Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
int isnum=0;
int isalpha=0;
int other=0;
while(*str!='\0'){
    if(*str >= '0' && *str <= '9') {
        isnum = 1;
    }
    else if(*str >= 'a' && *str <= 'z' || *str >= 'A' && *str <= 'Z') {
        isalpha = 1;
    }
    else {
        other = 1;
    }
    str++;
}
if (isnum && !isalpha && !other) {printf("NUMERIC");}
else if (isalpha && !isnum && !other) {printf("ALPHABETIC");}
else {printf("MIXED");}

}

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