Check if the String Numeric or Alphabetic

Code

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

void classify_string(const char *str) {
    // Your logic here
    int len;
    for(len=0;str[len]!='\0';len++);

    int count=0,alpha=0,num=0;
    int i;
    for(i=0;i<len;i++){
        if(str[i] >= '0' && str[i]<= '9') num++;
        else if((str[i]>= 'a' && str[i]<= 'z') || (str[i]>='A' && str[i]<='Z')) alpha++;

    }

    count = len;
    if(count == 0 ) printf("MIXED");
    else if(alpha == count) printf("ALPHABETIC");
    else if(num == count) 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