Today we will learn how to check odd or even program in C.we will also learn Even and Odd program in c using different methods. Before start learning, we will make you know what is even number and odd number.

## What is Even Number?

The number is said to be even if and only if the number is divisible by 2.

For Example 2,4,6,8 and so on.

## What is Odd Number?

The number is said to be Odd if and only if the number is not divisible by 2.

For Example 1,3,5,7 and so on.

## Odd and even Number Algorithm

1 Step: START.

2 Step: Enter the Number to Check.

3 Step: if Number is divisible by 2 then the Number is Even.

4 Step: Else Number is Odd.

5 Step: Print the Output.

6 Step: STOP.

Odd and Even Program Flowchart:

## 1. Odd or Even Program in C Using Modulus Operator

In this program, we will ask the user to enter the number which the user wants to check whether the number is odd or even. After that Compiler will check the number and display the output on the Screen.

```#include <stdio.h>
int main()
{
int n;
printf("Enter a Number to Check Even or Odd\n");
scanf("%d", &n);
if (n%2 == 0)
printf("The Number is Even\n");
else
printf("The Number is Odd\n");
return 0;
}```

Output:

## 2. Odd or Even Program in C Using Conditional Operator

In this program we will use Conditional Operator to Check whether the given number is Odd or even.

Syntax of Conditional Statement:

Condition? 1st printf statement : 2nd printf statement.

The Condition statement returns TRUE if the condition is Correct and return FALSE if the condition is not Correct.

```#include <stdio.h>
int main()
{
int num;
printf("Enter an integer: ");
scanf("%d", &num);
// conditional operator
(num % 2 == 0) ? printf("%d is even.", num) : printf("%d is odd.", num);
return 0;
}```

Output:

## 3. Using Bitwise Operator

In this program we will use bitwise operator to check whether the number is even or odd.

```#include <stdio.h>
int main()
{
int n;
printf("Enter the number to check even or odd\n");
scanf("%d", &n);
if (n & 1 == 1)
printf("The number is Odd\n");
else
printf("The number is Even\n");
return 0;
}```

Output:

## 4. Even or Odd Program without Using Bitwise & Modulus Operator

Till now we use Bitwise and Modulus Operators.But in this program, we will not use this operators.

```#include <stdio.h>
int main()
{
int n;
printf("Enter the number to check even or odd\n");
scanf("%d", &n);
if ((n/2)*2 == n)
printf("the number is Even\n");
else
printf("the number is Odd\n");
return 0;
}```

Output:

In C Language when we divide the two integers we get result as integer only.So we can use it to find whether the number is even or odd.

Even numbers are in the form 2*n and odd numbers are in the form (2*n+1) where n is an integer value.If we divide number by 2 and multiply it by 2 if the number is same then the number is even else the number is odd.

## 5. Program to print Even Numbers upto 100

In this program, we will print the even numbers upto 100.

```#include<stdio.h>
#include<conio.h>
void main()
{
int n=2;
while(n<=100)
{
printf("  %d",n);
n=n+2;
}
}```

Output: