用c编写从键盘输入一行字符分别统计出英文字母和数字字符的个数

#include <stdio.h>
#include <ctype.h>

int main() {
    char str[100];
    int alpha_count = 0, digit_count = 0;
    printf("Please enter a line of characters: ");
    fgets(str, 100, stdin); // 读取一行字符
    for (int i = 0; str[i] != '\0'; i++) {
        if (isalpha(str[i])) { // 判断是否为英文字母
            alpha_count++;
        } else if (isdigit(str[i])) { // 判断是否为数字字符
            digit_count++;
        }
    }
    printf("The number of English letters is %d.\n", alpha_count);
    printf("The number of digits is %d.\n", digit_count);
    return 0;
}