Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    // Your logic here
    int num_flag = 0;
    int letter_flag = 0;
    int mixed_flag = 0;
    int i = 0;

    while(str[i] != '\0'){

        if(str[i] >= '0' && str[i] <= '9') num_flag = 1;

        else if((str[i] >= 'a' && str[i] <= 'z') ||
                (str[i] >= 'A' && str[i] <= 'Z')){
                    letter_flag = 1;
                }
        else{
            mixed_flag = 1;
        }

        i++;
    }

    if((num_flag && letter_flag) || mixed_flag) printf("MIXED");

    else if(num_flag) printf("NUMERIC");

    else if(letter_flag) 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