题解 | #统计字符#

插个楼：

#include<stdio.h>
#include<ctype.h>
int main(){
    int alpha=0,space=0,digit=0,other=0;
    char str[1002];
    while(fgets(str,1002,stdin)){
        alpha=0,space=0,digit=0,other=0;
        for(int i=0;str[i]!='\n';i++){
            if(isalpha(str[i]))
                alpha++;
            else if(str[i]==' ')
                space++;
            else if(isdigit(str[i]))
                digit++;
            else
                other++;
        }
    printf("%d\n%d\n%d\n%d\n",alpha,space,digit,other);
    }
}