从用户读取两个字符并进行比较

#include <stdio.h>
int main()
{
   char a,b;
   printf(Which character is greater?\n);
   printf(Type a single character:);
   a=getchar();
   printf(Type another character:);
   b=getchar();
   if(a > b)
   {
      printf('%c' is greater than '%c'!\n,a,b);
   }
   else if (b > a)
   {
      printf('%c' is greater than '%c'!\n,b,a);
   }
   else{
      printf(Next time, don't type the same character twice.);
   }
   return(0);
}