## Check whether number is even or odd

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How would I determine whether a given number is even or odd? I've been wanting to figure this out for a long time now and haven't gotten anywhere.

You can use the modulus operator, but that can be slow. If it's an integer, you can do:

```if ( (x & 1) == 0 ) { even... } else { odd... }
```

This is because the low bit will always be set on an odd number.

C Program to Check Whether a Number is Even or Odd, In this example, you will learn to check whether a number entered by the user is even or odd in C programming language To check whether an integer is even or odd, the remainder is calculated when it is divided by 2 using modulus operator %. If remainder is zero, that integer is even if not that integer is odd. If remainder is zero, that integer is even if not that integer is odd.

```if((x%2)==0)
// even
else
// odd
```

C++ Program to Check Whether Number is Even or Odd, To check whether an integer is even or odd, the remainder is calculated when it is divided by 2 using modulus operator %. If remainder is zero, that integer is even  C++ Program to Check Whether Number is Even or Odd Check Whether Number is Even or Odd using Modulus. A program to check whether number is even or odd using modulus is as Example. Output. In the above program, the number num is divided by 2 and its remainder is observed. If the remainder is 0,

If the remainder when you divide by 2 is 0, it's even. `%` is the operator to get a remainder.

C Program to check if number is even or odd, If a number is exactly divisible by 2 then its an even number else it is an odd number. In this article we have shared two ways(Two C programs) to check. The ISODD function is a special function made by Excel to check whether a number is an odd number or not. Only has one argument, which is the number to be checked. If the ISODD function returns TRUE, then the checked number is odd, otherwise is even.

The remainder operator, %, will give you the remainder after dividing by a number.

So `n % 2 == 0` will be true if n is even and false if n is odd.

C program to check whether a given number is EVEN or ODD , To check whether given number is EVEN or ODD, we are checking modulus by dividing number by 2, if the modulus is 0, then it will be completely divisible by 2  If you remember anything at all about math (other than your vow to forget everything you ever knew about math as soon as you were done with school) then you probably recall that it’s pretty easy to determine whether a number is even or odd: if a number can be evenly divided by 2 it’s even; if a number can’t be evenly divided by 2 then it’s odd. That’s all there is to it.

Every even number is divisible by two, regardless of if it's a decimal (but the decimal, if present, must also be even). So you can use the `%` (modulo) operator, which divides the number on the left by the number on the right and returns the remainder...

```boolean isEven(double num) { return ((num % 2) == 0); }
```

How do I check if an integer is even or odd?, A number is even if, when divided by two, the remainder is 0. A number is odd if, when divided by 2, the remainder is 1. // Java public static boolean isOdd(int  (4) Check whether 9 is a odd number. (5) Check whether 13 is a odd number. (6) Check whether 25 is a odd number. (7) Check whether 10 is a odd number. (8) Check whether 16 is a odd number. (9) Check whether 18 is a odd number. (10) Check whether 15 is a odd number. (11) Check whether 19 is a odd number. (12) Check whether 30 is a odd number

Check whether a given number is even or odd, Given a number, check whether it is even or odd. Examples : Input: n = 11 If flag variable gets original value (which is true) back, then n is even. Else n is false. Enter a number: 12 12 is even. In the above program, a Scanner object, reader is created to read a number from the user's keyboard. The entered number is then stored in a variable num. Now, to check whether num is even or odd, we calculate its remainder using % operator and check if it is divisible by 2 or not.

Check a number is odd or even without modulus operator , In the above program, the number num is divided by 2 and its remainder is observed. If the remainder is 0, then the number is even. If the  Enter a number: 43 43 is Odd. Output 2. Enter a number: 18 18 is Even. In this program, we ask the user for the input and check if the number is odd or even.

C++ Program to Check Whether Number is Even or Odd, C programming, exercises, solution: Write a C program to check whether a given number is even or odd. Least significant bit (rightmost) can be used to check if the number is even or odd. For all Odd numbers, rightmost bit is always 1 in binary representation. public static boolean checkOdd(long number){ return ((number & 0x1) == 1); }

• I had got a compile error unless I used `if ( (x & 1) == 0 ) ...`.
• @crush `n % 2 == 0` semantically means `Divide by 2 and check if the remainder is 0`, which is much clearer than `n & 1 == 0` which means `Zero all the bits but leave the least significant bit unchanged and check if the result is 0`. The improved clarity of the first is worth the (probably non-existant) overhead. That is what I meant with premature optimization. If something is slow and you profile it in that part changing `n % 2` to `n & 1` is certainly justified, but doing it beforehand isn't. In general working with the bit operators is a bad idea before profiling.
• @dtech First of all, your opinion is completely subjective. Second of all, you still don't understand what "premature optimization" means. It is a micro optimization, sure. It's not a premature optimization. Premature optimization is revising existing code with "optimizations" without first profiling the existing code to see that it is inefficient. However, knowing beforehand that writing code one way vs. another way is more efficient, and choosing to use the more efficient code, is NOT premature optimization. It is your subjective opinion that `n % 2 == 0` is cleaner than `n & 1 == 0`.
• The mathematical term is modulus, and it has wider-applicability than getting the remainder. `(A % B)` itself can be used as an expression, and that's when things get fun.