how to use something like if and else in batch

Question

@echo off
mode 1000
goto block1


:block1
echo color
goto block2


:block2
pause
set /a num=%random% %%5
goto 0

:0
if num == 0 goto a
goto 1


:1
if num == 1 goto b
goto 2


:2
if num == 2 goto c
goto 3


:3
if num == 3 goto d
goto 4


:4
if num == 4 goto e
goto 5


:5 
if num == 5 goto f
goto 0

:a
color 0a
goto block2


:b
color 0b
goto block2


:c
color 0c
goto block2


:d
color 0d
goto block2


:e
color 0e
goto block2


:f
color 0f
goto block2

i want to make a color sign witch changes colors and i would like use simething like this . but i cant use else in batch and it would need something like that

What exactly are you asking, and what's not working with this? — Jeff Zeitlin
– Jeff Zeitlin, Commented Sep 7, 2017 at 18:19
Possible duplicate of How to use if - else structure in a batch file? — Alejandro
– Alejandro, Commented Sep 7, 2017 at 18:32
In batch files the syntax to refer to a variable name (num) differs from the syntax to obtain the variable content (%num%) — MC ND
– MC ND, Commented Sep 7, 2017 at 18:34

Stephan · Accepted Answer · 2017-09-08 17:52:14Z

0

From batch view point nearly all the gotos are useless and only result in spaghetti code.
You are aware that a color stement will affect the whole screen?
%random% modulus 5 can only return 0..4

Your code shortened :

@echo off
mode 1000
echo color
:block2
pause
set /a num=%random% %%5
if %num% == 0 color 0a
if %num% == 1 color 0b
if %num% == 2 color 0c
if %num% == 3 color 0d
if %num% == 4 color 0e
goto block2

edited Sep 8, 2017 at 17:52

Stephan

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answered Sep 7, 2017 at 20:14

user6811411

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2 Comments

Aacini Over a year ago

Simpler: initialize set "color=abcde" and then use color !color:~%num%,1! instead of all those if's (with Delayed Expansion Enabled).

user6811411 Over a year ago

That was my first thought too, but wanted to stay with the simple code of OP @Aacini

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