33 - WAP to check whether character is Alphabet, Hexadecimal, Control Character or Alphanumeric in C

This program is to check whether the Entered character is alphabet, hexadecimal, Control character or alphanumeric using function.

Program Code:

/* This program is to check whether the Entered character is alphabet, hexadecimal, Control character or alphanumeric using function in C. */
#include <stdio.h>
//this function will check alphabets or not
void alpha( char ch )
{
 if ( ch >= 65 && ch <= 90 || ch >= 97 && ch <= 122 )
  printf("You Entered is an Alphabet!\n");
 else 
  printf ("You Entered is Not an Alphabet!\n");
}

//this function will check hexadecimal or not
void hexa( char ch )
{
 if ( ch >= '0' && ch <= '9' || ch >= 'a' && ch <= 'f' || ch >= 'A' && ch <= 'F' )
  printf("You Entered is an Hexadecimal Number!\n");
 else 
  printf ("You Entered is Not a Hexadecimal Number!\n");
}

// this function will check control character or not
void control( char ch )
{
 if ( ch >= 0 && ch <= 32 )
  printf("You Entered is a Control Character!\n");
 else 
  printf ("You Entered is Not a Control Character!\n"); 
}

//to check alphanumeric or not
void alphanumeric( char ch )
{
 if ( ch >= 65 && ch <= 90 || ch >= 97 && ch <= 122 || ch >= '0' && ch <= '9' )
  printf("You Entered an Alphanumeric Number!\n");
 else 
  printf ("You Entered is Not an Alphanumeric Number!\n");
}

//main function
int main()
{
 // declaration of variable
 int choice;
 char num1, num2, num3, num4;
 //this is to run the program again
 while (1)
 {
  //choose what you want to check
  printf ("1. Alphabet\n2. Hexadecimal\n3. Control Character\n4. Alphanumeric\n");  
  printf ("Enter your Choice : ");  
  scanf ("%d", &choice);

  switch (choice)
  {

   case 1:
    //asking to enter an alphabate
    printf ("Enter an Alphabet : ");
    getchar();
    scanf ("%c", &num1);
    //function call
    alpha( num1 );
    break;

   case 2:
    //asking user to enter an no
    printf ("Enter an Hexadecimal Number : ");
    getchar();
    scanf ("%c", &num2);
    //calling the hexa function
    hexa (num2);
    break;

   case 3:
    //asking the user to enter an no
    printf ("Enter an Control Character : ");
    getchar();
    getchar();
    getchar();
    getchar();
    scanf ("%c", &num3);
    //calling the function
    control (num3);
    break;

   case 4:
    printf ("Enter an Alpha Numeric Character : ");
    getchar();
    scanf ("%c", &num4);
    getchar();
    //calling the function
    alphanumeric (num4);
    break;

   default:
    printf("Invalid Entry!\n");
    break;
  }

  //this loop is to run the program again
  char yes;
  printf("\nTo Continue ['Y'/'n'] : ");
  getchar();
  yes=getchar();
  if (!( yes == 'y' || yes == 'Y' ))
  {
   break;
  }
 }
 return 0;
}

Program Output: