C语言字符处理

题目要求：

代码实现：

#include<stdio.h>
#include<string.h>
int main(){

    char str[199];
    //scanf("%s", str);scanf更适合用来读单词
    gets_s(str); // 要AC 必须用gets...
    int letter = 0;
    int number = 0;
    int space = 0;
    int other = 0;
    int len = strlen(str);
    for (int i = 0; i < len; i++) {
        if (str[i] >= 'a' && str[i] <= 'z' || str[i] >= 'A' && str[i] <= 'Z') {
            letter++;
        } else if (str[i] >= '0' && str[i] <= '9') {
            number++;
        }
        else if (str[i] == ' ') {
            space++;
        }
        else{
            other++;
        }
    }
    printf("%d %d %d %d", letter,number,space,other);
    return 0;
}