Narc narcissistic number
It is suggested to use three nested loops...
It is suggested to use three nested loops...
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中国DOS联盟论坛 » DOS批处理 & 脚本技术（批处理室） » Set out a question, all picked from C language questions by me
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Floor 16
Posted 2008-04-11 21:10 · 中国 陕西 西安 电信
Floor 17
Posted 2008-04-11 21:42 · 中国 湖南 株洲 电信
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Because cmd is limited to 10-digit numbers, using this method can only accurately calculate the height of the ball bouncing up on the 10th landing, and the distance traveled in 10 passes cannot be accurately calculated (depressed):
[ Last edited by zw19750516 on 2008-4-11 at 10:05 PM ]
@echo off
set /a n=100*10000000&set m=0
:begin
if %m% gtr 0 set str=%str%+2*%n%
if %m% gtr 0 set /a str=%str%/10000000
set /a n/=2&set /a m+=1
if %m% lss 10 goto begin
set /a str=%str%+100/2
echo The total distance after the 10th landing of the ball is %str% meters
:lp
if "%n:~,-6%"=="" set n=0%n%
if "%n:~,-6%"=="" goto lp
echo The 10th bounce is 0.%n% meters
pause>nul[ Last edited by zw19750516 on 2008-4-11 at 10:05 PM ]
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Floor 18
Posted 2008-04-11 22:26 · 中国 湖南 株洲 电信
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```@echo off&setlocal enabledelayedexpansion
set n=10
for %%i in (2,2,2,2) do set /a n+=%%i&cls&echo The fifth person is!n! years old
pause>nul
```
set n=10
for %%i in (2,2,2,2) do set /a n+=%%i&cls&echo The fifth person is!n! years old
pause>nul
```
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Floor 19
Posted 2008-04-11 22:34 · 中国 江苏 常州 溧阳市 电信
The Narcissistic number algorithm is indeed better with three nested loops. The following one was forgotten who the moderator wrote, but I remember it was written by moderator namejm:
@echo off
echo.
echo Three-digit narcissistic numbers are:
echo.
setlocal enabledelayedexpansion
for /l %%i in (1,1,9) do (
for /l %%j in (0,1,9) do (
for /l %%k in (0,1,9) do (
set a=%%i
set b=%%j
set c=%%k
set num1=!a!!b!!c!
set /a num2=!a!*!a!*!a!+!b!*!b!*!b!+!c!*!c!*!c!
if !num1! equ !num2! echo !num1!
)
)
)
pause
goto :eof
简单!简单!再简单!
Floor 20
Posted 2008-04-11 22:35 · 中国 湖南 株洲 电信
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@echo off
set /a str=6*7*7*7*7*7*4
echo There can be %str% odd numbers formed
pause>nul
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Floor 21
Posted 2008-04-11 22:41 · 中国 湖南 株洲 电信
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Originally posted by terse at 2008-4-11 22:34:
The narcissistic number algorithm is indeed better with three nested loops. The following one I forgot who the moderator wrote, I remember it was written by moderator namejm:
@echo off
echo.
echo Three-digit narcissistic numbers are:
echo.
setlocal ...
I don't think so. My code can implement it very well (I initially missed a *), why write such complicated code.
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Floor 22
Posted 2008-04-11 23:47 · 中国 陕西 西安 电信
In terms of efficiency, a 3-layer loop is better than looping from 111 to 999.
For program code, efficiency is the top priority.
For program code, efficiency is the top priority.
Floor 23
Posted 2008-04-11 23:54 · 中国 江苏 常州 溧阳市 电信
If it's simple, then directly SET/a var
var=!str:~,1!!str:~,1!*!str:~,1!+!str:~1,1!*!str:~1,1!*!str:~1,1!.....
var=!str:~,1!!str:~,1!*!str:~,1!+!str:~1,1!*!str:~1,1!*!str:~1,1!.....
简单!简单!再简单!
Floor 24
Posted 2008-04-12 00:16 · 中国 湖南 长沙 电信
Personally, there is no difference in efficiency between floor 15 and floor 19.
However, it is unnecessary for floor 15 to put the delay variable inside the for.
If you want to prove which one has higher efficiency, it is best to rely on facts.
To find the narcissistic numbers from 1 to 10000 and record the batch processing running time, isn't that a result?
However, it is unnecessary for floor 15 to put the delay variable inside the for.
If you want to prove which one has higher efficiency, it is best to rely on facts.
To find the narcissistic numbers from 1 to 10000 and record the batch processing running time, isn't that a result?
致精致简！
Floor 25
Posted 2008-04-12 00:43 · 中国 陕西 西安 电信
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The so-called "narcissistic number" refers to a three-digit number whose sum of the cubes of its digits is equal to the number itself.
15th floor:
19th floor:
[ Last edited by plp626 on 2008-4-12 at 12:51 AM ]
15th floor:
@echo off
setlocal enabledelayedexpansion
for /l %%i in (100,1,999) do (
set str=%%i
set/a a=!str:~,1!, b=!str:~1,1!, c=!str:~2,1!
set /a var=!a!*!a!*!a!+!b!*!b!*!b!+!c!*!c!*!c!
if !var! equ !str! echo !str!
)
pause
19th floor:
@echo off
setlocal enabledelayedexpansion
for /l %%i in (1,1,9) do for /l %%j in (0,1,9) do for /l %%k in (0,1,9) do (
set/a a=%%i,b=%%j,c=%%k
set num1=!a!!b!!c!
set /a num2=!a!*!a!*!a!+!b!*!b!*!b!+!c!*!c!*!c!
if !num1! equ !num2! echo !num1!
)
pause
[ Last edited by plp626 on 2008-4-12 at 12:51 AM ]
Floor 26
Posted 2008-04-12 07:12 · 中国 四川 成都 双流区 电信
Floor 27
Posted 2008-04-12 14:45 · 中国 陕西 西安 电信
Are the number of loops the same?
Which one is less?
Which is faster, taking each digit or combining several digits?
Which one is less?
Which is faster, taking each digit or combining several digits?
Floor 28
Posted 2008-04-12 15:00 · 中国 湖南 长沙 电信
Originally posted by slore at 2008-4-12 14:45:
Are the number of loops the same?
Which one is less?
Which is faster, taking each digit or combining several digits?
To find the Armstrong numbers from 1 to 10000 and record the batch processing time, wouldn't that give the result?
致精致简！
Floor 29
Posted 2008-04-12 16:09 · 中国 陕西 西安 电信
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Originally posted by 26933062 at 2008-4-12 03:00 PM:
Find the narcissistic numbers from 1 to 10000, and record the batch processing running time, then you will get the result?
The two times are the same, with an error within 0.01 seconds, which is less than the "system" error of %time%.
Floor 30
Posted 2008-04-12 16:31 · 中国 陕西 西安 电信
If you can test up to 99999999999999999999999999999999999...
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