To distinguish whether the number is alphabet, number or special character

#include<stdio.h>
#include<conio.h>
int main(void)
{
    unsigned char a;
    printf("Enter Character : ");
    a = getche();
    if((a>64 && a<91) || (a>96 && a<123))
    {
        printf("Alphabet");
    }
    else if(a>47 && a<58)
    {
        printf("Number");
    }
    else
    {
        printf("Special Character");
    }
    return 0;
}