C Program to Check Whether a Number is Even or Odd
The number is Even or Odd Program in C
We can determine whether a number is Even or Odd program in C. This can be tested using different methods. The test can be done using simple methods such as
- Testing the number’s divisibility by 2.
- If the remainder is zero, the number is even.
- If the remainder is not zero, then the number is odd.
The following algorithm describes how a C program can test if a number is even or odd.
Example : Number is 24 It is an even number because it is exactly divisible by 2 i.e 24 % 2 -> 0 (leaves no remainder on modulus/remainder operator) Number is 15 It is odd number because it is not divisible by 2 i.e 15 % 2 ->1 (leaves 1 remainder on modulus/remainder operator)
| Time Complexity | O(1) |
| Space Complexity | O(1) |
Method 1
For user input number
- If number % 2 == 0
- If true then the number is even
- Else, the number has to odd
Here % is called as modulo/remainder operator
Code
Run
#include <stdio.h>
int main ()
{
int number;
printf ("Insert a number \n");
scanf ("%d", &number);
//Checking if the number is divisible by 2
if (number % 2 == 0)
printf ("Even");
else
printf ("Odd");
return 0;
}
Output
Insert a number
10
Even
Method 2
For this method, we use the ternary operator in C
For user input number
- If number % 2 == 0
- If true then the number is even
- Else, the number has to odd
Here % is called as modulo/remainder operator
Code
Run
#include <stdio.h>
int main ()
{
int number;
printf ("Insert a number \n");
scanf ("%d", &number);
//Checking if the number is divisible by 2
number % 2 == 0? printf ("Even"):printf ("Odd");
return 0;
}
Output
Insert a number
15
Odd
Method 3
For this method, we use the bitwise operator, in this case, bitwise and (&) How this works is below- For any number following operation : (num & 1) will always result
- 1: If num is odd
- 0: if num is even
// 5 (in binary) : 00000101
// 1 (in binary) : 00000001
0 0 0 0 0 1 0 1
& 0 0 0 0 0 0 0 1
- - - - - - - - -
0 0 0 0 0 0 0 1
Code
Run
#include <stdio.h>
// Returns true if n is even, else odd
int isEven(int num)
{
// num & 1 is 1, then odd, else even
return (!(num & 1));
}
// Driver code
int main()
{
int num;
printf("Enter the number: ");
scanf("%d",&num);
isEven(num)? printf ("Even"):printf ("Odd");
return 0;
}
Output
Insert a number
5
Odd
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