Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    int isAlpha = 1;
    int isNumeric = 1;

    for(int i = 0; str[i]!='\0'; i++){
        if((str[i]>='A' && str[i]<='Z') || str[i]>='a' && str[i]<='z'){
            isNumeric = 0;
        }
        else if(str[i]>='0' && str[i]<='9'){
            isAlpha = 0;
        }
        else{
            isNumeric= 0;
            isAlpha = 0;
        }
    }
    if(isAlpha){
        printf("ALPHABETIC");
    }
    else if(isNumeric){
        printf("NUMERIC");
    }
    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