#include <stdio.h>
#include <ctype.h>
 
int main(void) 
{
    char a;
 
    printf("Enter a character: ");
    scanf("%c", &a);
 
    if (islower(a))
        printf("\nYou entered a lowercase letter.\n");
    else if (isupper(a))
        printf("\nYou entered an uppercase letter.\n");
    else if (isdigit(a))
        printf("\nYou entered a digit.\n");
    else if (isspace(a))
        printf("\nYou entered a whitespace character.\n");
    else
        printf("\nYou entered a special character.\n");
 
    return 0;
}

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