例3-7

#include<stdio.h> int main(void) {  int digit,letter,other;  char ch;

 int i;  digit=letter=other=0;  printf("Enter 10 characters:");  for(i=1;i<=10;i++){   ch=getchar();   if(ch>='a'&&ch<='z'||(ch>='A'&&ch<='Z'))    letter++;   else if(ch>='0'&&ch<='9')    digit++;   else    other++;  }  printf("letter=%d,digit=%d,other=%d\n",letter,digit,other);

 return 0; }