c语言求统计字符个数

int main()
{
    int letter=0,digit=0,other=0;
    char n;
    while((n=getchar())!='&')
    {
        if(isalpha(n))
        {
            ++letter;
        }else if(isdigit(n))
        {
            ++digit;
        }else{
            ++other;
        }
    }
    printf("letter:%d,digit:%d,other:%d\n",letter,digit,other);
    return 0;
}