题解 | #统计字符#

#include<stdio.h>
#include<string.h>
int main() {
    char str[1001] = {'\0'};
    while (gets(str)) {
        int len = strlen(str);
        int charac = 0, blank = 0, num = 0, other = 0;
        for (int i = len - 1; i >= 0; i--) {
            //字母计数（区分大小写）
            if ((('a' <= str[i])&&(str[i] <= 'z')) || (('A' <= str[i])&&(str[i] <= 'Z'))) charac++;
            else if (str[i] == ' ') blank++;  //空格计数
            else if (('0' <= str[i]) && (str[i] <= '9')) num++;  //数字计数
            else other++;  //其他字符计数
        }
        printf("%d\n%d\n%d\n%d\n", charac, blank, num, other);
    }
}