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) {
    for(int i=0;*(str + i);i++){
        char ch = *(str + i);
        if(((int) ch >= 65 && (int) ch <= 90) || ((int) ch >= 97 && (int) ch <= 122)){
            *(alpha) += 1;
        }
        else if((int) ch >= 48 && (int) ch <= 57){
            *(digit) += 1;
        }
        else{
            if(ch == ' '){
                continue;
            }
            *(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;
}

Solving Approach