这个看看?
#include <stdio.h>
int main()
{
char c;
int letters=0,space=0,digit=0,others=0;
printf("please input some characters\n");
while((c=getchar())!='!')
{
if(c>='a'&&c<='z'||c>='A'&&c<='Z')
letters++;
eles
if(c==' ')
space++;
eles if(c>='0'&&c<='9')
digit++;
else
others++;
}
printf("letters=%d,space=%d,digit=%d,others=%d\n",letters,space,digit,others);
return 0;
}