第一篇

#include<stdio.h>

main()

{

char c;

printf("input a character:");

c=getchar();

if(c<32) printf("This is a control character\n");

else if(c>='0'&&c<='9') printf("This is a digit\n");

     else if(c>='A'&&c<='Z') printf("This is a capital letter\n");

          else if(c>='a'&&c<='z') printf("This is a small letter\n");

               else printf("This is an other character\n");

}