Long multiplication: Difference between revisions
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700 IF E THEN V = VAL ( MID$ (D$,E,1)) + C:C = V > 9:V = V - 10 * C:E$ = STR$ (V) + E$:E = E - 1: GOTO 700 |
700 IF E THEN V = VAL ( MID$ (D$,E,1)) + C:C = V > 9:V = V - 10 * C:E$ = STR$ (V) + E$:E = E - 1: GOTO 700 |
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720 RETURN</lang> |
720 RETURN</lang> |
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=={{header|Batch File}}== |
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Based on the JavaScript iterative code. |
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<lang dos>::Long Multiplication Task from Rosetta Code |
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::Batch File Implementation |
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@echo off |
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call :longmul 18446744073709551616 18446744073709551616 answer |
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echo(%answer% |
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exit /b 0 |
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rem The Hellish Procedure |
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rem Syntax: call :longmul <n1> <n2> <variable to store product> |
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:longmul |
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setlocal enabledelayedexpansion |
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rem Define variables |
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set "num1=%1" |
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set "num2=%2" |
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set "limit1=-1" |
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set "limit2=-1" |
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set "length=0" |
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set "prod=" |
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rem Reverse the digits of each factor |
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for %%A in (1,2) do ( |
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for /l %%B in (0,1,9) do set "num%%A=!num%%A:%%B=%%B !" |
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for %%C in (!num%%A!) do ( set /a limit%%A+=1 & set "rev%%A=%%C!rev%%A!" ) |
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) |
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rem Do the multiplication |
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for /l %%A in (0,1,%limit1%) do ( |
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for /l %%B in (0,1,%limit2%) do ( |
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set /a iter=%%A+%%B |
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set /a iternext=iter+1 |
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set /a iternext2=iter+2 |
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set /a prev=digit!iter! |
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set /a digit!iter!=!rev1:~%%A,1!*!rev2:~%%B,1! |
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rem The next line updates the length of "digits" |
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if !iternext! gtr !length! set length=!iternext! |
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if !iter! lss !length! set /a digit!iter!+=prev |
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set /a currdigit=digit!iter! |
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if !currDigit! gtr 9 ( |
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set /a prev=digit!iternext! |
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set /a digit!iternext!=currdigit/10 |
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set /a digit!iter!=currdigit%%10 |
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rem The next line updates the length of "digits" |
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if !iternext2! gtr !length! set length=!iternext2! |
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if !iternext! lss !length! set /a digit!iternext!+=prev |
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) |
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) |
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) |
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rem Finalize product reversing the digits |
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for /l %%F in (0,1,%length%) do set "prod=!digit%%F!!prod!" |
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endlocal & set "%3=%prod%" |
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goto :eof</lang> |
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{{Out}} |
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<pre>340282366920938463463374607431768211456</pre> |
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=={{Header|BBC BASIC}}== |
=={{Header|BBC BASIC}}== |
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