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C program to check odd or even using modulus operator
#include<stdio.h>

main()
{
int n;

printf("Enter an integer\n");
scanf("%d",&n);

if ( n%2 == 0 )
printf("Even\n");
else
printf("Odd\n");

return 0;
}

C program to check odd or even using bitwise operator

#include<stdio.h>

main()
{
int n;

printf("Enter an integer\n");
scanf("%d",&n);

if ( n & 1 == 1 )
printf("Odd\n");
else
printf("Even\n");

return 0;
}

C program to check odd or even without using bitwise or modulus operator
#include<stdio.h>

main()
{
int n;

printf("Enter an integer\n");
scanf("%d",&n);

if ( (n/2)*2 == n )
printf("Even\n");
else
printf("Odd\n");

return 0;
}

Find odd or even using conditional operator
#include<stdio.h>

main()
{
int n;

printf("Enter an integer\n");
scanf("%d",&n);

n%2 == 0 ? printf("Even number\n") : printf("Odd number\n");

return 0;
}

c program to check whether input alphabet is a vowel or not
This code checks whether an input alphabet is a vowel or not. Both lower-case and upper-case are checked.
C programming code
#include <stdio.h>

main()
{
char ch;

printf("Enter a character\n");
scanf("%c", &ch);

if (ch == 'a' ch == 'A' ch == 'e' ch == 'E' ch == 'i' ch == 'I' ch =='o' ch=='O' ch == 'u' || ch == 'U')
printf("%c is a vowel.\n", ch);
else
printf("%c is not a vowel.\n", ch);

return 0;
}
Output:

a
a is vowel

Check vowel using switch statement
#include <stdio.h>

main()
{
char ch;

printf("Enter a character\n");
scanf("%c", &ch);

switch(ch)
{
case 'a':
case 'A':
case 'e':
case 'E':
case 'i':
case 'I':
case 'o':
case 'O':
case 'u':
case 'U':
printf("%c is a vowel.\n", ch);
break;
default:
printf("%c is not a vowel.\n", ch);
}

return 0;
}

Function to check vowel
int check_vowel(char a)
{
if (a >= 'A' && a <= 'Z')
a = a + 'a' - 'A'; /* Converting to lower case or use a = a + 32 */

if (a == 'a' a == 'e' a == 'i' a == 'o' a == 'u')
return 1;

return 0;
}

c program to check leap year
c program to check leap year: c code to check leap year, year will be entered by the user. Please read the leap year article before reading the code, it will help you to understand the program.
C programming code
#include <stdio.h>

int main()
{
int year;

printf("Enter a year to check if it is a leap year\n");
scanf("%d", &year);

if ( year%400 == 0)
printf("%d is a leap year.\n", year);
else if ( year%100 == 0)
printf("%d is not a leap year.\n", year);
else if ( year%4 == 0 )
printf("%d is a leap year.\n", year);
else
printf("%d is not a leap year.\n", year);

return 0;
}

add digits of number in c
C program to add digits of a number: Here we are using modulus operator(%) to extract individual digits of number and adding them.
C programming code
#include <stdio.h>

main()
{
int n, sum = 0, remainder;

printf("Enter an integer\n");
scanf("%d",&n);

while(n != 0)
{
remainder = n % 10;
sum = sum + remainder;
n = n / 10;
}

printf("Sum of digits of entered number = %d\n",sum);

return 0;
}

Add digits using recursion
#include <stdio.h>

int add_digits(int);

int main() {
int n, result;

scanf("%d", &n);

result = add_digits(n);

printf("%d\n", result);

return 0;
}

int add_digits(int n) {
static int sum = 0;

if (n == 0) {
return 0;
}

sum = n%10 + add_digits(n/10);

return sum;
}

Factorial program in c using for loop
: Here we find factorial using for loop.
#include <stdio.h>

int main()
{
int c, n, fact = 1;

printf("Enter a number to calculate it's factorial\n");
scanf("%d", &n);

for (c = 1; c <= n; c++)
fact = fact * c;

printf("Factorial of %d = %d\n", n, fact);

return 0;
}

Factorial program in c using function
#include <stdio.h>

long factorial(int);

int main()
{
int number;
long fact = 1;

printf("Enter a number to calculate it's factorial\n");
scanf("%d", &number);

printf("%d! = %ld\n", number, factorial(number));

return 0;
}

long factorial(int n)
{
int c;
long result = 1;

for (c = 1; c <= n; c++)
result = result * c;

return result;
}

Factorial program in c using recursion
#include<stdio.h>

long factorial(int);

int main()
{
int num;
long f;

printf("Enter a number to find factorial\n");
scanf("%d", &num);

if (num < 0)
printf("Negative numbers are not allowed.\n");
else
{
f = factorial(num);
printf("%d! = %ld\n", num, f);
}

return 0;
}

long factorial(int n)
{
if (n == 0)
return 1;
else
return(n * factorial(n-1));
}