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) {
    while (*str != '\0'){ 
        if ((*str > 64) && (*str < 91) || (*str > 96) && (*str < 123)){ 
            *alpha = *alpha + 1; 
        } else if (*str > 47 && *str < 58){ 
            *digit = *digit + 1; 
        } else if (*str == 32){ 

        } else { 
            *symbol = *symbol + 1; 
        }
        str++; 
    }
}

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