C.1.1

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

int main() {
    char str[100];
    int letters = 0, digits = 0, spaces = 0, symbols = 0;

    printf("请输入一个字符串：");
    fgets(str, sizeof(str), stdin);

    for (int i = 0; str[i] != '\0'; i++) {
        if (isalpha(str[i])) {
            letters++;
        }
        else if (isdigit(str[i])) {
            digits++; 
        }
        else if (isspace(str[i])) {
            spaces++; 
        }
        else {
            symbols++; 
        }
    }

    printf("字母数量：%d\n", letters);
    printf("数字数量：%d\n", digits);
    printf("空格数量：%d\n", spaces);
    printf("符号数量：%d\n", symbols);

    return 0;
}

//封装
int count(char str[100]){
    int letters = 0, digits = 0, spaces = 0, symbols = 0;

    fgets(str, sizeof(str), stdin);

    for (int i = 0; str[i] != '\0'; i++) {
        if (isalpha(str[i])) {
            letters++;
        }
        else if (isdigit(str[i])) {
            digits++; 
        }
        else if (isspace(str[i])) {
            spaces++; 
        }
        else {
            symbols++; 
        }
    }

    printf("字母数量：%d\n", letters);
    printf("数字数量：%d\n", digits);
    printf("空格数量：%d\n", spaces);
    printf("符号数量：%d\n", symbols);

    return 0;
}