floating about that I can't see?

I am using ML assembler from MASM 6.1 , i am not using any macros.
I am just using FPU 8 registers and only Floating point instructions to accomplish the task.

Okay, I'm going to unashamedly admit that I never saw a MASM with dtoa and output instructions. I'm going to leave you to the tender mercies of someone else. I suspect the conversion and output, though.