#include<stdio.h>
int main()
{
char ch;
int n=0;
while(scanf("%s",&ch) != EOF)
{ n = 0;
while(ch != '\n')
{
if ((ch>='a')&&(ch<='z'))
n++;
if ((ch>='A')&&(ch<='Z'))
n++;
if ((ch>='0')&&(ch<='9'))
n++;
}
printf("%d\n",n);
}
return 0;
}为什么我这个实现不了求每行的个数