Check if the String Numeric or Alphabetic

Code

#include <stdio.h>
#include <stdint.h>

void classify_string(const char *str) {
    // Your logic here
    bool num = false;
    bool alpha = false;
    bool mixed = false;
    while (*str != '\0') {
        if ((((*str)>='A') && ((*str)<='Z'))||((*str)>='a') && ((*str)<='z')) alpha = true;
        else if (((*str)>='0') && ((*str)<='9')) num = true;
        else mixed = true;
        str++;
    }
    if (mixed) printf("MIXED");
    else if (alpha && num) printf("MIXED");
    else if (alpha) printf("ALPHABETIC");
    else printf("NUMERIC");
}

int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);

    // Remove newline
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    classify_string(str);
    return 0;
}

Solving Approach