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Batch Script use Math to Convert a positive number to negative

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0

I have this code:

set /a A=1 + 2



echo A=%A%

the output is A=3

How can I convert this into a negative value? (ie, -3)

windows batch-file cmd.exe

share|improve this question

edited Feb 13 at 12:20

Hennes

59.3k793143

asked Feb 13 at 8:20

Hüseyin Teoman DenizHüseyin Teoman Deniz

204

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Simply multiply with -1 set /a A*=-1
  
  – LotPings
  Feb 13 at 8:24
  

  
  
  
  

add a comment | 

0

I have this code:

set /a A=1 + 2



echo A=%A%

the output is A=3

How can I convert this into a negative value? (ie, -3)

windows batch-file cmd.exe

share|improve this question

edited Feb 13 at 12:20

Hennes

59.3k793143

asked Feb 13 at 8:20

Hüseyin Teoman DenizHüseyin Teoman Deniz

204

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  Simply multiply with -1 set /a A*=-1
  
  – LotPings
  Feb 13 at 8:24
  

  
  
  
  

add a comment | 

I have this code:

set /a A=1 + 2



echo A=%A%

the output is A=3

How can I convert this into a negative value? (ie, -3)

windows batch-file cmd.exe

share|improve this question

edited Feb 13 at 12:20

Hennes

59.3k793143

asked Feb 13 at 8:20

Hüseyin Teoman DenizHüseyin Teoman Deniz

204

set /a A=1 + 2



echo A=%A%

share|improve this question

edited Feb 13 at 12:20

Hennes

59.3k793143

asked Feb 13 at 8:20

Hüseyin Teoman DenizHüseyin Teoman Deniz

204

share|improve this question

edited Feb 13 at 12:20

Hennes

59.3k793143

asked Feb 13 at 8:20

Hüseyin Teoman DenizHüseyin Teoman Deniz

204

edited Feb 13 at 12:20

Hennes

59.3k793143

edited Feb 13 at 12:20

Hennes

59.3k793143

asked Feb 13 at 8:20

Hüseyin Teoman DenizHüseyin Teoman Deniz

204

asked Feb 13 at 8:20

Hüseyin Teoman DenizHüseyin Teoman Deniz

204

2 Answers
2

active

oldest

votes

0

Simply multiply it with -1:

set /a A=1 + 2



set /a A=%A%*-1

echo A=%A%

share|improve this answer

answered Feb 13 at 12:09

rahuldottechrahuldottech

3,52432548

add a comment | 

0

Just negate it with the - operator

set A=2

set /a A = -A

That's the standard way in almost every programming language. It should also be more readable and slightly more efficient than multiplying with -1

In fact you don't even need /A in this case, set A=-%A% also works

share

answered 7 mins ago

phuclvphuclv

10.4k64295

add a comment | 

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0

Simply multiply it with -1:

set /a A=1 + 2



set /a A=%A%*-1

echo A=%A%

share|improve this answer

answered Feb 13 at 12:09

rahuldottechrahuldottech

3,52432548

add a comment | 

0

Simply multiply it with -1:

set /a A=1 + 2



set /a A=%A%*-1

echo A=%A%

share|improve this answer

answered Feb 13 at 12:09

rahuldottechrahuldottech

3,52432548

add a comment | 

Simply multiply it with -1:

set /a A=1 + 2



set /a A=%A%*-1

echo A=%A%

share|improve this answer

answered Feb 13 at 12:09

rahuldottechrahuldottech

3,52432548

set /a A=1 + 2



set /a A=%A%*-1

echo A=%A%

share|improve this answer

answered Feb 13 at 12:09

rahuldottechrahuldottech

3,52432548

answered Feb 13 at 12:09

rahuldottechrahuldottech

3,52432548

answered Feb 13 at 12:09

rahuldottechrahuldottech

3,52432548

0

Just negate it with the - operator

set A=2

set /a A = -A

That's the standard way in almost every programming language. It should also be more readable and slightly more efficient than multiplying with -1

In fact you don't even need /A in this case, set A=-%A% also works

share

answered 7 mins ago

phuclvphuclv

10.4k64295

add a comment | 

0

Just negate it with the - operator

set A=2

set /a A = -A

That's the standard way in almost every programming language. It should also be more readable and slightly more efficient than multiplying with -1

In fact you don't even need /A in this case, set A=-%A% also works

share

answered 7 mins ago

phuclvphuclv

10.4k64295

add a comment | 

Just negate it with the - operator

set A=2

set /a A = -A

That's the standard way in almost every programming language. It should also be more readable and slightly more efficient than multiplying with -1

In fact you don't even need /A in this case, set A=-%A% also works

share

answered 7 mins ago

phuclvphuclv

10.4k64295

set A=2

set /a A = -A

share

answered 7 mins ago

phuclvphuclv

10.4k64295

answered 7 mins ago

phuclvphuclv

10.4k64295

answered 7 mins ago

phuclvphuclv

10.4k64295