题解 | #统计字符#

#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main() {
    char str[1001];
    while (fgets(str, sizeof(str), stdin)) {
        size_t len = strlen(str);
        if(len > 0 && str[len - 1] == '\n') {
            str[len - 1] = '\0';
        }
        int alpha = 0, space = 0, digit = 0, punct = 0;
        for(int i = 0; i < len; i++) {
            if(isalpha(str[i])) alpha++;
            else if(isspace(str[i])) space++;
            else if(isdigit(str[i])) digit++;
            else if(ispunct(str[i])) punct++;
        }
        // printf("%s\n", str);
        printf("%d\n%d\n%d\n%d\n",alpha, space, digit, punct);
    }
    return 0;
}