Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    // Your logic here
    int i=0,alpha=0,num=0,mixed=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')) alpha=1;
        else mixed=1;
        i++;
    }
    if((alpha==1&&num==1)||mixed==1) printf("MIXED");
    else if (alpha==1) printf("ALPHABETIC");
    else printf("NUMERIC");
}

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