What s the syntax for mod in java

Question

As an example in pseudocode   if   a mod 2     0        isEven   true    else       isEven   false

User · Answer

Here is the representation of your pseudo-code in minimal Java code;

boolean isEven = a % 2 == 0;

I'll now break it down into its components. The modulus operator in Java is the percent character (%). Therefore taking an int % int returns another int. The double equals (==) operator is used to compare values, such as a pair of ints and returns a boolean. This is then assigned to the boolean variable 'isEven'. Based on operator precedence the modulus will be evaluated before the comparison.

User · Answer

Since everyone else already gave the answer  I ll add a bit of additional context    the  modulus  operator is actually performing the remainder operation   The difference between mod and rem is subtle  but important    -1 mod 2  would normally give 1   More specifically given two integers  X and Y  the operation  X mod Y  tends to return a value in the range  0  Y    Said differently  the modulus of X and Y is always greater than or equal to zero  and less than Y   Performing the same operation with the     or rem operator maintains the sign of the X value  If X is negative you get a result in the range  -Y  0    If X is positive you get a result in the range  0  Y      Often this subtle distinction doesn t matter   Going back to your code question  though  there are multiple ways of solving for  evenness    The first approach is good for beginners  because it is especially verbose      Option 1  Clearest way for beginners boolean isEven  if   a   2     0      isEven   true   else     isEven   false     The second approach takes better advantage of the language  and leads to more succinct code   Don t forget that the    operator returns a boolean       Option 2  Clear  succinct  code boolean isEven     a   2     0     The third approach is here for completeness  and uses the ternary operator   Although the ternary operator is often very useful  in this case I consider the second approach superior      Option 3  Ternary operator boolean isEven     a   2     0    true   false    The fourth and final approach is to use knowledge of the binary representation of integers   If the least significant bit is 0 then the number is even   This can be checked using the bitwise-and operator   amp     While this approach is the fastest  you are doing simple bit masking instead of division   it is perhaps a little advanced complicated for a beginner      Option 4  Bitwise-and boolean isEven     a  amp  1     0     Here I used the bitwise-and operator  and represented it in the succinct form shown in option 2   Rewriting it in Option 1 s form  and alternatively Option 3 s  is left as an exercise to the reader      Hope that helps

User · Answer

In Java  the mod operation can be performed as such   Math floorMod a  b    Note  The mod operation is different from the remainder operation  In Java  the remainder operation can be performed as such   a   b

User · Answer

if  a   2    0      else

User · Answer

The modulo operator is    percent sign   To test for evenness or generally do modulo for a power of 2  you can also use  amp   the and operator  like isEven      a  amp  1

User · Answer

The code runs much faster without using modulo   public boolean isEven int a       return    a  amp  1     0       public boolean isOdd int a       return    a  amp  1     1

User · Answer

An alternative to the code from  Cody    Using the modulus operator   bool isEven    a   2     0    I think this is marginally better code than writing if else  because there is less duplication  amp  unused flexibility   It does require a bit more brain power to examine  but the good naming of isEven compensates

User · Answer

An alternative to the code from  Cody    Using the modulus operator   bool isEven    a   2     0    I think this is marginally better code than writing if else  because there is less duplication  amp  unused flexibility   It does require a bit more brain power to examine  but the good naming of isEven compensates

User · Answer

Another way is   boolean isEven   false  if  a   2     0        isEven   true      But easiest way is still    boolean isEven    a   2     0    Like  Steve Kuo said

User · Answer

An alternative to the code from  Cody    Using the modulus operator   bool isEven    a   2     0    I think this is marginally better code than writing if else  because there is less duplication  amp  unused flexibility   It does require a bit more brain power to examine  but the good naming of isEven compensates

User · Answer

you should examine the specification before using  remainder  operator      http   java sun com docs books jls third edition html expressions html 15 17 3     bad enough implementation of isEven method  for fun  so any worse  boolean isEven int num        num    10      if num    1         return false      else if num    0         return true      else        return isEven num   2     isEven   isEven a

User · Answer

In Java  the mod operation can be performed as such   Math floorMod a  b    Note  The mod operation is different from the remainder operation  In Java  the remainder operation can be performed as such   a   b

User · Answer

Instead of the modulo operator  which has slightly different semantics  for non-negative integers  you can use the remainder operator    For your exact example   if   a   2     0        isEven   true    else       isEven   false      This can be simplified to a one-liner   isEven    a   2     0

User · Answer

Also  mod can be used like this   int a   7  b   a   2    b would equal 1   Because 7   2   1

