Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    uint8_t num = 0;
    uint8_t alp = 0;
    uint8_t oth = 0;
    int i=0;
    while (str[i] != '\0') {
        if ((str[i] >= '0') && (str[i] <= '9')) {
            num = 1;
        } else if (((str[i] >= 'A') && (str[i] <= 'Z')) || ((str[i] >= 'a') && (str[i] <= 'z'))) {
            alp = 1;
        } else oth = 1;
        i++;
    }

    if ((num==alp) || (oth)) printf("MIXED");
    else if (num) printf("NUMERIC");
    else if (alp) printf("ALPHABETIC");
}

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