Count Alphabets Digits and Symbols in a String

Code

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

void classify_chars(const char *str, uint8_t *alpha, uint8_t *digit, uint8_t *symbol) {
    int i = 0;
    while(str[i] != '\0'){
    // for(int i=0;i<str_len;i++){
        if(((str[i]>=65) && (str[i]<=90)) || ((str[i]>=97) && (str[i]<=122))){
            (*alpha)++;
        }
        else if((str[i]>=48) && (str[i]<=57)){
            (*digit)++;
        }
        else{
            if(str[i] != 0x20)
            (*symbol)++;
        }
        i++;
    }
}

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++;
    }

    uint8_t alpha = 0, digit = 0, symbol = 0;
    classify_chars(str, &alpha, &digit, &symbol);
    printf("Alphabets = %u\nDigits = %u\nSymbols = %u", alpha, digit, symbol);
    return 0;
}

Solving Approach