How to Check input is Alphabet or not

#include <stdio.h>

#include <conio.h>



main()

{



char c;

printf("Enter a character: ");

scanf("%c",&c);





if((c>='a'&& c<='z') || (c>='A'&& c<='Z')  )

{

printf("%c is an alphabet",c);



}

else

{

printf("%c is not an alphabet",c);



}











}

How to Find a year is a leap year

#include <stdio.h>

#include <conio.h>



main()

{



int year;



printf("Enter the year: ");

scanf("%d",&year);



if(year%4==0)

{



printf("%d is a leap year",year);

}



else

{

printf("%d is a not leap year",year);



}















}

How to Check a number is Even or Odd

#include <stdio.h>

#include <conio.h>





main()

{

int n;



printf("ENTER A NUMBER: ");

scanf("%d",&n);



if(n%2==0)

{

printf("%d is an even number",n);

}



else

{

printf("%d is an Odd number",n);



}







}



//2,4,6,8,10,....even

//1,3,5,7,9...... odd