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please explain me

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2 2 votes
Why printf("%d",5%-2); is 1, not -1.

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2 2 votes

good one  

Does '%' mean either "mod" or "rem" in C?

In C  %mean   it will give remainder not mod 

First of all  modulo  and %    are different so stop calculating it on  google calculator  ( google calculator is calculating                       a modulo b  )

 7 %  3 -->  1  
 7 % -3 -->  1  
-7 %  3 --> -1  
-7 % -3 --> -1

Modulo as Euclidean division   The wiki Euclidean division asserts 0 ≤ r < |b| which means the remainder aka "modulo operation." is always at least 0

 7 modulo  3 -->  1  
 7 modulo -3 -->  1  
-7 modulo  3 -->  2  
-7 modulo -3 -->  2

Google uses a different definition of modulo 

 
 7 modulo  3 -->  1  
 7 modulo -3 --> -2 
-7 modulo  3 -->  2  
-7 modulo -3 --> -1

coming to actual question how you calculate a% b      ,  remember  in result of a%b will take sign of numerator  ,  so you have to  just calculate a%b  as  you do it for  positive numbers , then see numerator i.e. a      sign if   sign of a  is  negative then   put  (-)  with your answer  , else if a is positive no need to do anythinh

Thank you !!

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