User · Answer

While it s possible to do a proper modulo by checking whether the value is negative and correct it if it is  the way many have suggested   there is a more compact solution    a   b   b    b   This will first do the modulo  limiting the value to the -b -   b range and then add b in order to ensure that the value is positive  letting the next modulo limit it to the 0 -  b range   Note  If b is negative  the result will also be negative

User · Answer

Java actually has no modulo operator the way C does    in Java is a remainder operator  On positive integers  it works exactly like modulo  but it works differently on negative integers and  unlike modulo  can work with floating point numbers as well  Still  it s rare to use   on anything but positive integers  so if you want to call it a modulo  then feel free

User · Answer

While it s possible to do a proper modulo by checking whether the value is negative and correct it if it is  the way many have suggested   there is a more compact solution    a   b   b    b   This will first do the modulo  limiting the value to the -b -   b range and then add b in order to ensure that the value is positive  letting the next modulo limit it to the 0 -  b range   Note  If b is negative  the result will also be negative

User · Answer

Since everyone else already gave the answer  I ll add a bit of additional context    the  modulus  operator is actually performing the remainder operation   The difference between mod and rem is subtle  but important    -1 mod 2  would normally give 1   More specifically given two integers  X and Y  the operation  X mod Y  tends to return a value in the range  0  Y    Said differently  the modulus of X and Y is always greater than or equal to zero  and less than Y   Performing the same operation with the     or rem operator maintains the sign of the X value  If X is negative you get a result in the range  -Y  0    If X is positive you get a result in the range  0  Y      Often this subtle distinction doesn t matter   Going back to your code question  though  there are multiple ways of solving for  evenness    The first approach is good for beginners  because it is especially verbose      Option 1  Clearest way for beginners boolean isEven  if   a   2     0      isEven   true   else     isEven   false     The second approach takes better advantage of the language  and leads to more succinct code   Don t forget that the    operator returns a boolean       Option 2  Clear  succinct  code boolean isEven     a   2     0     The third approach is here for completeness  and uses the ternary operator   Although the ternary operator is often very useful  in this case I consider the second approach superior      Option 3  Ternary operator boolean isEven     a   2     0    true   false    The fourth and final approach is to use knowledge of the binary representation of integers   If the least significant bit is 0 then the number is even   This can be checked using the bitwise-and operator   amp     While this approach is the fastest  you are doing simple bit masking instead of division   it is perhaps a little advanced complicated for a beginner      Option 4  Bitwise-and boolean isEven     a  amp  1     0     Here I used the bitwise-and operator  and represented it in the succinct form shown in option 2   Rewriting it in Option 1 s form  and alternatively Option 3 s  is left as an exercise to the reader      Hope that helps

User · Answer

Also  mod can be used like this   int a   7  b   a   2    b would equal 1   Because 7   2   1

User · Answer

To get Java s    REM  operation to work like MOD for negative X and positive Y values  you can use this method   private int mod int x  int y        int result   x   y      if  result  lt  0                result    y            return result      or with the ternary operator  shorter  but not possible or less efficient in some situations    private int mod int x  int y        int result   x   y      return result  lt  0  result   y   result

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In Java it is the   operator  15 17 3  Remainder Operator    Note that there is also floorMod in the java lang Math class which will give a different result from   for arguments with different signs   public static int floorMod  int x  int y

User · Answer

Java actually has no modulo operator the way C does    in Java is a remainder operator  On positive integers  it works exactly like modulo  but it works differently on negative integers and  unlike modulo  can work with floating point numbers as well  Still  it s rare to use   on anything but positive integers  so if you want to call it a modulo  then feel free

User · Answer

To get Java s    REM  operation to work like MOD for negative X and positive Y values  you can use this method   private int mod int x  int y        int result   x   y      if  result  lt  0                result    y            return result      or with the ternary operator  shorter  but not possible or less efficient in some situations    private int mod int x  int y        int result   x   y      return result  lt  0  result   y   result

User · Answer

Here is the representation of your pseudo-code in minimal Java code;

boolean isEven = a % 2 == 0;

I'll now break it down into its components. The modulus operator in Java is the percent character (%). Therefore taking an int % int returns another int. The double equals (==) operator is used to compare values, such as a pair of ints and returns a boolean. This is then assigned to the boolean variable 'isEven'. Based on operator precedence the modulus will be evaluated before the comparison.

