用指针 统计并输出键盘输入的一行文字中大写字母、小写字母、空格、数字和其它字符的个数

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

int main() {
    char str[100];
    int upper = 0, lower = 0, space = 0, digit = 0, other = 0;
    printf("请输入一行文字：");
    fgets(str, 100, stdin);
    char *p = str;
    while (*p != '\0') {
        if (isupper(*p)) {
            upper++;
        } else if (islower(*p)) {
            lower++;
        } else if (*p == ' ') {
            space++;
        } else if (isdigit(*p)) {
            digit++;
        } else {
            other++;
        }
        p++;
    }
    printf("大写字母：%d\n", upper);
    printf("小写字母：%d\n", lower);
    printf("空格：%d\n", space);
    printf("数字：%d\n", digit);
    printf("其他字符：%d\n", other);
    return 0;
}