95. Count Alphabets Digits and Symbols in a String

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

void classify_chars(const char *str, uint8_t *alpha, uint8_t *digit, uint8_t *symbol) {
    for(int i = 0; str[i] != '\0'; i++) {
        if (str[i] <= 0x39 && str[i] >= 0x30) *digit += 1;
        else if( (str[i] <= 0x5A && str[i] >= 0x41) || (str[i] <= 0x7A && str[i] >= 0x61)) {
            *alpha += 1;
        } else if (str[i] != 0x20) *symbol += 1;
    }
}

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;
}