How to Do Division in Java (Integer and Floating Point)

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There are two types of division in Java—integer division and floating-point division. Both types use the forward slash (/) symbol as the operator, following the format dividend / divisor . [1] Read on to learn how to divide two integers (non-decimal whole numbers) to receive an integer quotient, and how to use floating point division to get a decimal result.

Method 1
Method 1 of 2:

Integer Division

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    For example, if you were to divide 7 by 3 on paper, you'd get 2 with a remainder of 1. But when you divide two integers in Java, the remainder will be removed and the answer will just be 2. [2] To use integer division, you'd use this syntax: 
     int 
 a 
 = 
 7 
 ; 
 int 
 b 
 = 
 3 
 ; 
 int 
 result 
 = 
 a 
 / 
 b 
 ; 
 // result will be 2
    • Dividing two integers always results in an integer. If you want to get a decimal result from dividing two integers, use floating point division .
    • If you try to divide an integer by 0 using integer division, you'll get an ArithmeticException error at runtime, even if the program compiles fine. [3]
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    Method 2
    Method 2 of 2:

    Floating point division

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      You can also use float division if you are dividing two numbers and want a decimal result. To use this division type, set the dividend and divisor to a float. [4] With our example of 7 divided by 3, our code would look like this: 
       float 
 a 
 = 
 7.0f 
 ; 
 float 
 b 
 = 
 3.0f 
 ; 
 int 
 result 
 = 
 a 
 / 
 b 
 ; 
 // result will be 2.33
      • When dividing by zero with floating point division, the result will be NaN (Not a Number). [5]

    Community Q&A

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    • Question
      If 'a' variable is divisible by 2 then print 'a' is even otherwise print odd.
      Jessie
      Community Answer
      Complexified: if (a%2 == 0) { System.out.println("even"); } else { System.out.println("odd"); Ternary Operator: System.out.println((a%2 == 0) ? "even" : "odd"); Explanation: "%" is "Modulus", which returns the remainder after dividing the two numbers. Only even numbers can be divided by two without remainder (0). Ternary: You can put ternary operators (([condition]) ? [statement if true] : [statement if false]) in a println() function but you can't put println() functions in ternary operators
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        • When dividing mixed integer and floating point numbers, the floating point values ( float or double ) are automatically converted to the double type when dividing. [6]
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        References

        1. ↑ https://codegym.cc/groups/posts/integer-division-java
        2. ↑ https://mathworld.wolfram.com/IntegerDivision.html
        3. ↑ https://docs.oracle.com/javase/7/docs/api/java/lang/ArithmeticException.html
        4. ↑ https://github.com/processing/processing/wiki/Troubleshooting
        5. ↑ https://docs.oracle.com/javase/specs/jls/se15/html/jls-15.html#jls-15.17
        6. ↑ https://learn.saylor.org/mod/book/tool/print/index.php?id=26807

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