Yup, did it in ASM as a practice application. It's good to learn in my opinion.
I don't know where the actual post is.. but.. The exercise was to display every Friday the 13th from year 1900 to year 2000.
I used the same logic as i used in the Challenge.
Bla bla bla, here goes the code. By the way, it might be a little (or a lot) messy but I'm still getting used to this shit.
Code:
.386
.model flat, stdcall
option casemap:none
include E:\masm32\include\windows.inc
include E:\masm32\include\kernel32.inc
include E:\masm32\include\masm32.inc
include E:\masm32\include\user32.inc
includelib E:\masm32\lib\user32.lib
includelib E:\masm32\lib\kernel32.lib
includelib E:\masm32\lib\masm32.lib
GetMonthMax PROTO month:DWORD,year:DWORD
.data
hStd dd ?
bytesOut dd ?
monthsTOne dd 1,3,5,7,8,10,12,0
monthsTZero dd 4,6,9,11,0
currentDay dd ?
currentMonth dd ?
currentYear dd ?
total dd 0
number dd ?
.code
GetMonthMax PROC month:DWORD,year:DWORD
MOV EDX, month
;Check if it is 31 days
MOV EBX, offset monthsTOne
TOne:
CMP DWORD PTR [EBX], EDX
JE endTOne
ADD EBX, 4
CMP DWORD PTR [EBX], 0
JE continueTOne
JMP TOne
endTOne:
MOV EAX, 31
JMP endProc
continueTOne:
;Check if it is 30 days
MOV EBX, offset monthsTZero
TZero:
CMP DWORD PTR [EBX], EDX
JE endTZero
ADD EBX, 4
CMP DWORD PTR [EBX], 0
JE continueTZero
JMP TZero
endTZero:
MOV EAX, 30
JMP endProc
continueTZero:
;Check if it is 28/29 days
MOV EAX, year
MOV ECX, 4
DIV ECX
CMP EDX, 0 ;Check if Year % 4 Equals 0
JNE endTFeb28
MOV EAX, year
MOV ECX, 100
DIV ECX
CMP EDX, 0 ;Check if Year % 100 Equals 0
JNE endTFeb
MOV EAX, year
MOV ECX, 400
DIV ECX
CMP EDX, 0 ;Check if Year % 400 Equals 0
JE endTFeb28
endTFeb:
MOV EAX, 29
JMP endProc
endTFeb28:
MOV EAX, 28
endProc:
ret
GetMonthMax ENDP
START:
;push 1908
;push 2
;call GetMonthMax
;MOV monthDays, EAX
MOV EDX, 5 ;Starting day of 1900 year
MOV ECX, 1900 ;Years - Starts at 1900, Ends at 2000
yearsLoop:
MOV EBX, 1 ;Months - Starts at 1, Ends at 12
monthsLoop:
infLoop:
CMP EDX, 13
JNE continueInfLoop
push EAX ;Uses EAX as a temporary store, saving the current value of it in the stack
MOV EAX, total
INC EAX
MOV total, EAX
POP EAX ;Sets EAX value back from the stack
continueInfLoop:
ADD EDX, 7 ;Adds 7 days to the current day
MOV currentDay, EDX ;saves the current day
MOV currentMonth, ECX ;saves the current month
MOV currentYear, EBX ;saves the current year
push ECX
push EBX
call GetMonthMax
MOV ECX, currentMonth
MOV EBX, currentYear
MOV EDX, currentDay
CMP EDX, EAX
JL infLoop
SUB EDX, EAX
endInfLoop:
INC EBX
CMP EBX, 13
JNE monthsLoop
endMonthsLoop:
INC ECX
CMP ECX, 2001
JNE yearsLoop
endYearsLoop:
;OUTPUT
push -11
call GetStdHandle
MOV hStd, EAX
MOV ECX, 10
MOV EAX, total
MOV EBX, 0
;Convert from Decimal to ASCII
convertNum:
MOV EDX, 0
DIV ECX
push EDX
INC EBX
CMP EAX, 0
JNE convertNum
convertEnd:
;Stack stores the number now in the correct order
;EBX will have the number lengh
MOV ECX, EBX
MOV EDX, offset number
saveNumber:
POP EAX ;recover one number from the stack to EAX and then save it
ADD EAX, 48 ;To convert it into the correct ASCII code
MOV BYTE PTR [EDX], AL ;Save the number to the byte pointed by EDX
INC EDX ;Next byte to save the next number
DEC EBX ;Counter--
CMP EBX, 0
JNE saveNumber
saveEnd:
;Write to Console
push 0
push offset bytesOut
push ECX
push offset number
push hStd
call WriteConsole
;Exit Process
push 0
call ExitProcess
END START