User · Answer

The code runs much faster without using modulo   public boolean isEven int a       return    a  amp  1     0       public boolean isOdd int a       return    a  amp  1     1

User · Answer

In Java it is the   operator  15 17 3  Remainder Operator    Note that there is also floorMod in the java lang Math class which will give a different result from   for arguments with different signs   public static int floorMod  int x  int y

User · Answer

Instead of the modulo operator  which has slightly different semantics  for non-negative integers  you can use the remainder operator    For your exact example   if   a   2     0        isEven   true    else       isEven   false      This can be simplified to a one-liner   isEven    a   2     0

User · Answer

if  a   2    0      else

User · Answer

The modulo operator is    percent sign   To test for evenness or generally do modulo for a power of 2  you can also use  amp   the and operator  like isEven      a  amp  1

User · Answer

Another way is   boolean isEven   false  if  a   2     0        isEven   true      But easiest way is still    boolean isEven    a   2     0    Like  Steve Kuo said

User · Answer

Also  mod can be used like this   int a   7  b   a   2    b would equal 1   Because 7   2   1

User · Answer

if  a   2    0      else

User · Answer

As others have pointed out  the    remainder  operator is not the same as the mathematical mod modulus operation function      mod vs        The x mod n function maps x to n in the range of  0 n     Whereas the x   n operator maps x to n in the range of  -n n     In order to have a method to use the mathematical modulus operation and not  care about the sign in front of x one can use     x   n    n    n   Maybe this picture helps understand it better  I had a hard time wrapping my head around this first

User · Answer

if  a   2    0      else

User · Answer

As others have pointed out  the    remainder  operator is not the same as the mathematical mod modulus operation function      mod vs        The x mod n function maps x to n in the range of  0 n     Whereas the x   n operator maps x to n in the range of  -n n     In order to have a method to use the mathematical modulus operation and not  care about the sign in front of x one can use     x   n    n    n   Maybe this picture helps understand it better  I had a hard time wrapping my head around this first

User · Answer

The remainder operator in Java is   and the modulo operator can be expressed as  public int mod int i  int j      int rem   i   j    if  j  lt  0  amp  amp  rem  gt  0          return rem   j        if  j  gt  0  amp  amp  rem  lt  0          return rem   j        return rem

User · Answer

Here is the representation of your pseudo-code in minimal Java code;

boolean isEven = a % 2 == 0;

I'll now break it down into its components. The modulus operator in Java is the percent character (%). Therefore taking an int % int returns another int. The double equals (==) operator is used to compare values, such as a pair of ints and returns a boolean. This is then assigned to the boolean variable 'isEven'. Based on operator precedence the modulus will be evaluated before the comparison.

User · Answer

Here is the representation of your pseudo-code in minimal Java code;

boolean isEven = a % 2 == 0;

I'll now break it down into its components. The modulus operator in Java is the percent character (%). Therefore taking an int % int returns another int. The double equals (==) operator is used to compare values, such as a pair of ints and returns a boolean. This is then assigned to the boolean variable 'isEven'. Based on operator precedence the modulus will be evaluated before the comparison.

User · Answer

The modulo operator is    percent sign   To test for evenness or generally do modulo for a power of 2  you can also use  amp   the and operator  like isEven      a  amp  1

User · Answer

The modulo operator is    percent sign   To test for evenness or generally do modulo for a power of 2  you can also use  amp   the and operator  like isEven      a  amp  1

User · Answer

An alternative to the code from  Cody    Using the modulus operator   bool isEven    a   2     0    I think this is marginally better code than writing if else  because there is less duplication  amp  unused flexibility   It does require a bit more brain power to examine  but the good naming of isEven compensates

User · Answer

Instead of the modulo operator  which has slightly different semantics  for non-negative integers  you can use the remainder operator    For your exact example   if   a   2     0        isEven   true    else       isEven   false      This can be simplified to a one-liner   isEven    a   2     0

User · Answer

Also  mod can be used like this   int a   7  b   a   2    b would equal 1   Because 7   2   1

User · Answer

you should examine the specification before using  remainder  operator      http   java sun com docs books jls third edition html expressions html 15 17 3     bad enough implementation of isEven method  for fun  so any worse  boolean isEven int num        num    10      if num    1         return false      else if num    0         return true      else        return isEven num   2     isEven   isEven a

User · Answer

Instead of the modulo operator  which has slightly different semantics  for non-negative integers  you can use the remainder operator    For your exact example   if   a   2     0        isEven   true    else       isEven   false      This can be simplified to a one-liner   isEven    a   2     0

User · Answer

The remainder operator in Java is   and the modulo operator can be expressed as  public int mod int i  int j      int rem   i   j    if  j  lt  0  amp  amp  rem  gt  0          return rem   j        if  j  gt  0  amp  amp  rem  lt  0          return rem   j        return rem

[java] What's the syntax for mod in java

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