Count Alphabets Digits and Symbols in a String

Code

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

void classify_chars(const char *str, uint8_t *alpha, uint8_t *digit, uint8_t *symbol) {
    // Your logic here
    int str_len = strlen(str);

    for(int i=0; i<str_len;i++){

        if(*str >= 48 && *str <= 57 ){
            (*digit)++;
        }
        else if((*str >= 65 && *str <= 90)||(*str >= 97 && *str <= 122)){
            (*alpha)++;
        }
        else if((*str >= 33 && *str <= 47)||(*str >= 58 && *str <= 64) || (*str >= 91 && *str <= 96) || (*str >= 123 && *str <= 126)){
            (*symbol)++;
        }
        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