Check if the String Numeric or Alphabetic

Code

#include <stdio.h>
#include <stdint.h>
void classify_string(const char *str) {
    int i=0;
    while(*str!='\0'){
        if(*str>='0' && *str<='9') i|=0x01;
        else if((*str>='A' &&*str<='Z')||(*str>='a' && *str <='z')) i|=0x02;
        else i|=0x03;
        str++;
    }
    if(i == 0x01) printf("NUMERIC");
    else if(i == 0x02) printf("ALPHABETIC");
    else printf("MIXED");
}
int main() {
    char str[101];
    fgets(str, sizeof(str), stdin);
    uint8_t i = 0;
    while (str[i]) {
        if (str[i] == '\n') {
            str[i] = '\0';
            break;
        }
        i++;
    }

    classify_string(str);
    return 0;
}

Solving Approach