#include <stdio.h>
void main()
{
int alphabet=0, space=0, digit=0, others=0;
char ch;
printf("Input a text end of ctrl+z:");
while((ch=getchar())!= EOF)
{
if(ch>='a' && ch<='z' || ch>='A' && ch<='Z')
alphabet++;
else if(ch==' ')
space++;
else if(ch>='1' && ch<='9')
digit++;
else
others++;
}
printf("alphabet=%d, space=%d, digit=%d, others=%d",alphabet, space, digit, others);
}