C Program to Check Entered value is Alphabet or not

#include <stdio.h>

#include<conio.h>

void main() 

{

    char a;

    clrscr();

    printf("Enter a character\n ");

    scanf("%c", &a);

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

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

    else

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

  getch();

}

Output

Enter a character

 P

P is an alphabet